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 for the medium wave range was suggested by a Popular Electronics from the 90s. The...
This version of a call-fish is from 1981 using, for this reason, a 90 V battery that is no longer...
This musical doorbell was found in a Popular Electronics from the 90s. The U4 melody generator...