Mini Class-A SE amplifier needed

neazoi · 05:50 PM

Hello, I am trying to drive my minimus-7 monitor speakers with something better than these cheap IC amplifiers. Size is an issue, trying to squeeze the circuit into a small box with not so BIG heatsink (mayby with a fan too)
Would you recommend the next schematics? Or what else?
3 - 5 Watt Class-A Audio Amplifier Circuit Diagram | Circuit and Wiring Diagram
http://projectcircuit4u.blogspot.com...amplifier.html

The power is quite low but the transistors are small too, which make the amplifier quite small in size.

Nico Ras · 6th November 2011, 07:17 PM

Follow the thread with regard to JLH 10 watt class A, it is a proven design and well liked amplifier. You can scale it down to 5 watt if that is what you need.

Elvee · 6th November 2011, 07:25 PM

Class A SE is inherently wasteful and it is the worst choice possible if heatsinks have to be kept small.
But for class A (not SE), the JLH is indeed probably the best alternative regarding the performance/complexity ratio.

If you are in stereo, you can try my trick of the SE regulator chip amp: it has a slightly improved efficiency compared to a regular SE.

6th November 2011, 05:41 PM	#1
neazoi diyAudio Member Join Date: Aug 2007	Mini Class-A SE amplifier needed Hello, I am trying to drive my minimus-7 monitor speakers with something better than these cheap IC amplifiers. Size is an issue, trying to squeeze the circuit into a small box with not so BIG heatsink (mayby with a fan too) Would you recommend the next schematics? Or what else? 3 - 5 Watt Class-A Audio Amplifier Circuit Diagram \| Circuit and Wiring Diagram http://projectcircuit4u.blogspot.com...amplifier.html The power is quite low but the transistors are small too, which make the amplifier quite small in size. __________________ Great DIY site: http://www.neazoi.com Last edited by neazoi; 6th November 2011 at 05:50 PM.

6th November 2011, 07:17 PM	#2
Nico Ras diyAudio Member Join Date: Nov 2005 Location: Amanzimtoti - East Coast of South Africa	Follow the thread with regard to JLH 10 watt class A, it is a proven design and well liked amplifier. You can scale it down to 5 watt if that is what you need. __________________ Kind regards Nico

6th November 2011, 07:25 PM	#3
Elvee diyAudio Member Join Date: Sep 2006	Class A SE is inherently wasteful and it is the worst choice possible if heatsinks have to be kept small. But for class A (not SE), the JLH is indeed probably the best alternative regarding the performance/complexity ratio. If you are in stereo, you can try my trick of the SE regulator chip amp: it has a slightly improved efficiency compared to a regular SE. __________________ . .Circlophone your life !!!! . . ♫♪ My little cheap Circlophone© ♫♪

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