100K megohm DC probe


Posted on Jul 19, 2012

A 741 op amp is used with 100% ac and dc feedback to provide a typical input impedance of 1011 ohm and unity gain. To avoid hum and rf pickup the input leads should be kept as short as possible and the circuit should be mounted in a small grounded case. Output leads may be long since the output impedance of the circuit is a fraction of an ohm


100K megohm DC probe
Click here to download the full size of the above Circuit.

With no input the output level is indeterminate. Including Rl in the circuit through lowers the input impedance to 22 M.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mobile MP3 Player PC
Interfacing seven segment to microcontroller
Track-and-hold-sample-and-hold
LED Audio Level (VU) Indicator and Alarm: The Dot Turns to Bar When The Signal Reach The Maximum Le
servo creating a switch using arduinos digital outputs
12 Volt fluorescent lamp drivers
H-bridge
Download NL5 Non-Linear Electronic Circuit Simulator
Calculo Odometria
Sawtooth generator circuit II



Top