This ultra-low distortion driver was found in 80's Analog Devices documentation. The circuit has a THD of -115 dB under load of 600 ohms at 20 kHz.
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...
Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz...
This shield from the 60's uses a germanium transistor of the time and a common type of relay of...