This circuit is from an ancient American documentation. The transistors are of the time and the circuit uses a special sensor to detect the trigger point to produce spark plugs.
This application circuit for the AD6521C was found in Radio Electronics from the 90's. The circuit...
This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms...
This circuit was found in a 1967 Electronics World. SCRs are according the controller load,...