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April 21, 2014, 03:38:10 AM
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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Low gate voltage on MOSFET booster? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Low gate voltage on MOSFET booster?  (Read 1413 times)
thelonious
Posts: 273

Tristan


Re: Low gate voltage on MOSFET booster?
« Reply #20 on: March 06, 2013, 10:45:51 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.
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duck_arse
Posts: 1730



Re: Low gate voltage on MOSFET booster?
« Reply #21 on: March 07, 2013, 08:59:43 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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