This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
jkjjjjj Used to measure night light for the purpose of adjusting camera exposure time, this...
This rev counter, which can be used in a car or engine, was found in a French magazine Radio Plans...
This circuit was originally created to increase the power of car radios of the 790s and 80s that...