Found in American documentation from the 90s, this circuit can measure frequencies on a linear scale from 0 to 1 kHz. The components can be changed to measure other ranges.
This circuit, from the 1977 GE semiconductor manual, uses a unijunction transistor beyond the...
This circuit, when connected to the 110 V power grid makes it possible to test capacitors with...
This circuit was found in a Texas Instruments handbook about operational amplifier. It has a very...