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My first designed amp
My first designed amp
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Old 2nd September 2011, 04:25 PM   #1
danuphonj is offline danuphonj
diyAudio Member
Join Date: Feb 2011
Smile My first designed amp

Try it. Don't believe me.
I like its sound more than non inverting LM3875 and inverting LM3875.

I don't know why the simulation R7 = 53.5k but the real world R7 = 30k.

*** R7 must be 30k ***
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Old 2nd September 2011, 09:17 PM   #2
samod is offline samod  Ukraine
diyAudio Member
Join Date: Apr 2004
Location: Kiev
My first designed amp
Hello, maybe you to try so?
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Old 3rd September 2011, 10:46 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
The value of R7, the bias voltage applied to the FET gate, must be determined for each individual FET used.
The Vgs of FETs are all over the place. Test and measure every FET to allow a sensible prediction of the required bias voltage.
Or make a temporary connection with a VR and adjust the output voltage of the FET to a satisfactory operating point. Then replace the temp VR with a fixed R of equal value and re-check the FET output voltage..
regards Andrew T.
Sent from my desktop computer using a keyboard
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