This circuit for incandescent lamps was found in the February 1972 Radio Electronics magazine. The triac is rated according to the lamp power and the sensitivity adjustment is made in R1.
This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is...
Suggested by an old American documentation the circuit below keeps a battery charged and at the...
Found in National Semiconductor documentation from the 1990s, this circuit has a 10 kHz pass band...