Circuit Specialists Inc.

[Orin Eman]

> I want to build an O2 meter and use a digital panel meter instead of the
> usual LED display.  Circuit Specialists offer digital panel meters for $10
> each while Digikey and KNS are asking $40 - $80 each.  At that much of a
> price differential I have to wonder if there is a major difference in
> quality also.  Comments?

Are the Circuit Specialists displays backlit?  Most of the Digikey ones
are as I recall.

I'd check how frequently the meter updates.  Usually it's only a couple
of times a second.  You would want a low pass filter with a cutoff of
around 1Hz before the meter to produce sensible results!  You can see
the O2 signal swing back and forth on LED type displays - if that's what
you want of course.

Orin.