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.
We found this circuit in a 90's EDN. The circuit is based on a control integrated that is still...
This circuit is based on a Texas LinMOS integrated circuit that consists of an operational...
This circuit, when connected to the 110 V power grid makes it possible to test capacitors with...