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Tie a 12V 1/2W zener anode to source, cathode to gate on all the MOSFETs to protect from transients.

I'll do some more drawing. You bring up some good design questions for people not as accustomed to just making things up as they go along. Thanks for the questions, and watch for the additional info.

R.G.

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From:

Cornbread

Date:

7/21/2002 4:37 PM

Subject:

Re: Help needed with MOSFET source followers

Excellent info! Wow. I would love to see you write some articles on applications of Mosfet's in tube amps.

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From:

kg (ride5000@ride.ri.net)

Date:

7/21/2002 11:03 PM

Subject:

Re: Help needed with MOSFET source followers

have you been to his home page? i believe it's part of the reading list:

http://www.geofex.com/

there are articles on applications of all kinds of transistor circuits, as well as everything else.

ken

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From:

R.G.

Date:

7/22/2002 12:21 AM

Subject:

Re: Help needed with MOSFET source followers

I did some introspection and came up with a much more end to end set of circuits to do the MOSFET follower grid drive. Most of the complexity is in the power circuits, of course.

I used a source follower on the positive side with a second MOSFET's gate tied to +100V. This provides clean +100 to the follower MOSFETS to drive the gates.

I did a rectifier/filter/MOSFET active zener to make regulated -100V for the source side.

I'll get it drawn up. I think the whole mess of four MOSFETs and power resistors, filters, etc. can fit onto a neat small PCB or two.

R.G.

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