This circuit generates control signals for stepper motors. We found it in a 90s Popular Electronics. The power can be made with a 5 V supply so that it works as a shield.
If we modulate a beam of light from an LED, for example, we can receive this beam of light at a...
This circuit is from a publication of the 70s, but it can be easily assembled with the BC548. The...
In the circuit in the figure, when a pulse of light falls on the LDR, the circuit arms with the...