20 Watt Class A amplifier

JOE DIRT® · 28th June 2003, 05:48 PM

I found a schematic of this easy to build Class A amp that would be great for a beginner

PMA · 28th June 2003, 05:55 PM

Based on John Linsley Hood's 34 years old project, modified probably by Rod Elliott. Not so bad (and not excellent), for the real beginners you will find more suitable schematics with similar or better parameters and sonic results.

paulb · 28th June 2003, 10:20 PM

Yes, the Death of Zen. Aspiring builders should note that you need big heatsinks for this one, and there is an update to regulate the voltage on the first trimpot.
http://sound.westhost.com/project36.htm

Bob03 · 28th June 2003, 10:58 PM

http://diyaudio.8m.com/Bebet/bebet_sch.html

PGW · 28th June 2003, 11:23 PM

The Lang 20W MOSFET Class A amp is an alternative (The Audio Amateur 2/86). Perhaps a bit coplicated for a complete beginner, it does have a PCB layout, though I don't know whether boards are still available, and a component stuffing plan.

It has paralleled MOSFET output, so if 20W is too much, you could omit one pair of the output FETs, and reduce the size of the transformer (reduce your electricity bill, too).

The circuit is in 'The Audio Amateur Power Amp Projects' - I don't have a copy of this book.

Nelson Pass · 29th June 2003, 05:11 AM

Quote:

Originally posted by PMA
Based on John Linsley Hood's 34 years old project, modified probably by Rod Elliott.

Perhaps it would be more aptly named "The Resurrection of Hood"

JOE DIRT® · 29th June 2003, 05:38 AM

I`m aware of the design and if this thread is useless please delete it

DIRT®

PMA · 29th June 2003, 06:40 AM

Joe Dirt: Oh no, why to delete.

Nelson Pass:

xandaobh84 · 31st January 2012, 11:41 PM

Quote:

Originally Posted by JOE DIRT®

I found a schematic of this easy to build Class A amp that would be great for a beginner

Amplificador KB90 – 90 Watts R2 Network
This version is really really easy to build.... for beginners...

28th June 2003, 10:58 PM	#4
Bob03 diyAudio Member Join Date: Jan 2003 Location: Canada	Bebe T http://diyaudio.8m.com/Bebet/bebet_sch.html

28th June 2003, 11:23 PM	#5
PGW diyAudio Member Join Date: Jun 2003 Location: SoCo	Lang 20W MOSFET The Lang 20W MOSFET Class A amp is an alternative (The Audio Amateur 2/86). Perhaps a bit coplicated for a complete beginner, it does have a PCB layout, though I don't know whether boards are still available, and a component stuffing plan. It has paralleled MOSFET output, so if 20W is too much, you could omit one pair of the output FETs, and reduce the size of the transformer (reduce your electricity bill, too). The circuit is in 'The Audio Amateur Power Amp Projects' - I don't have a copy of this book.

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28th June 2003, 05:55 PM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Based on John Linsley Hood's 34 years old project, modified probably by Rod Elliott. Not so bad (and not excellent), for the real beginners you will find more suitable schematics with similar or better parameters and sonic results.

28th June 2003, 10:20 PM	#3
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Yes, the Death of Zen. Aspiring builders should note that you need big heatsinks for this one, and there is an update to regulate the voltage on the first trimpot. http://sound.westhost.com/project36.htm

29th June 2003, 05:38 AM	#7
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	I`m aware of the design and if this thread is useless please delete it DIRT®

29th June 2003, 06:40 AM	#8
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Joe Dirt: Oh no, why to delete. Nelson Pass: