Found in a 1966 General Electric documentation, this dimmer should only be used with incandescent lamps. The Triac is according to the power of the lamp.
This midrange filter for sound systems was found in the May 1988 issue of Radio Electronics...
The figure shows how to couple two TTL circuits using an optical coupler to obtain isolation. The...
This circuit can handle 25 A unde a 32 V voltage using a hight power old transistor. This...