Suggested by Motorola in 1968 documentation, this circuit has an efficiency of 70%. Power transistors are types of the time as are transformers.
We found this circuit in a publication of 1991. The audio amplifier is an operational that admits...
Found in an 80's Hands On Electronics, this circuit turns on a light when it gets dark and goes...
This circuit regulates the output voltage of a 78xx according to the light incident on the sensor....