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.
This circuit has already been explored in other articles on this site. It shows how we can use two...
This small control for DC motors up to approximately 1 A uses an operational amplifier that admits...
As in the previous case (CB5045E), we have in the circuit of the figure the use of the polarized...