2stageEF high performance class AB power amp / 200W8R / 400W4R

[astx]

Looks very good! May I ask what you've paid for?

BR, Toni

 

[HRDSTL]

Dear Toni,
400x210mm + black elox (117,65€), ...I'll do the drilling and threading myself.

Modushop heatsinks: 200x210mm 2x (91.74€) + base plate 10mm drilled + thread cutting (50€)

 

[HRDSTL]

@astx Please help me find male and female connector see attachment in Mouser or TME. The IL74 optocoupler used in the backpanel is obsolete, can a replacement MCT2EM be used?

Thank You!

 

[astx]

I have used CNY17-4 with DIP6 footprint.
Maybe also the MCT2EM will work too. Just compare the datasheets.

For the AN1-5 ports you can use any type of 2 row pin headers in 2.54mm raster.

BR, Toni

 

[astx]

Search for Pin headers or IDC connectors @ TME

BR, Toni

 

[astx]

SA2021-NCH: First hearing test - IMHO very impressive! 😎

 

[inyashd]

Toni Sir,
Waiting for final SA2021 -NCH Schmatic / build details / bom / pcb & more.

 

[astx]

The final schematic from post #3,117 differs only in the value of the MOSFET source resistors.
Schematic has had 0R, the final value is 0R047 (KOA Speer BPR58)
PCB's are available soon but no gerber files.

BR, Toni

 

[HRDSTL]

Tony if you can compare of all the amps you've built SA2014 to SA2021, which is the best sounding so far?

 

[diyralf]

SA2021-NCH: First hearing test - IMHO very impressive! 😎

Nice Toroidy condoms!

 

[astx]

Tony if you can compare of all the amps you've built SA2014 to SA2021, which is the best sounding so far?

Both are gainwires! THD+N is hardly measureable. SA2021-NCH is higher power, greener and more expensive, much more expensive...

 

[HRDSTL]

Drilling and tapping for today. Just only the holes for the transistors, ... (slow progress but progress) 🙂

 

[HRDSTL]

Drilling is done.

 

[astx]

Perfect handcrafted workmanship!

 

[astx]

SA2021-NCH: case design study. Would be my first tower design if it will ever materialize ... 😉
Side panels and part of top panel are translucent black acryl so it would allow to have a look inside when LED stripes are installed.
EMI is blocked using hexagonal aluminium panels mounted between acryl and inside steel panels.

Have fun, Toni

 

[HRDSTL]

Tony,
I want tomorrow to cut out the pad under 8 transistors, I have Keratherm 86/60 (4.5 W/mK), is it necessary to put paste between the transistor and the pad?

 

[astx]

No - that's only necessary if you use kapton tape, hard ceramic or silver mica for isolation.

 

[HRDSTL]

Finally the cable finished, probably ate up most of my nerves! I'm still going to wind the choke and the first test can begin!

I still don't know how to solve the aesthetic side of the pcb, I can't get to all the pins of the transistors to pinch off them. Obstructing capacitors 🙁

 

[astx]

May help: Electronics End Cutting Nippers ESD / Vornschneider

Electrolytics should be soldered as last step before final mounting.

 

[HRDSTL]

Toni, I managed to find a Knippex with which to get there 🙂
I'm done for the day.