Led Millivoltmeter


Posted on Jan 2, 2013

This circuit uses a dc amplifier (324) in a bar-graph circuit that uses an LM339 Quad comparator IC to sense dc levels.


Led Millivoltmeter
Click here to download the full size of the above Circuit.

The LEDs will light every 100 mV. The 324 op amp is configured to provide a gain of 100 to increase this sensitivity to 1 mV. Two auxiliary LEDs indicate "power on" and "xlOO" gain setting.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Analogue Pitch Shifter
Decibel-o-meter and white noise generator
4-Way Logic Probe
Geiger Counters
1998 DeVille: front power windows work ok left front window switch
super simple shortwave receiver circuit



Top