Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be symmetrical at 15 V.
This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974....
We found this circuit in a technical documentation on thyristors from the 70s. The circuit is set...
August 2017 - Microchip's new ATtiny1617 8-bit AVR microcontrollers running at 20 MHz and 16 kB...