FDA-1B DAC Manual.doc Rev FDA-1B DAC Manual. PCM1794A Full Balance DAC

Transcription

1 F- Manual.doc Rev..0 F- Manual PM794 Full alance ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ High Fidelity 4 bit*9ks/s igital to nalogue onverter ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ esigned y Spencer heung of FTudio.com mail: spencer@fetaudio.com or skcheung68@hotmail.com Page 5-May-0

2 F- Manual.doc Rev..0. Introduction: This F- PM794 is an upgraded version of the obsolete F- Single nded. F- has been developing for.5 years since F- was selling. More than 7 version Ps have been tested before launching to IYers. It has improved all the weaknesses of F- and added additional features and functions to enhance the sonic performance and flexibility of the design. Thus it is a more complete and mature design with separate Front Panel control board, IS input via RJ45 socket and optional SR function via daughter board plug-in! Since it is a IY and thus most of the parts are selected to be through-hole parts except the Is and some film capacitors. In fact most of the film capacitors pad are designed with both SMT (Surface Mount Technology) and TH (Through Hole) pads/holes and thus user can make a change in case better parts is available on hand. In the I/V section, all TH resistors and some filter capacitors are also provided with a SMT pads in case people want to try the SMT parts. For the digital section TH resistor pads can also be soldered with a 0805 SMT resistor due to its pitch is.54mm. Thus this P design is really remarkable and flexible for IYers to experiment with different types of part for sound tuning! For the Front Panel control board, it is mainly SMT parts with TH for Ls and sockets. Thus it provides a good basic training for all IYers for SMT soldering. In fact, SMT parts (with size 0603 and above) are more easy and faster to hand solder than TH parts after managing the skills. What you need is just a 5x magnify glass with stand, small head tweezers, 0.4mm to 0.5mm diameter solder wire and your two stable hands. Major differences between F- and F--IY are:. hange single end design to full balance design in a single board with both balance and single end analogy output.. hange digital receiver chip from S846 to WM8804 which is the best receiver chip with lowest jitter performance and excellence sonic performance. 3. ll mirror image P layout for analogy regulators, and IV sections to gain maximum sonic performance in 3 sound stage. 4. Improve P layout in all sections to achieve lowest noise level and super accurate timing for on board digital signal paths. 5. separate front control board is provided for the digital input select control and L indication of input and working status. Memory is provided for the input selection even after power off. 6. dd two daughter board options: One for the 4 th digital IS input via RJ45 socket and the other SR options using 896 or SR49 chips. S84 has been tested but rejected due to its harsh sonic performance. 7. Future expansion to US input using new chipset like XMOS solution is possible via the input daughter board using the 4 th IS digital input. In fact, the XMOS reference design has been tested successfully via the IS input at J5. Page 5-May-0

3 F- Manual.doc Rev..0 Major sonic improvement:. More eef in the sound.. Improve overall resolution and details. 3. Quieter music background. 4. Much refine sound stage, and super 3 position. 5. More relax and musical sound. With the above improvements, it is hardly can find a branded or IY that can produce music close to F- no matter what the price is. omponent choices:. Many Toshiba obsolete parts are eliminated and better parts are selected from various sources to ensure continue supply. Many Fairchild transistors are used for the better specifications and easily available from Mouser or igikey.. Use 50ppm/K through-hole resistors rather than the 00ppm dale resistor. Thus Vishay MRS5 and Xicon 50ppm % resistors are widely used. 3. Maintain the use of lna Silmic II capacitors in the analogy sections for its best sonic performance. 4. Use more SMT capacitors (both -cap and ML) in the digital section as they perform better and with lower SR. xample is OS-con SVP or Panasonic FK series. The 6800p and 500p low pass filter capacitors have changed to SMT type for more accurate and stable performance. 5. ROHS compliance is the first choice for all components. Page 3 5-May-0

4 F- Manual.doc Rev..0. Specifications:. chips: Texas Instruments PM794 x pieces 4bit/9k best in class operating in mono mode for best dynamic performance up to 3 db.. igital Receiver: Wolfson WM8804 4bit/9k digital receiver. est sound receiver chip ever made. 3. I/V and nalogy Filter: iscrete power transistor I/V (current steering) operating in pure lass mode with NO global feedback. ka Pass I/V topology. 4. igital Input: SPIF, S, Toslink and IS us (R, XLR female, Toslink and 5x-pin header daughter board is required for IS input via RJ45 socket). 5. it/sampling Frequency: Up to 4bit/9k. 6. SR options are provided with additional cost: Two choices 896 or SR49 can be provided. 896 will be at max 96k Fs and SR49 can be at max 9k Fs. 7. nalogy Output: Stereo hannels Single and Full alance at 3Vrms via R and XLR male connectors. 8. Output Impedance: 50 ohm Single nd mode; 300 ohm Full alance mode 9. Output auto muting using relays. 0. Power supply: 8V x, and 8~9V x, ; total consumption around 50m per input or around 4W/oard.. isplay Ls: Power/Mute, Lock, and igital Input Selection.. istortion: Maximum 0.0%, khz at 0dbFS, 3Vrms. Typically at 0.00% or below at -0dbFS input level. 3. oard: x 8 inches double sided.6mm gold plated FR4; x supporting holes; max height part 35mm. Total board height is 37mm. Page 4 5-May-0

5 F- Manual.doc Rev..0. ssembly Instruction. Please take necessary S precautions, as all the parts are S sensitive!. Solder all SM I: PM794 x, 74VH44 x, WM8804 x, MS7-3v3 x 5, 74H00 x, 74H0 x and 74H38 x etc... lign the markings of the I with the text on the P screen-printing. 3. Solder all SM chip capacitors provided as per below sequence. They are 5pF x, 470p x, u x, 0.047u x (06), 500p x 4, 6800p x 8, 0.0u x 4, 0.u x Solder the crystal MHz Y. 5. fter that wash the P to remove all the flux with Isopropyl lcohol. Use a tooth brush to clean the gap of the Is leads. fter that rinse the P with distill water and dry it properly. 6. Use a multi meter to check all the leads of PM794 and WM8804 connections. nsure no adjacent leads are shorted together unless it is designed to be shorted. *** If you buy the kit, you will get a main board with all the SMT parts presoldered as above *** Page 5 5-May-0

6 F- Manual.doc Rev Solder the rest of the parts starting from the smallest parts first, preferably also by component type. For example, resistors, chokes, beads, diodes, -caps etc For SM -capacitors (OS-con), pull the leads straight and insert into the P holes before soldering. o not pull the lead too hard as it may break. Page 6 5-May-0

7 F- Manual.doc Rev There are some parts that need special attentions during assembly: 8.. Transistors 85 x 8 pcs - Q3, Q3, Q33, Q34, Q35, Q36, Q84, & Q97: The pads are not properly designed and thus these parts must be inserted as per the photos below. The orientation should not follow the marking on the P. See below photos of all the 8 pieces 85 transistor orientation. Page 7 5-May-0

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10 F- Manual.doc Rev iodes N4007 x 4 pcs 34, 35, 36, & 37: The cathode mark (strip or K) is not provided on the P, it is actually the big white circle on the P onnectors J, J3, J8, J6, J4, J6, J5, J, J55, J59, & J58 refer to photo for the type of pin header or socket in case the description on the OM is confusing o not connect the 6 wires at J8, J9, J0 and J. Refer to the tuning procedure for details. Page 0 5-May-0

11 F- Manual.doc Rev IRF960 x, IRF60 x, and L7T x, PNP and NPN Transistors are installed on all heatsink with their marking all facing upward as shown below. Note that there is a mica insulation sheet between the body of TO-0 parts and the heat sink only. The transistors do not need a mica sheet for insulation R39, R69 and R7 are jumpers and not provided. Use an excess component lead to short solder the two pads. Page 5-May-0

12 F- Manual.doc Rev igital Input Select Switching Noise fix: If you switch the digital input from IS to SPIF (R), sometimes you may hear some static noise from the speaker. The cause is due to the WM8804 slow response to lock on a SPIF signal. The fix is to increase the mute time of the output relays and a capacitor 63 of 0u to u will be soldered to the collector and mitter (ground) of Q33 as show in the photo below. Page 5-May-0

13 F- Manual.doc Rev IS board should be installed as show in below photo. Note that the x pin header should be plug into J4 of main board below. Page 3 5-May-0

14 F- Manual.doc Rev If you buy the SR option, the output sample frequency Fs will be as below: SR hip J5 J6 Sample Frequency SR49 Open Open 96k SR49 Open Short 48k SR49 Short Open 9k SR49 Short Short No Output 896 Open Open 96k 896 Open Short 48k 896 Short Open 3k 896 Short Short No Output Page 4 5-May-0

15 F- Manual.doc Rev..0. Tuning Procedures:. With all the parts in place except the 6 wires provided.. onnect 8V (or a regulated power supply with current limit set to 300m at Vdc) to J55 (do not connect J58 and J59 to 8V), check the voltages at U6 and U7 (L7T) body heat-sink (not the big heat-sink that it attached to) relative to ground (GN at U8 daughter board position or GN at the middle of the two 5600u big filter capacitors). The voltage should be at about 5V /- 0.5Vdc. If the voltage is much more than 5V (6V or above), cut off the power immediately to prevent damage to the expensive PM794 chips. 3. Then check the voltage at U8, U9, U0, U6, & U7 (MS7-3.3). The voltage at the little heat-sink of the regulators should be 3.3V /- 0.Vdc. 4. Plug in the Remote ontrol oard via J on both Ps. (US/IS) and 5 should be ON. Press the toggle switch (at J or J4) to see if the Ls to 4 is ON one by one. The sequence is from and repeat. lso hear if the relays K3, K4 and K5 have clicking sounds when pressing the toggle switch. 5. Inject a digital SPIF signal to J4 R socket, the LOK L (6) should be ON if SPIF (4) is selected. This shows that the digital section is working properly. 6. Then remove the power at J onnect 8V (or a regulated power supply with current limit set to 300m at 4Vdc) to J59, check for voltage at J8 and J for -0V to G points. The initial voltage should be around -5.5V. djust VR4 and VR8 until the voltage is -0V /- 0.0Vdc. Remove the power applied to J onnect 8V (or a regulated power supply with current limit set to 300m at 4Vdc) to J58, check at J8 and J for 0V to G points. The initial voltage should be around 5.5V. djust VR3 and VR7 until the voltage is 0V /- 0.0Vdc. Remove the power applied to J Solder the 6 wires provided from J8 to J9 and J to J0. Make sure that the wires are connected from -0V to -0V, G to G and 0V to 0V points. Note that there is crossover of wires on one side. 0. onnect power to all J55, J59 and J58.. heck the 0V and -0V are still at about the same voltages as before. If not, the IV section is shorted somewhere.. Output offset adjustment: 3. heck the offset voltage at 46 (83) inner hole relative to G of J57. It should be around 0.45Vdc. djust VR until this voltage to below mv. Repeat at 47 (84) and adjust VR to nearest 0V offset. 4. heck the offset voltage at 48 (7) inner hole relative to G or J60. It should be around 0.45Vdc. djust VR5 until this voltage to below mv. Repeat at 49 (9) and adjust VR6 to nearest 0V offset. 5. fter warm up for 30 minutes, repeat above two steps to ensure the offset is below mv by adjustment again if necessary. For normal use, the offset of /-5mV is ok as all output has couple capacitor to block any from going to the next stage. 6. If all the adjustment is done, proceed to measurement. 7. onnect a khz digital signal to the SPIF input (R socket). test recorded with khz can be used with a player with SPIF output. Page 5 5-May-0

16 F- Manual.doc Rev heck the output levels for 0dFS input signal is at about.5vrms at R and 3Vrms at XLR output sockets. Left and right channel should not be more than 0.5d differences in levels. 9. heck that the distortion of the output KHz signal is below 0.0% for both channels. 0. urn-in the for about ½ hour to stabilize the parts. Page 6 5-May-0

17 F- Manual.doc Rev..0. oard Interface Specifications:. Power Supply onnectors: Location escription Format J58 8V to 0V,, 0V 3.96mm pitch J59 8V to 0V,, 0V 3.96mm pitch J55 8 to 9V,.5, 0V 3.96mm pitch J/J5/J54 hassis Ground onnect GN to star ground point. J5: xternal igital onnector: (5 x Pin Header; pitch.54mm, MOS 3V3 logic) Symbol escription Pin Marking on P GN igital Ground GN MLK System clock 56fs MLK GN igital Ground 3 GN S Serial igital ata 4 S GN igital Ground 5 GN LK it clock 64fs 6 K Reset Power up reset 7 RST LRLK Work clock fs 8 LRK Mute Output Mute (Hi = Mute) 9 Mute 5V 5V Supply for plugin 0 5V 3. igital Input Socket: Location escription Spec Format J4 SPIF input 75 ohm 4bit/9k R (Yellow) J3 S input 0 ohm 4bit/9k XLR female U3 Optical input Optical 4bit/9k Toslink J5 IS, Mute & Reset 3.3V MOS 5x pin header 4. nalogy Output Socket: Location escription Format J7 Left Single nd Output R (white) J4 Left alance Output XLR Male J6 Right Single nd Output R (red) J5 Right alance Output XLR Male 5. Front Panel ontrol oard (V7.): Location escription J onnect to main board J via a 0-pin flat cable J & J4 Use a Push type Toggle Switch without latch. Switch is normal open, onnect one of them for digital input selection J0 Power L optional for additional Power display R8 onnect 3v3 to 5 Power indicator, then R8 must be opened R8 onnect Mute to 5 Input Mute indicator, then R8 must be opened R5/R6 R5 short and R6 open count down, R5 open and R6 short count up this will change the switching direction of the digital input selection Page 7 5-May-0

18 F- Manual.doc Rev Front Panel ontrol oard L isplay: Location escription ON = Select IS/US input (J5) ON = Select Toslink (Optical) 3 ON = Select S (XLR female) 4 ON = Select SPIF (R) 5 Mute or Power indication (R8 = Open & R8 = 0R Mute; R8 = 0R & R8 = Open Power) 6 Lock ( ON = WM8804 is locked to digital input signal) 7 US/IS; either US or IS plug-in is activated 8 US; reserve for US lock indicator 7. Main P Options: Location escription R69/R70 R69 short & R70 open use 5V relay; R69 open & R70 short use 3v3 relay for K3, K4 & K5; default is R69 short and use 5V relays. R7 If short, then the IS mute is not functioning, i.e. analogy output NO- Mute; default is Mute. R7/R73 If R7 short & R73 open Mute is using LOK signal; if R7 open & R73 short Mute is using Gen rror signal. efault is LOK signal L If populated, use 3V3 Optical receiver but L4 must not used (efault) L4 If populated, use 5V Optical receiver but L must be removed J Same as J3, S input J3 Same as J4, SPIF input J6 Same as U3, Toslink input J8 SPIF output for WM8804, need to connect to a external R socket JMP If connected, the hole next to it will be connected to analogy ground 95/96/97 an be used to connect a MOV for surge suppression, not provided H0 to H06 Output couple capacitor connection points for large film capacitor. Two groups of pads are provided. xample: H0 & H0 are the same points, and H03 & H04 are the same points. Thus connect a film capacitor from H0 to H03 and/or H0 to H04. Other connections are {H05 to H08, H06 to H07}; {H09 to H0, H00 to H0}; {H03 to H05, H04 to H06}. 9 to 3 Optional filtering capacitors for IV, not provided U8 NOS daughter board will be provide as the default option. SR daughter board using 896 or SR49 can be purchased separately to plug into same location. The output sampling frequency from the SR is preset to either 96k for 896 or 9k for SR49. T Not used and not provided J57 Left hannel nalogy Output: T = ve, T = -ve, G = Ground. This is for external R and XLR socket connection. J60 Right hannel nalogy Output: T = ve, T = -ve, G = Ground. This is for external R and XLR socket connection. Page 8 5-May-0

19 F- Manual.doc Rev..0 ttachments:. ircuit iagram pages. F- OM pages 3. FFT measurement pages 4. Ps mounting dimension 6 pages ~ ~ ~ N ~ ~ ~ Page 9 5-May-0

20 LI Input from PM R95 R6 R7 R R /W 0k R p 50V R3 R p 50V R9 475R /W R35 KS0YS 4R7 4R7 Q H8 KS690YS Q3 R3 R43 56R R4 R T85S N4736 3k3 R6 R4 R44 KS0YS Q 56R R5 H5 GN KS690YS Q4 R3 R3 0R /W 3k3 R7 W 500R 0T VR H6 KS690YS KS690YS Q6 Q5 iscrete IV Left -V R36 3k3 R8 9 u 50V R5 R6 RWN: HK: <hecked y> QULITY ONTROL: RLS: 6 k R0 R07 k R R u 35V GN Q7 Spencer <Q y> Spencer heung KS0YS 8R5 R9 KS0YS Q8 8R5 R 00u 35V 5 H7 R83 49R9 /W T: T: <hecked ate> T: <Q ate> T: R4 R5 50R /W HO R87 HO3 J9-3 J9-3 J9- OMPNY: TITL: WM5 LTR RVISION ROR O NO: F- (PM794 ) F--5 SL: SHT: OF PPROV: T: O: SIZ: RWING NO: RV: : 8 00u 35V u 35V p 50V GN -0VLL GN 0VLL 46 0.u 50V HO6 HO5 R79 00k R70 OUT_LFT LI- OUT_LFT- P P4 P5 P6 P3 P XLR-ML J4 J7 S 4 G SG S3 6 3 HS S 5 R_JF J57 S 4 G SG S3 6 3 HS S 5 R_JF 0 5

21 RI Input from PM794 RI R97 R33 R34 R R /W 0k 9 R8 R0 36 R9 6800p 50V R p 50V 475R /W R37 KS0YS 4R7 4R7 KS690YS Q9 Q5 H R5 R45 56R R 3 R T85S 4 N4736 3k3 R3 R6 R46 KS0YS Q6 56R R KS690YS Q0 H9 GN R3 R30 0R /W 3k3 R4 VR W 500R 0T H0 KS690YS KS690YS Q Q iscrete IV Left V R38 3k3 R5 30 u 50V 4 GN 0 R7 R8 RWN: HK: <hecked y> QULITY ONTROL: RLS: 3 k R7 R09 k R9 R0 00u 35V GN Q3 Spencer <Q y> Spencer heung KS0YS KS0YS 50R /W R3 Q4 8R5 R8 00u 35V H 8R5 R84 R6 R3 49R9 /W T: T: <hecked ate> T: <Q ate> T: HO HO9 R88 0 OMPNY: TITL: 8 00u 35V 85 LTR RVISION ROR O NO: SL: SHT: OF PPROV: T: O: SIZ: RWING NO: RV: WM5 : p 50V 00u 35V GN GN GN -0VLL GN 0VLL 47 0.u 50V F- (PM794 ) R80 HO 00k R7 GN HO OUT_LFT F

22 LI Input from PM794 LI- 5 8 R99 R R3 R R /W 09 0k R p 50V R99 R p 50V R93 475R /W R39 KS0YS 4R7 4R7 H3 KS690YS Q43 Q49 R7 R47 56R R00 6 R T85S 7 N4736 3k3 R0 R8 R48 KS0YS Q50 56R R0 KS690YS Q44 H4 R33 GNR R09 0R /W 3k3 R03 KS690YS KS690YS Q45 Q46 iscrete IV Right -V W 500R 0T VR5 H4 R40 3k3 R04 3 u 50V 5 GNR RWN: 3 R9 R0 HK: <hecked y> QULITY ONTROL: RLS: 4 k R06 R k R08 R 00u 35V Spencer <Q y> Spencer heung KS0YS Q47 8R5 R05 KS0YS Q48 8R5 R07 00u 35V 3 H5 R85 R0 49R9 /W 50R /W T: T: <hecked ate> T: <Q ate> T: R HO6 R89 HO5 OMPNY: TITL: J0-3 J0- J0- LTR RVISION ROR O NO: PPROV: F- (PM794 ) T: O: SIZ: RWING NO: RV: WM5 F--5 5 : 6 00u 35V 0 0VRR 0.u 50V u 35V p 50V GNR -0VRR 48 00k R4 SL: SHT: OF R8 HO7 HO8 OUT_RIGHT OUT_RIGHT- GNR 3 P P4 P5 P6 P3 P XLR-ML J5 J6 S 4 G SG S3 6 3 HS S 5 R_JF J60 G S 4 SG S3 6 3 HS S 5 R_JF 0

23 RI Input from PM794 RI R0 R30 R3 R0 475R /W R p 50V R94 KS0YS 4R7 4R7 KS690YS Q5 Q57 H9 R9 R49 56R R8 8 R k R7 R6 475R /W T85S 9 N4736 3k3 R0 R30 R50 Q58 56R R9 44 KS0YS KS690YS Q5 H7 R34 R7 0R /W p 50V GNR R4 3k3 R VR6 KS690YS KS690YS Q53 Q54 iscrete IV Right V W 500R 0T H8 R4 3 u 50V 3k3 R 5 7 GNR RWN: HK: 4 R R 6 Spencer <hecked y> QULITY ONTROL: k R4 R3 k R6 R4 4 00u 35V <Q y> KS0YS Q55 8R5 R3 50R /W KS0YS R9 Q56 8R5 R5 00u 35V 5 H6 R86 R8 49R9 /W T: T: <hecked ate> T: <Q ate> HO HO R90 3 OMPNY: TITL: -0VRR 8 00u 35V 3 0VRR LTR RVISION ROR O NO: PPROV: T: O: SIZ: RWING NO: RV: WM5 0.u 50V F- (PM794 ) 00u 35V 500p 50V GNR 49 R8 HO4 00k R3 GNR HO3 OUT_RIGHT F--5 5 RLS: Spencer heung T: : SL: SHT: OF 4 0

24 LRKO STO LKO MKO MUT_MS_ RST IS uffer xt. IS _MLK _S _LK _LRK GN J5- GN 5x pin header J5-9 O O J5-3 J5-4 U5- U5-8 9 J5-5 9 Y0 7 Y 5 Y 3 Y3 74VH44M 8 Y0 6 Y 4 Y Y3 74VH44M J5-6 U3-74H0 J V R57 R58 R59 R60 J5-8 R97 IS J5-9 J5-0 R84 47k GN u 50V 5 47u 6.3V 6 0.0u 5V 846 IS Left hannel U MONO HSL 3 M 4 LRK 5 T 6 K 7 SK 8 GN 9 V 0 MUT FMT0 FMT 3 ZRO 4 RST_ R35 R55 R56 5VRG RST I_LRLK I_LK I_ST I_MLK GN PM794 FMT0/FMT = O/O = IS 7 47u 6.3V 8 0.0u 5V 9 47u 6.3V 0 0.0u 5V IS Input and Select control R7 U3-74H0 3 5V O U- 8 Y0 6 Y 4 Y Y3 74VH44M 9 O U- 9 Y0 7 Y 5 Y 3 Y3 74VH44M 5VLLT ead MLK LK S LRLK L ead L 3 47u 6.3V 47u 6.3V 47u 6.3V ead L R93 R94 R95 R96 RWN: HK: <hecked y> QULITY ONTROL: RLS: GN R35 0k GN Spencer <Q y> Spencer heung GN "High = Mute" T: T: <hecked ate> T: <Q ate> T: _MUT 4 0.u 50V IS I_MUT OMPNY: TITL: 8 VL 7 GN3L 6 IOUTL- 5 IOUTL 4 GN 3 V VOM VOM 0 IRF 9 GN 8 IOUTR- 7 IOUTR 6 GN3R 5 VR LI LI- RI RI- LTR To IV Left h Mute control circuit R90 47k RVISION ROR O NO: PPROV: T: O: SIZ: RWING NO: RV: WM5 F--5 5 : 9 0 U4- MUT_MS_ H00 MLK ST LK LRLK 3.3V 3 U4-74H00 U4-74H00 F- (PM794 ) SL: SHT: OF U3-74H0 U3-74H0 U4-74H00 MUT_ R64 680R LOKO R76 680R 0 LOK IMUT

25 V ead L u 6.3V 00 0.u 50V GN LRLK S LK MLK MUT_MS_ RST 5VRG IMUT LRLK LK ST MLK 43 U6 4 3 IN OUT G NOS or SR MOUL GN MS7-3.3 U8 5VRG GN 4 GN RST 3 3 IMUT MUTO 4 ILRK LRKO 5 ISLK SLKO 0 6 IST STO 9 7 IMK MKO 8 S84_SR 3.3V u 50V 9 47u 6.3V 9 0.0u 5V R79 47k 3.3V GN RST Right hannel U MONO HSL 3 M 4 LRK 5 T 6 K 7 SK 8 GN 9 V 0 MUT FMT0 FMT 3 ZRO 4 RST_ PM794 8 VL 7 GN3L 6 IOUTL- 5 IOUTL 4 GN 3 V VOM VOM 0 IRF 9 GN 8 IOUTR- 7 IOUTR 6 GN3R 5 VR FMT0/FMT = O/O = IS MUT_MS_ R54 R53 R5 R5 5V LRKO LKO STO 5VRLT ead L u 6.3V RWN: u 5V 00 47u 6.3V 0 0.0u 5V HK: 07 0 Spencer <hecked y> QULITY ONTROL: ead L0 <Q y> u 6.3V 47u 6.3V 47u 6.3V ead L3 R44 0k T: T: <hecked ate> T: <Q ate> OMPNY: TITL: 05 0.u 50V MKO GNR GNR GN LTR RVISION ROR O NO: PPROV: T: O: SIZ: RWING NO: RV: WM5 LI LI- RI RI- To IV Right h F- (PM794 ) F--5 5 RLS: Spencer heung T: : SL: SHT: OF 6 0

26 LOK PWROFFTL VL GN -VL R83 4k7 V V K K 0k R74 G 5 55 L36-5V 6 G 56 L36-5V R8 0k Q3 85 S S Q5 Q89 K30 S S R6 00R R6 00R u 5V u 5V Q6 Q90 K pF R55 680R R56 680R 0k R73 0u Q GN Low Noise Super Regulator - Left 5 0u 54 0u 6 0.u 50V R7 4k7 Q39 Q7 KS99F Q30 KS845F Q74 0VL R5 G G R86 475R N448 S S S S Q4 Q4 Q4 KS99FQ3 KS99F KS845F Q Q Q38 Q37 KS845F Q3 85 GN RL Q9 Q9 R63 Q0 Q9 R u 50V R34 4k7 K30 00R K30 0VLL Q40 Q8 KS99F 00R Q9 KS845F Q59 R5 30 R33 475R N448 Q36 85 RR RR- RR- W W W--50LF VR3 R45 4k7 4k7 R46 VR4 0VRR Output Muting kt RWN: 49 0u 50 HK: <hecked y> QULITY ONTROL: RLS: 0u 396W--50LF R47 5k R48 5k Spencer <Q y> Spencer heung R77 00R R78 00R T: T: <hecked ate> T: <Q ate> T: R4 47k 47k R4 G G S u 35V 0.u 50V u 35V 0.u 50V 8 S H H IRF960 Q8 Q7 IRF60 OMPNY: GNR TITL: GN GN LTR RVISION ROR O NO: PPROV: T: O: SIZ: RWING NO: RV: WM5 F--5 5 : J8- J8- J8-3 0VL GN -0VL Mute Relays F- (PM794 ) SL: SHT: OF RL OUT_LFT RR OUT_RIGHT OUT_LFT- RL- RL- OUT_RIGHT K -V GN K -V GNR

27 GN VR -VR 4 0.u 50V 4 0.u 50V smt pts U FIUIL_5_30 U9 FIUIL_5_30 U0 FIUIL_5_30 U FIUIL_5_30 V V K K G 3 5 L36-5V G L36-5V S S R65 00R S R66 S 00R J9 J39 J46 Q6 Q93 K u 5V u 5V Q64 Q94 K30 R4 680R R43 680R Screw Holes x 7 J30 J40 J3 J3 Heatsink air holes J47 J4 J48 J4 J49 Low Noise Super Regulator - Right 50 0u 5 0u J33 J43 J50 J34 J44 J5 Q75 Q67 KS99F Q60 Q79 KS845F Q73 KS845F Q8 GN J35 J45 J5 J36 J53 M_50MIL M_50MIL M_50MIL M_50MIL M_50MIL M_50MIL M_50MIL M_50MIL G G S S S S Q78 Q70 Q77 KS99FQ69 KS99F J37 J38 K30 Q65 Q95 R67 K30 Q66 Q96 R68 Q76 Q68 KS99F Q7 Q80 KS845F 00R 00R Q7 KS845F Q8 W W RWN: HK: VR7 Spencer <hecked y> QULITY ONTROL: RLS: 396W--50LF R38 4k7 4k7 R39 VR8 48 0u 49 0u 396W--50LF <Q y> Spencer heung R40 5k R4 5k R44 00R R45 00R T: T: <hecked ate> T: <Q ate> T: G R36 47k 47k R37 G u 35V 0.u 50V u 35V 0.u 50V 6 OMPNY: J56 J63 GN J64 TITL: O: F- (PM794 ) SIZ: RWING NO: WM5 F--5 SL: S 3 S H H IRF960 Q63 Q6 IRF60 GN GN LTR J- J- GN J-3 0VR -0VR RVISION ROR O NO: PPROV: : SHT: 8OF 0 T: RV: 5

28 J3- J3- J3-3 J3-4 S XLR (,0) SPIF R (,) J4 4 S G 6 S3 SG HS 3 5 S R_JF J3- J3- Set dafault to R (,) To FP 3.3V J- J- J-3 J-4 J-5 J-6 J-7 J-8 J-9 36 J u 50V GN 64 0.u 50V R65 47k T 5698-LF LF3 R67 47k T J- J- J R39 0R 3 4 US R46 0R R47 0R 69 0.u 50V 76 US LOKO u 5V 75R R48 MUT_ J4- J u 5V R R J6- J u 50V US 78 TOSLINK INPUT (0,) RIN U3 TORX47 OUTPUT GN 3 V U4 5 Y0 4 Y 3 Y Y3 Y4 0 Y5 9 Y6 7 Y7 74H38 _SL0 _SL US 3.3V XLRIN 5VRG 3.3V Relay Select 5V RLY 3V RLY Mute Select rr Lock Logic power decouple R8 0R 0.u 50V u 5V R80 47k u 50V 0.u 50V 0.u 50V 0.u 50V GN VRLY I_MUT J6- J6- J6-3 GN R69 0R R70 IS TOS XLR R R50 R73 R7 0R 0.u 50V GN TOSIN 87 0u V V 0k V R49 L 47uH 47k R53 P VRLY 0k R u R u 50V XLR TOS 0k R40 RST PV RST R54 0k 680R R88 680R R89 GN 680R RWN: HK: <hecked y> QULITY ONTROL: RLS: Q35 85 SLK RX0 0 GPO0/SWIFMO V 9 3 SIN/HWMO GN 8 4 SOUT/GPO TXO 7 5 S/GPO MLK 6 6 RST LRLK 5 7 PV LK 4 8 PGN IN 3 9 LKOUT U OUT 0 XOP WM8804 XIN Y Spencer <Q y> Spencer heung 5 5 Q Q84 85 Y 9 MHz SMT 5p 50V N448 N448 N T: T: <hecked ate> T: <Q ate> T: p 50V OMPNY: TITL: K3 HX-5V K4 HX-5V K5 HX-5V TXO R36 LTR RVISION ROR O NO: PPROV: F- (PM794 ) SL: SHT: OF T: O: SIZ: RWING NO: RV: WM5 : R37 R38 R63 ead RIN XLRIN 5VRG TOSIN V L5 3 47u I_MLK I_LRLK I_LK I_ST 8804 Supply u 50V GN 66 U7 LT7 4 3 IN OUT G u 50V 0.0u 5V TXO 6 00u PV u 50V 47u 0.u 50V R57 0R 0R F--5 ead 9 L u 50V R58 SPIF Out GN 0.u 50V 0 6 u 6.3V J8- J8-5

29 5V V V H3 5VRG 5VRG L8 H L9 mh ead mh L8 ead L6 ead 60 47u 6.3V 0 470u 36 N4007 L7T 3 IN U7 OUT J 88 L IN OUT 56 G 65 MS u 50V u 0.u 50V 0u 300R R49 GN GN GN 99 0.u 50V GN U9 U8 93 G 70 MS u 50V 37 N4007 L7T 3 IN OUT u 50V U6 J 7 0u GN U0 4 3 IN OUT 4 3 IN OUT G MS N4007 R50 N R R66 00R R6 300R u Logic Regulator 64 00u u 50V 8804 Regulator 69 00u L3 0.u 50V 794 3v3 Regulator 3.3V igital Pre-regulator u 50V 0.u 50V u ead J9- J0- J0- J- J v Regulator u 50V 00u 35V 3.3V 5VRG 9 9 8V 95 0.u 50V J9- J58- J58- J59- J59- V J55- J55-8V 8V 8V 9V 9V 88 0.u 50V 50 F Fast k 0.u 50V F Fast k 0.u 50V F3 Fast k 0.u 50V L4 5VRG 7 SYV SYV SYV SYV7-00 PWROFFTL SYV7-00 SYV SYV SYV SYV SYV SYV SYV7-00 R6 0k 0 N448 Power down control RWN: HK: <hecked y> QULITY ONTROL: RLS: u50V u50V 5 Spencer <Q y> Spencer heung nalogy Supply 470u u 35V 35V u 35V 35V igital Supply R59 4k7 T: T: <hecked ate> T: <Q ate> T: R60 0k R68 0k R69 0k SYV pF 5 50 L7 mh L mh OMPNY: TITL: L mh L3 mh u 6V 6V 5V 5VRG P Q WM5 : V GN 73 0.u 50V 74 0.u 50V VL VR -VL -VR R87 4k7 LTR RVISION ROR O NO: PPROV: F- (PM794 ) T: O: SIZ: RWING NO: RV: GN J54 J5 J GN Ground Via Reset control Ground ead Shield Holes F--5 5 SL: SHT: OF 53 J8 J7 G GN_PT GN 0 ead ead R75 47k 77 GN 0u L0 L9 L GN 0 RST J J3 J6 J7 J6 GN 3.3V

30 To Main board 3V3 Power L 3 J0- J0- J- J- J-3 J-4 J-5 J-6 J-7 J-8 J-9 J-0 J3 GN 7 J4 R7 00u J5 R8 R8 0R 3 0.u 50V Mute/Power Holes x 8 J6 K 4 O_MUT 5 0.u 50V J7 47k R Standby = Hi K LOK 5 LK 6 0.u 50V J8 48K K IS/US 7 0.u 50V J9 LOT K US u U/ J0 LK 0.u 50V L Indicator GN 3V3 J- J- Input Sel SW J4- J4- GN L 5 U/ R7 4 3 T RO M/M 4 LK Q0 Q 0 6 Q Q3 GN 74H9 SMT Mark U5 U4 FIUIL_5_30 U6 FIUIL_5_30 U7 FIUIL_5_30 U8 FIUIL_5_30 LOT 3V3 U3 N V 8 0 Q0 7 3 Q 6 4 VSS LK 5 FM06 47k R6 LK R9 47k 8 u GN 3 4 G 5 G 6 G RWN: HK: Spencer <hecked y> QULITY ONTROL: RLS: U Y0 Y Y Y3 Y4 Y5 Y6 Y7 74H efault = own <Q y> <Released y> 9 7 R5 680R R6 R 680R R3 680R R4 680R R5 680R T: 3-Feb-0 T: <hecked ate> T: <Q ate> T: INPUT SLT LS US/IS K OPT K <Release ate> OMPNY: TITL: SL: XLR K 3 O: 794 R K U- 4 74H4 U H4 U LK 3V3 U/ GN 74H4 LK P- Front Panel, SR & NOS SIZ: LTR U H4 U- 0 74H4 U-F 3 74H4 RVISION ROR O NO: LK LK RWING NO: 794-FP PPROV: Lo to Hi clk Hi to Lo clk <Scale> SHT: OF 3 T: RV: 6

31 J3 J- J- J-3 J-4 J-5 J-6 J-7 NOS oard Pin Header 7 x GN RWN: J- J- J-3 J-4 J-5 J-6 J-7 HK: Spencer <hecked y> QULITY ONTROL: RLS: <Q y> <Released y> T: 3-Feb-0 T: <hecked ate> T: <Q ate> T: <Release ate> OMPNY: TITL: P- Front Panel, SR & NOS O: SIZ: RWING NO: RV: FP 6 SL: RVISION ROR LTR O NO: PPROV: T: <Scale> SHT: OF 3

32 Item Reference Value Qty P L F- main board Q- Q7-8 Q3-6 Q47-50 Q55-58 KS0YS 6 TO--8H 4 Q3-6 Q9- Q43-46 Q5-54 KS690YS 6 TO--8H 6 T 5698-LF3 pulse trans 5698-LF3 7 T 5698-LF3 8 U4 74H00 SO4 9 U3 74H0 SO4 0 U4 74H38 SO6N U U5 74VH44M SO0W Q37-38 Q59 Q74 Q79-8 KS845F 8 TO-9 3 Q39-4 Q75-78 KS99F 8 TO YV O u 5V S K u 50V S K p 50V S p 50V S 6 u 6.3V K pF 50V S p 50V S 5 50 K u50V u 6V SU X-P0X5MM u 6.3V OS-con u 35V Silmic II P--5X0MM * (* solder on bottom, refer to manual) u 35V F u 5V F 4 P-3X8MM u 6V F 4 P-3X8MM u 6.3V OS-con u 6.3V Silmic II 4 P-3X8MM u 35V udio X-P0X5MM FR04R- 48 J x5 Male H H-0V 49 J8 J4 J6 x female H 3 SIP-P 50 J3 x male H SIP-P 5 J55 J58-59 x3.96mm male onnetor 3 ON_P 53 J J6 3x male H SIP-3P 54 J8-6 x 50mm on Wire 6 ON_P3_ U8 SR Module board I 7-pin socket M F 4 S84_SR N R/8W 57 0 N448 O_MINI N448 5 IO_V T85S or S85 4 MLL34 6 F-3 T type 3 FUS-5MM 64 J5 x5 female H HR0 65 H4 H6 H8 H0 H-3 H8-9 0x5xmm Heat sink 8 HTSINK_MINI 66 H5 H9 H4 H7 6x4xmm Heat sink 4 HS_900_635MIL 67 H7 H H5-6 6x4x30mm lack Heat sink 4 HS_900_635MIL 68 H-3 H0-6x6x5mm lack Heat sink 6 HTSINK_630X630X00 0MIL 70 L9 L8 mh 500m Inductor IN-R-5MM 7 L 47uH 00m IN-MOL_400MIL 7 L3-8 L0-7 L-3 ead 7 IN-MOL_400MIL 73 L9-0 ead IN-MOL_300MIL 74 L IN-MOL_400MIL 75 L4 IN-MOL_400MIL 76 Q7 Q6 IRF60 IRF60-GS 77 Q8 Q63 IRF960 IRF960-GS 78 Q89-96 K30-Y 8 TO L TH Green 3 L L TO-9 8 U6-7 L7T TO-0-UP 8 U8-0 U6-7 MS7-3.3V 5 SOT3 84 Q3-36 Q84 Q97 KS85 8 TO-9 86 U U PM794 SSOP8 88 J4 J6-7 R H G/R/W color 3 R_JF 89 R39 R69 0R - Jumper R/8W 90 R7 0R - Jumper R/4W 9 R66 R77-78 R44-45 R50 R R 4 R/4W 9 R8 R R 3 R/4W 93 R35 R44 0k R/4W 94 R43 R40 R49-50 R k 6 R/4W 95 R60-6 R73-74 R8 0k 5 R/8W 96 R58 0R R/4W 97 R47-48 R40-4 5k 4 R/4W 98 R57 0R R/4W 99 R6 R49 30R R/4W 00 R4-4 R53 R65 R67 R79-80 R84 R90 R k R/4W 0 R75 47k R/8W 0 R45-46 R7 R87 R34 R k7 7 R/4W 03 R59 R83 4k7 R/8W 04 R54-56 R64 R76 R88-89 R R 9 R/4W 05 R48 75R R/8W 06 R R R/4W 0 R70-7 R4 R3 00k 4 R/8W R3 R0 R99 R7 0k 4 R/8W

33 Item Reference Value Qty P L R3 R30 R09 R7 0R 4 R/8W 3 R5 R3 R R9 50R 4 R/8W 4 R0 R R7 R9 R06 R08 R4 R6 k 8 R/8W 5 R7-8 R4-5 R03-04 R- 3k3 8 R/8W 6 R6 R3 R0 R0 3k0 4 R/8W 7 R86 R33 475R R/8W 8 R- R8-9 R9-9 R R 8 R/8W 9 R4 R3 R0 R8 49R9 4 R/8W 30 R6-7 R33-34 R-3 R30-3 4R0 8 R/8W 3 R4-5 R- R00-0 R8-9 56R 8 R/8W 3 R9 R R6 R8 R05 R07 R3 R5 8R5 8 R/8W 33 K- -V N RLY-N- 34 K3-5 TX-5V Panasonic 3 RLY-N- 35 U3 TORX47L, or TORX77L TORX47_OK 36 VR- VR5-6 VR 500R 0T 50 4 VRS-TOP-J 37 VR3-4 VR7-8 VR 5k 0T 50 4 VRS-TOP-J 38 U WM8804 SSOP0-39 J4-5 3M-H XLR male XLR-ML 40 J3 3F-H XLR female XLR_FML_G 4 Y MHz SMT XTL_H49SMT N4736 6V8 zener 4 O_MINIS 45 P Main oard F--IY-V5c 8x in FR4 46 NOS pcb NOS P NOS pcb 47 NOS Pcb Mount x5mm Screw NOS Mount 48 NOS Pcb Mount x 8mm spacer NOS Mount 49 H to H x 0mm Screw Heatsink mount 50 H to H spring washer 4 Heatsink mount 5 H-3 H0- -R insulation washer 6 Heatsink mount 5 H-3 H0- Mica TO-0 6 Heatsink mount FRONT PNL ONTROL OR U 74H4 SO4N 3 U 74H38 SO6N 4 U4 74H9 SO6N u 50V u u 0V or 6V 79-0 J x5.5mm male connector H-0V 3 J.5mm male H SIP-P 7 U3 FM06 SOT L Green 7 L 0 5 L Red L 6 R R6 R9 47k R-5 R8 R5 680R FP V7. pcb FP V7. pcb FP P 3 Mounting screws Screw x5mm 8 33 Mounting Spacer Spacer x8mm threaded 8 34 Flat cable 0 pin inches 35 5x.54mm plug for flat cable 5x header plug 36 Push Switch Push SW 37 Push SW wires with connector and socket Wire 00mm IS UGHTR OR 38 Mounting Spacer x 0mm Spacer plastic 3 39 Mounting Washer spring washer 3 40 Mounting screws x 0mm Screw 6 4 J3, J6, J7 (use only one) pins x x 8mm 4 J, J4, J5 (use only one) Pins x5 x 8mm 43 R, R4, R3 (use only one) 0R 44 R, R3, R0 (use only one) k 45 J, J8, J0 (use only one) RJ45 46 IS daughter board (choose FTudio, KingRex or MTech) IS daughter SM parts

34 FT udio 04/0/ ::55 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Red Solid Fft.h. mpl Left 0dFS Magenta Solid Fft.h. mpl Left istortion Hz - FFT 794 XLR.at7

35 FT udio 04/0/ :3:4 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Red Solid Fft.h. mpl Left input at -0dbFS Magenta Solid Fft.h. mpl Left distortion 0.007% Hz - FFT 794 XLR.at7

36 FT udio 04/0/ :33:48 0 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Hz Red Solid Fft.h. mpl Left at -60dFS Magenta Solid Fft.h. mpl Left - FFT dbfs.at7

37 FT udio 04/0/ :4: d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Red Solid nlr.level Left.98Vrms Magenta Solid nlr.thn Ratio Right istortion at 0dFS 3 Yellow Solid nlr.level Left 4 Red Solid nlr.thn Ratio Right Hz % - FFT 794 Freq Respon.at7

38 FT udio 04/0/ :7: d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Red Solid nlr.level Left at -0dbFS Magenta Solid nlr.thn Ratio Right distortion below 0.00% 3 Yellow Solid nlr.level Left 4 Red Solid nlr.thn Ratio Right Hz % - FFT 794 Freq Respon.at7

39 FT udio 04/0/ :43:50 0 d r k 4k 6k 8k 0k k 4k 6k 8k 0k k 4k Sweep Trace olor Line Style Thick ata xis omment Red Solid Fft.h. mpl Left 9&0kHz IM Magenta Solid Fft.h. mpl Left Hz - FFT 794 IM 9_0k.at7

40 FT udio 04/0/ :4:43 0 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Hz Red Solid Fft.h. mpl Left 00 & k IM Magenta Solid Fft.h. mpl Left - FFT 794 IM 00_k.at7

41 FT udio 04/0/ :49:45 0 d r k 4k 6k 8k 0k k 4k 6k 8k 0k k 4k Sweep Trace olor Line Style Thick ata xis omment Red Solid Fft.h. mpl Left jitter at 0mUI Magenta Solid Fft.h. mpl Left Hz - FFT 794 Jitter 0mUI.at7

42

43 FT udio 05/5/ :8:47 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Red Solid Fft.h. mpl Left 60W transformer Magenta Solid Fft.h. mpl Left 0dbFS Hz - FFT 794 XLR.at7

44 FT udio 05/5/ :0: 0 d r k k 5k 0k 0k Sweep Trace olor Line Style Thick ata xis omment Hz Red Solid Fft.h. mpl Left Magenta Solid Fft.h. mpl Left - FFT dbfs.at7

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