This circuit was found in the Linear Applications Handbook of the National Semiconductor of 1994. Some of the components used are not easy to obtain, but equivalents can be used.
Found in a 1970s RCA documentation, this circuit uses a relay to control external loads. R1 is 150...
The figure shows the equivalent circuit for the LM381 audio preamplifier IC. The circuit was found...
The circuit shown is for testing both signal diodes (low current) and rectifiers (high current). The...