Darkhorse, yes, that's one where the transformer is on the collector.
you can also put a (step-up) transformer on the emitter: essentially using the transistor as a current amplifier and the (step-up) transformer as a voltage amplifier. aka the Zeus.
it takes the feedback off the primary side of the transformer, uses a BJT (or mosfet) for input. that way, you don't have DC going through the speaker.
原帖由 millwood 于 2009-4-6 22:05 发表
how about this one?
it takes the feedback off the primary side of the transformer, uses a BJT (or mosfet) for input. that way, you don't have DC going through the speaker.
very good idea,you can also do it like you posted schematics...but using a bjt as pre-stage,you should care about it's noise...J-FET is much suitable be here...
and just a very small currency through of the speaker...you have no need to worry about it!
have fun,millwood !
发表于 2008-10-18 15:58
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