This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
This circuit is the digital indicator for the previous circuit and can be used with similar...
This circuit is found in documentation from the 1990s. The load can be a relay and the sensor, an LDR of...
This circuit limits (clip) the intensity of a signal, according to the setting of P. The circuit is...