This code practice circuit was found in a 1990s issue of Radio Amaterur Today magazine. It produces an audio tone with the 555.
This circuit was found in a 1985 documentation. It provides an audiovisual indication of the...
This transistorized shift register was found in a 1970s RCA documentation. The used transistors can...
We found this circuit in a 1965 General Electric manual. The components are from the period. Time...