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

Digital Volume Control
Audio Mixer with 2N3819
stereo pll fm transmitter based bh1417
High Power Square Wave Generator (0-500V 25A)
Centrifugal fish autofeeder
ECM Mic Preamp Project
555 Monostable Multivibrator
AMPLIFIER WITH FORCED EQUILIBRIUM ADAPTOR
Nathans Z80 Project Mark 2
TWO SLEW RATES
Single-phase motor energy consumption of the two brake circuits



Top