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This old amp is good?
This old amp is good?
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Old 11th September 2011, 10:04 PM   #1
tadiam1 is offline tadiam1  Argentina
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Join Date: Dec 2009
Location: argentina
Default This old amp is good?

See this....
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Old 12th September 2011, 02:08 AM   #2
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
This old amp is good?
Hard to say. This amp doesn't appear to have any SOA protection for the output devices. And the output devices aren't complementary, so that's generally means compromised performance. I'm guessing a LM3886 chip amp would vastly outperform it, cost less to build, and survive errors like shorted speaker cables.
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Old 12th September 2011, 09:04 AM   #3
ingenieus is offline ingenieus  South Africa
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Join Date: Apr 2011
Location: Pretoria
If you are going to build an amp, you might as well use modern components...

Judging by the +20V power supply it's not going to be hugely powerful.
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Old 12th September 2011, 10:04 AM   #4
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
A simple and typical LIN topology amplifier.
Added features:
CCS tail for the LTP
CCS load for VAS
Complementary drivers
Quasi complementary NPN outputs.

This will work as a basic low power amplifier. It will teach one a lot about how a simple LIN amp goes together.
It can be used as the basis for extended experiments on other features that can be added to improve performance and reliability.
I see the circuit as educational rather than music reproducing.
regards Andrew T.
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