This circuit has the intensity of the signals controlled by the light that falls on the sensor. Note that it is not a frequency-controlled oscillator. Equivalent transistors can be used.
April 2017 - Mouser Electronics already has in stock the new HMC8400, Analog Devices low noise...
Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor...
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...