This circuit was found in documentation from the 1970s. The transistor supports modern equivalents. L1 with C4 determines the frequency range of the signals that will be produced.
This circuit was obtained in a Radio Shack documentation from 1977. The circuit generates a...
This commercial circuit of 3 transistors was found in Japanese documentation from the 1960s. The...
This electronic car lock was found in a 1988 magazine. It uses a code key that must be activated to...