This 4-channel mixer amplifier was found in an American publication from 1947. The circuit uses counterphase output tubes and a transformer power source.
When the illumination decreases, this multivibrator starts up, causing the lamp to blink at a...
The operation of this circuit is old, but the configuration can be elaborated based on modern...
This circuit activates an incandescent lamp when the light stops falling on the sensor. The...