This circuit was obtained from an American documentation from the 1980s. The T1 triggering transformer must provide 250 V pulses for the lamp to trigger.
This 4.5 MHz oscillator, or according to the crystal, was found in American documentation from the...
Exciting buzzers we have the circuit of the figure, which has a modulator by interruption, with a...
We found this circuit in the February 1984 issue of Radio Electronics magazine. It uses an...