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Isolated Power Supply for Digital Panel Meters 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....
