We found this circuit in the 1964 RCA transistors manual. The transistors used are uncommon today, but they can be used equivalent. The circuit controls the operation of a heating element.
Found in 1960's Radio Electronics, this circuit provides an audio tone that depends on the logic...
This receiver was found in the Radio Electronics magazine of March 1953. It tunes to the medium wave...
Mouser Electronics offers a vibration sensor which is considered the smallest in its class. This...