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DMM or digital multi meter

Description of  Circuit orcad html
LM3914 analog display and resistance measurement. 20008.zip
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Analog and 3-1/2 digital display for +/- 199.9mV. 20009.zip go
Power supply with battery backup for DMM. 20010.zip go
DMM range and AC-DC mode, logic control. 20011.zip go
AC conversion and continuity buzzer test. 20012.zip go
Voltage  measurement attenuator amp.  20013.zip go
Current Shunt Amplifier with digital control.
20014.zip go
Resistance measurement with Current Source.
20015.zip go
Analog Buffer and Inverter Switching with logic.
20016.zip go

I have documented a lab DMM i had built for my use many years ago. the circuits may have errors,  build it only if you understand.


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