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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.


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