This dimmer for incandescent lamps using triac and an LF7237 IC was found in May 1985 Radio Electronics magazine. The circuit supports extension buttons.
The transistors are 2N918, 2N3464 and other RF equivalents of the time for Q1. For Q2, 2N3399, 2N2894...
This LED signaling circuit uses a programmable unijunction transistor (PUT) as a relaxation...
This is a commercial circuit from a Japanese publication from 1972. The circuit uses a FET that...