Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5 mA of current for HeNe laser.
This simple circuit controls the signal amplitude through a photoresistor optical coupler. The...
This circuit can be implemented with standard photodiodes consisting of a two input optical AND gate....
In the figure we have the basic configuration of an operational amplifier for audio signals. The...