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Old Yesterday, 03:09 AM   #1751
Circlotron is offline Circlotron  Australia
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Join Date: Jun 2002
Location: Melbourne, Australia
Quote:
Originally Posted by xrk971 View Post
Can you explain what the 2200uF cap tied to the speaker +ve and then the other end tied to the voltage divider from 100v does? It appears to be a bootstrap, and perhaps this is one way you were able to get the higher output without clipping the top?
Yeah, it's for bootstrapping. I was trying to get the gain of that first mosfet as high as possible. Eventually used a CCS load as well as bootstrapping and the gain was something like 3000. There was issues with LF instability where the speaker would slowly move to and fro on loud program material.Eventually settled on the cct attached here. Still have the amp sitting in the corner. Hasn't been fired up for yonks.
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