This control circuit using a low voltage switch was found in the September 1987 Radio Electronics magazine. The triac must be matched to the load and the mains voltage.
The integrated circuit used in this amplifier is not common today. The power can be between 4 and...
We found this circuit in the Texas Instruments opto-electronics manual. The button resets and the...
This TTL circuit with the 7493 makes the binary count of the pulses sent by a flip-flop with the...