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Display Circuits
Circuits designed by David Johnson, P.E.
Last Updated on:
Wednesday, April 28, 2010 03:53 PM
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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.
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- 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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