4watt classic OTL amp...

DarkHorse · 27th August 2006, 12:49 PM

I have draw this schematic today,very simple things:

DarkHorse · 27th August 2006, 12:54 PM

by adjusting RP2 to more small value,you can increase the biasing of output stage.make it up to 20mA~30mA is suitable.

DarkHorse · 27th August 2006, 02:10 PM

one mistake I make,V1 should be DC32V if you want the circuit can ouput 4W(RMS),Using DC25V you can only get about 2.6W(RMS),sorry for this!

Enjoy it!
WINCO

MikeB · 27th August 2006, 03:09 PM

Hmm, you write "no global NFB", but i see gnfb over R10/RP1 ???

Mike

wojtek5001 · 27th August 2006, 05:16 PM

There is a global NFB through R10 and R11. If You bypass RP1 by capacitor (for example), there will be no global NFB. Anyway, nice schematic

DarkHorse · 28th August 2006, 12:54 AM

there just DC NFB when input end has no resistor,haha...

Leolabs · 28th August 2006, 02:32 AM

27th August 2006, 05:16 PM	#5
wojtek5001 diyAudio Member Join Date: Jul 2005 Location: Podkarpacie, Poland	No global NFB? There is a global NFB through R10 and R11. If You bypass RP1 by capacitor (for example), there will be no global NFB. Anyway, nice schematic

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27th August 2006, 12:54 PM	#2
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	by adjusting RP2 to more small value,you can increase the biasing of output stage.make it up to 20mA~30mA is suitable.

27th August 2006, 02:10 PM	#3
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	one mistake I make,V1 should be DC32V if you want the circuit can ouput 4W(RMS),Using DC25V you can only get about 2.6W(RMS),sorry for this! Enjoy it! WINCO

27th August 2006, 03:09 PM	#4
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Hmm, you write "no global NFB", but i see gnfb over R10/RP1 ??? Mike

28th August 2006, 12:54 AM	#6
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	there just DC NFB when input end has no resistor,haha...

28th August 2006, 02:32 AM	#7
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam

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