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Old 11th September 2011, 11:04 PM   #1
tadiam1 is offline tadiam1  Argentina
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Default This old amp is good?

See this....
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Old 12th September 2011, 03:08 AM   #2
dangus is offline dangus  Canada
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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, 10:04 AM   #3
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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, 11:04 AM   #4
AndrewT is offline AndrewT  Scotland
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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.
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