Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Gain 100 Amplifier 741 (CB11923E)
The voltage gain of this DC amplifier is 100 times, given by the relationship between R2 and R1....
Automatic switch 110 V to 220 V (CB16082E)
Here is a very useful circuit suggested by ICOTRON (Siemens) capable of eliminating the...
Switched Regulator from 5 v to -5 V (CB16029E)
This circuit, suggested by Texas Instruments, is based on the integrated TL497A, designed for...