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.
We found this circuit in a 1967 Japanese technical magazine. The transistors are made of germanium at...
Using 4 operational amplifiers this circuit generates 4 different tones. The circuit is from an...
This circuit was found in the National Semiconductor's Linear Applications of 1978. The circuit uses...