Their has been a bit of interest for a replacement of what was the original Sanyo STK-0050 module used in a SX-780 receiver. Many question the integrity of what can be obtained these days as STK-0050 modules.

I decided instead of sending these files to individuals or trying to make a buck from folks needing them, I thought that it would be better served if I make a contribution to the community.

The design was simulated, so I will include the ltspice schematic. If someone wants the .asc file to play with I can provide that as well.

There were some earlier threads where I introduced this design, you can follow them for some background and pics of one implementation.

The pcb fab files use pcbway naming conventions. You can change them if you chose to use a different fab.

.GTL Gerber top layer

.GTO Gerber top overlay

.GTS Gerber top solder

.GBL Gerber bottom layer

.GBO Gerber bottom overlay

.GBS Gerber bottom solder

.GKO Gerber keepout layer

.DRD Excellon drill file

BOM:

863-MJE15032G MJE15032G ON Semiconductor Q3

863-MJE15033G MJE15033G ON Semiconductor Q2

863-NJW1302G NJW1302G ON Semiconductor Q1

863-NJW3281G NJW3281G ON Semiconductor Q4

80-R82DC3470AA60K R82DC3470AA60K KEMET C2

594-SFR16S0003929FR5 SFR16S0003929FR500 Vishay R9

594-SFR16S0004708JR5 SFR16S0004708JR500 Vishay R1,R5

594-5073NW4R700J PR01000104708JR500 Vishay R3,R4

594-SFR16S0003901JA5 SFR16S0003901JA500 Vishay R8

594-SFR16S0001211FR5 SFR16S0001211FR500 Vishay R6

833-RL202-TP RL202-TP Micro Commercial Components (MCC) D1,D2

534-9902 9902 Keystone Electronics Screw for Q1-4

534-9901 9901 Keystone Electronics Screw for Q5

534-4692 4692 Keystone Electronics for Q1,4

594-SFR16S0007509FR5 SFR16S0007509FR500 Vishay R2

951-SPK10-006-00-104 SPK10-0.006-00-104 Bergquist Company Ins for Q1,4

512-BD13910STU BD13910STU ON Semiconductor Q5

652-3362R-1-501LF 3362R-1-501LF Bourns R7

534-3049 3049 Keystone Electronics For Q2,3

567-120-SA 120-SA Wakefield-Vette

594-K221J15C0GH5TH5 K221J15C0GH5TH5 Vishay C1,3

532-53-77-4G 53-77-4G Aavid Ins for Q2,3

Mouser BOM upload:

863-MJE15032G|1

863-MJE15033G|1

863-NJW1302G|1

863-NJW3281G|1

80-R82DC3470AA60K|1

594-SFR16S0003929FR5|1

594-SFR16S0004708JR5|2

594-5073NW4R700J|2

594-SFR16S0003901JA5|1

594-SFR16S0001211FR5|1

833-RL202-TP|2

534-9902|4

534-9901|1

534-4692|1

594-SFR16S0007509FR5|1

512-BD13910STU|1

652-3362R-1-501LF|1

534-3049|2

567-120-SA|1

594-K221J15C0GH5TH5|2

532-53-77-4G|2

https://www.mouser.ca/Tools/ProjectCartSharing

Access ID: 976621ac80

The docs and fab data are in one zip file, stk-0050-8.zip

You are responsible to build it all yourself. I am here only to help, answer questions. I encourage others to help the ones that are doing this for the first time.

I did think about adding the protection circuitry (mtf mentioned it one time) as was done in the sx-880, but that I will leave for now as it requires further mod to the design (new pcb) and some extra wiring to match the sx-880 design.

Good Luck

Rick

Index:

Using the sub to replace the pair of STK0080's. Page 6, post# 107

Bias procedure for a .22 ohm emitters. Page 6 post #115.

Alternate outputs, Would FJP1943 / FJP5200 work? Yes, page 7 post# 123

Is there a way to set the idle current with these new modules? Yes

Procedure for idle setting on DBT. Page 23 Post# 451

Making the heatsinks ready for component install. Page 26 Post# 518

Will it replace the STK-0050II? Page 31 Post# 607

Fisher CA-800 sub install. Page 7 Post# 134

Fisher RS-2010. Page 29 Post# 576

Pioneer SX-680: Post #428, #571 in http://audiokarma.org/forums/index....lacement-for-sx-780-and-others.721181/page-29

Technics SU-V2 (STK-8040). Page 30 Post# 569

Speaker fuse size. Page 7 Post# 140 – 142

Fusing the circuit. Page 21 Post# 419

Current protection. Page 11 Post# 203

Other Output subs. Page 13 Post# 248

Alternate trimmer. Page 28 Post# 552-555

Q2 alternates. Page 25 Post# 495

R2 alternates. Page 13 Post # 259

Initial checks. Page 14 Post# 280

Installing the transistors. Page 15 Post# 281

Bias setting for the SX-780. Page 16 Post# 301

Does the sub work for a STK-0059? Yes. Page 17 Post# 329

More about the sub circuit design from Rick. Page 18 Post# 359

Technics SU-V4? Will it work? It should. Page 20 Post#386 and Post #410

Use in a SX-580. Page 21 Post# 417 and Post# 424 - 428