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Subject: Adjustable precision diode

Date: 05/09/02 at 11:27 PM
Posted by: Bob Jeffords
E-mail: rnscrs@execpc.com
Message Posted:

A simple low frequency-DC circuit I'm working on needs a precision voltage offset. Basically it is a voltage divider(0-5v) that needs to keep the output parallel to the input at >4v. A signal diode does the job, except the breakover voltage varies with current (0 to <1 ma), the voltage is not what is needed (.55v adjustable + - .1v), and the temco is too great and the wrong direction. Is there a simple 2 terminal circuit that can perform this function, or something that does not require many components. The circiut board for all this is less than .5 inch square. Your assistance appreciated.

Bob


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