This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
The voltage gain of this DC amplifier is 100 times, given by the relationship between R2 and R1....
Here is a very useful circuit suggested by ICOTRON (Siemens) capable of eliminating the...
This circuit, suggested by Texas Instruments, is based on the integrated TL497A, designed for...