100W OU Radiant Energy Circuit

[tihomir]

I have managed to find the problem. It was a wrong connection on the breadboard. Now it oscillates with a backward-connected transistor (without the base, which in my case is a 15 V threshold) or with a Zenner diode (5 V) at 50% duty cycle at the 5 MHz range. The DC power supply shows 5 V at 20 mA which means it eats all the current I'm giving it.

BTW: Is it possible to create an oscillator with a short duty cycle without using a 555 timer or any other IC component? Just basic components. I don't think the flyback oscillator circuits use a short duty cycle, because they oscillate, they don't create pulses.
(end of BTW)