We found this circuit in the October 1987 Radio Electronics magazine. The circuit uses a 1-to-1 turns ratio pulse transformer to trigger the Triac.
This circuit makes use of an operational amplifier from the 80's. The circuit can be implemented with...
When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be...
Using the CK722 this directional photometer was published in Radio Electronics magazine in July...