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Old 10th March 2010, 07:46 PM   #131
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Allright.

Interesting thing, these 18k+19k - haven't thought of that.

After all, one single sinewave doesn't seem to be a sufficient approximation to music, when it comes to such details.

I will have to think about that.

I might have a look at some band limited pink noise signals and what slew rate they might ask for... (hmm, I guess actual music might do the job as well )

but this is leading a bit off topic, maybe...
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Old 11th March 2010, 06:40 PM   #132
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Originally Posted by khalsa View Post
hi apex thanks for send the power suplly pcb layout but i want the layout of your 20 no fourm kindly send me
This PCB is still in comercial use, posted Power and Protect PCB with Soft-Start is compatibile with MOSFET AMP. This PSU PCB is for stereo amplifier.
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Old 12th March 2010, 03:31 AM   #133
khalsa is offline khalsa  India
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hi apex i am used this circuit for comercial audio kindly send me the circuit and pcb layout thanks khalsaaudiocenter@yahoo.com
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Old 12th March 2010, 09:30 AM   #134
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PCB still uses in comercial products is not for share.
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Old 16th March 2010, 07:07 PM   #135
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BC327 and BC337 was replaced with BC640 and BC639. Pin layout on PCB is ECB and not compatible with CBE of BC327/BC337.
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File Type: jpg APEX MOSFET schematics.jpg (615.8 KB, 1612 views)
File Type: jpg APEX MOSFET MONT.jpg (372.3 KB, 1409 views)
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Old 16th March 2010, 07:20 PM   #136
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PCB with changes.
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Old 18th March 2010, 05:42 PM   #137
khalsa is offline khalsa  India
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hi apex what is the function off Q 22,23

Last edited by khalsa; 18th March 2010 at 05:49 PM.
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Old 18th March 2010, 05:51 PM   #138
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hi apex what is the function off q 22,23
VI cut-out. Post signal to protect bord #122.
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Old 19th March 2010, 05:21 PM   #139
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Simple Full Complementary Simetry +/-80V. Voltage amplifier/driver biased with 30mA. This driver circuit stabilized BIAS in output stage. Exelent stability without oscilation, hum and noise, sound great.
RMS Power: 240W 8ohm, 350W 4ohm

Nice work. I have something similar. Topology Federmann, HQQF-55 ...
I will soon publish a detailed plan and the results of all measurements and tests. I have very many interesting results.
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Old 19th March 2010, 08:43 PM   #140
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Nice work. I have something similar. Topology Federmann, HQQF-55 ...
I will soon publish a detailed plan and the results of all measurements and tests. I have very many interesting results.
Thank you, but I see much diferent design.
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