This interesting circuit in which the LED display is circular imitating a common clock appeared in the Radio Electronics magazine of May 1977. The power supply is included.
The purpose of this circuit found in a 1967 GE SCR manual is to control a heating element. The SCR...
We found this circuit in an old documentation. The operational amplifier of the time can be...
This power control from a 1968 Motorola manual shows how to use a contemporary diac as a...