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DIY Stompboxes => Building your own stompbox => Topic started by: smoguzbenjamin on June 28, 2004, 02:08:24 PM

Title: How to increase output from FET? Help needed quick!
Post by: smoguzbenjamin on June 28, 2004, 02:08:24 PM
hey guys

Take a look at the Little Gem Mk II schemmo at www.runoffgroove.com for me. It uses a little FET buffer in front of it. To increase the output from that, what do I do? Should I change the 27k resistor from Source to ground or something else?

Cheers
Ben
Title: How to increase output from FET? Help needed quick!
Post by: R.G. on June 28, 2004, 02:28:09 PM
As shown, it's a source follower - that means gain can't be more than one. The schem shows a 10K resistor to ground from the source when I looked.

What you could do is to make the source-ground resistor 4.7 to 6.8K, use a 22K to 47K resistor from drain to +9, and reconnect the 386 input cap to the drain, not the source. That would at least get you some gain.
Title: How to increase output from FET? Help needed quick!
Post by: smoguzbenjamin on June 28, 2004, 04:14:24 PM
Ah, I didn't know that. 8) Thanks RG!
Title: How to increase output from FET? Help needed quick!
Post by: spongebob on June 28, 2004, 04:14:51 PM
:arrow: http://www.runoffgroove.com/fetzervalve.html
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