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DC Servo MOSFET Amplifier
DC Servo MOSFET Amplifier
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Old 15th September 2010, 10:24 PM   #111
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by theerasak khan View Post
Hi Apex
I have a question for thisamp.
How many power supply and idle current adjusting?
Thank you.
PSU +/-56V 5A , bias 100mA per mosfet.
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Old 15th September 2010, 10:34 PM   #112
theerasak khan is offline theerasak khan  Thailand
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Hi Apex.
Do you have pcb. Thank
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Old 15th September 2010, 10:45 PM   #113
apexaudio is offline apexaudio  Serbia
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Originally Posted by theerasak khan View Post
Hi Apex.
Do you have pcb. Thank
This is my very old amp (see post #99), there is no any files, but no need for new pcb design, just copy from old pcb.
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Old 15th September 2010, 10:59 PM   #114
glazarou is offline glazarou  Greece
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hmm..ok seems that ac analysis in this circuit cant work well or something else dont know..
i changed frequency manually from source and i got same output for all the bandwidth.... i was like WTF ...
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Old 16th September 2010, 05:48 AM   #115
Tekko is offline Tekko
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Never trust simulation! I've had things not work at all in simulation that have worked perfectly fine in reality and vice versa.
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Old 16th September 2010, 05:57 AM   #116
ostripper is offline ostripper  United States
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Quote:
Originally Posted by Tekko View Post
Never trust simulation! I've had things not work at all in simulation that have worked perfectly fine in reality and vice versa.
I differ... I have had things simulate well in multisim but lockup LTspice. The operators knowledge doing the simulation , the simulator itself ,and the models used will determine the accuracy of the simulation. I just had LT predict my OPS bias point within 1mv from the simulation to the real thing. I knew almost exactly where to set the trimmer to get my 70ma VBias beforehand, no guessing .

I have also simulated classic designs and the simulator predicted the bandwidth and THD within a few % of the OEM specifications ... again, I had to use accurate models that matched the OEM's specs.

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Old 16th September 2010, 07:15 AM   #117
glazarou is offline glazarou  Greece
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Actually is not that multisim doing wrong but its difficult to understand its mind and how it calculate some things...
if i find time i will seperate the schematic into stages and i will see which stage doing this low-pass filter response....
i have already tested the opamp stage and i got clear response...

Last edited by glazarou; 16th September 2010 at 07:18 AM.
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Old 16th September 2010, 08:43 AM   #118
apexaudio is offline apexaudio  Serbia
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[QUOTE=glazarou;2303361]Apex seems i begin to love this amp ...the corrected clear schematic is this...

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with different R14 values(tried 22k,30k,56k) and different supply voltage, circuit gave 50W-200W on 8ohm with great frequency response....

I like F100 and use it many times in the past, I wiil build new version. It's great sounding amp and great reability amp but not popular in DIY, I think diyers don't like use OP in amps.
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Old 16th September 2010, 08:52 AM   #119
apexaudio is offline apexaudio  Serbia
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I think if many diyers rebuild Japanese amps from 80' , why not I rebuild my old amps, it's simple and not expensive for DIY.
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Old 26th September 2010, 11:01 PM   #120
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50W Amplifier schematic from Elektor.
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