Circuit - PotentiometerElectronic Circuits Designed by David A. Johnson, P.E.


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Display Circuits
Designed by David A. Johnson, P.E.
Last Updated on: Thursday, January 01, 2009 06:56 AM

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Isolated Power Supply for Digital Panel Meters -- September 13, 2008
Many inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery. However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground terminal of the panel meter’s input. This often makes it difficult to use with a common connection between a DC power supply ground and a sensor’s circuit ground. But, you can generate this floating voltage fairly easily using the simple circuit below.

Ten Turn Pot Forms Frequency Readout
Let’s say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since there is no such frequency as 0. But since many pot dials have a display....

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