This control for 1200 W of power was found in the documentation of General Electric of 1966 has a activation delay. The triac must be according to the load.
Two transistor cascode amplifier. This voltage amplifier was found in a publication from the 50's....
Using NPN transistors, this circuit activates a voltage relay according to the power supply. The...
With the presented circuit it is possible to detect signals from transmitters in a frequency range...