Posted on Jun 24, 2012

This de voltmeter, with high input resistance, uses a CA3130 BiMOS op amp and measures voltages from 10 m V to 300 V. Resistors R12 and Rl4 are used individually to calibrate tbe meter for full:scale deflection.

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

Potentiometer R6 is used to null tbe op amp and meter on the 10-mV range by shorting tbe input terminals, then adjusting R6 for tbe first indication of upscale meter deflection.

Leave Comment

characters left:

New Circuits



Popular Circuits

4 MHz Modulated Oscillator (2N4401)
PIC18 programmer
Mosfet amplifier schematic 25 Watt
Microvolt probe
The Arduino Internet Gizmo
Regulated 24 Watt Broad Spectrum LED
Automatic headlight dim switch
15 kV @ 30 mA Floating-Output AC or DC High-Voltage Power Supply
The L3 Wire-amplifier NH19-6112
MIDI Drum Machine Schematic Main CPU Section
RF Module Interfacing Circuit Example
Pulsed LC Oscillator