This dual balanced modulator configuration was obtained in a 1980s telecommunications documentation. The circuit makes use of transformers and the diodes are commonly used.
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...
This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at...
We found this circuit in a Mullard manual from 1960. The transistor is a phototransistor of the...