Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be symmetrical at 15 V.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
The purpose of this circuit is to trigger an oscillator with the light of dawn. The tone of the...
This fast inverter amplifier with high input impedance uses operational amplifiers from the 80's,...