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.
The output voltage is adjusted by the trimpot. The power transistor mist be mounted on a heatsink. The 3.9...
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
The previously mentioned versions of monostable multivibrators in this section are not...