Audio Cable Tester (CB3827E)

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

Transmitter for Thermocouple LM10 (CB14312E)
The components used in this National Semiconductor circuit are not common today, but the...
Mike Gain Increaser (CB17253E)
This 2001 circuit is used with transceivers to increase the gain of a microphone and thus obtain...
2-Transistor Regulator (CB20298E)
In the figure we have the configuration of a variable voltage regulator with two transistors and a...