Found in 90s Popular Electronics, this circuit uses common general-purpose transistors in a configuration that has been extensively explored on this site and in our articles.
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
This circuit is from an1966 General Electric documentation. The Triac can be equivalent to 6 A or...
This circuit uses a PLL4046 oscillator to excite a piezoelectric ceramic. The circuit is from an...