This circuit of an Electronics Hobbyists Handbook uses a different configuration for a triac. The circuit uses an integrated frequency divider and a coupler with a fotodiac.
This filter can be used to eliminate hum in sound equipment. Operational amplifiers can be 741 and...
Found in 90’s English documentation, this rising and falling siren, manually activated, drives a...
This sensor works as an electronic push button, activating a power relay. The circuit must be...