Power for panel meter

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eric

Posted: Tue Oct 10, 2006 12:13 am Post subject: Power for panel meter

Site Admin Joined: 01 Jan 1970 Posts: 311

Most meter modules using a liquid-crystal display
(LCD) and some using a light-emittingdiode
(LED) display need a power source that
is isolated from the measurand. In practice, this
normally means that a separate battery has to
be used. This is cumbersome and can be
avoided with the circuit described in this article.

I N T R O D U C T I O N
It is an annoying fact that when it is
desired to fit a digital panel meter to a
certain equipment, the power for this
often cannot be drawn from the supply
for that equipment. This is not
always so, but it certainly is in the case
of meters based on the popular
ICL7106 and ICL7107. This means that
a separate supply has to be provided
for the meter whose earth (common
return) is isolated from

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