This optical sensor circuit for a robot was found in the March 1986 issue of Radio Electronics magazine. It controls two motors according to signals from optical sensors or couplers.
This circuit is from old European documentation. R1 depends on the output voltage of the...
This SCR circuit activates a buzzer when triggered. The circuit is from a Popular Electronics from...
This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is...