The signals from this circuit obtained from the 1965 Radio Shack documentation are picked up from a medium wave receiver. L1 and L2 have 80 to 100 turns of yarn 28 on a ferrite rod.
This simple CMOS touch switch was obtained in a 1987 publication. All components are common and the...
This transceiver circuit was found in a 1997 documentation. The circuit operates in the 80 meters...
This interesting circuit records a few seconds of audio signals, reproducing them in a small...