This circuit is from an American documentation from the 90's. The SCR can be of any type and the diodes must have current according to the controlled motor.
This flasher was found in an old Hands On, but uses common components. The optocoupler can be...
This circuit with output powers of 2 to 3 W depending on the power supply was found in the...
The L3 coil is what basically determines the resonant frequency, around 1 MHz, in this oscillator found...