With this circuit, signals in the range of 10 kHz to 150 kHz can be received at close to 4 MHz from a shortwave receiver. The circuit is from a 303 Circuits from the 90s.
This car alarm was obtained in a Signetics documentation from the 1980s. The circuit uses the 555...
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
This integrated is indicated for sound systems of stereo televisions and stereo radios. Its pinout...