This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can use any unijunction and the SCR is load sensitive.
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
The figure shows how to use an operational amplifier with a low impedance head. The gain is...
Voltage comparators, such as those in the LM139/239/339 series, consist of devices that can be...