We found this circuit in the September 1985 issue of Radio Electronics magazine. It uses CMOS integrated circuits and is part of a larger integrated circuit test project.
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...