Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be symmetrical at 15 V.
We found this circuit in a Motorola documentation from 1968. Phototransistors are common and...
This circuit was found in an application note of the Linear Technology LTC1145. The circuit can be used...
This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the...