Chapter 19. Testing and Safety

 

‘Out of this nettle, danger, we pluck this flower, safety.’

 
 --William Shakespeare, Henry IV Part I

Testing and Fault-Finding

Testing power amplifiers for correct operation is relatively easy; fault-finding when something is wrong is not. I have been professionally engaged with power amplifiers for a long time, and I must admit I still sometimes find it to be a difficult and frustrating business.

There are several reasons for this. Firstly, almost all small-signal audio stages are IC based, so the only part of the circuit likely to fail can be swiftly replaced, so long as the IC is socketed. A power amplifier is the only place where you are likely to encounter a large number of components all in one big negative-feedback ...

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