Author Topic: Low gate voltage on MOSFET booster?  (Read 2398 times)

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thelonious

Re: Low gate voltage on MOSFET booster?
« Reply #20 on: March 06, 2013, 06:45:51 AM »
Will do. That idea made me go read more about bypass caps, too---thanks for the motivation. I knew they increased the output of a stage by reducing/eliminating negative feedback at the cathode/source/emitter, but for some reason I never put it together that that less negative feedback at the source = more input gain within the same stage, and more NFB = lower gain in that stage... cool.

duck_arse

Re: Low gate voltage on MOSFET booster?
« Reply #21 on: March 07, 2013, 04:59:43 AM »
you could try replacing r1 and r2 with 33k each, with a 100k trimpot between them connected to r3/c3. then you could shift the bias point of the mosfet while watching the cro to get the maximum swing from your particular device. I'm surprised this hasn't already been suggested.
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