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Subject: Re: op-amp voltages
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Date: 12/10/02 at 9:58 PM
Posted by: Russ Kincaid
In Reply to: op-amp voltages posted by David on 12/10/02 at 7:08 PM:
What you have described is a voltage controlled current source, and it should work. Some possible problems: Long wires that have enuf inductance that the mosfet goes into RF oscillation. You say there are two mosfets, are they common in any way? If the mosfets are being paralleled, try putting 10 or 20 ohms in series with each gate. Or, shorten the wires and put 20 ohms in series even if they are not parallel.
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