Quote:
Originally Posted by ms660
The first time I came across Class D was in one of Uncle Clive's adverts, way on back.
Lawrence.
|
I remember building up one of the Sinclair kits. I think it was in the early 1970s soon after an interesting article on the topic had been published- Wireless World I think.
AFAIR, it made quite a cheerful noise into a cheap speaker, but it died as soon as I connected a speaker with a crossover network. I think that the impedance became too difficult for it so that the switching was no longer fast enough to avoid heating up the output transistors. I did resurrect it, and modified it to a less ambitious spec - it's still in a junk box somewhere.
I guess that today's ubiquitous digital power amps are close relations of Class D output circuits.
Martin