This circuit was found in a 1968’s General Electric documentation. The circuit uses components from that time.
Short pulses can be found in this 90's EDN circuit. The load is 50 ohms and the transistors are from that...
What we have is a powerful flasher that can be powered by voltages of 12 V like the one obtained from...
The Texas Instruments TPS80 LDO (Low Dropout) series (www.ti.com) can provide fixed or adjustable output...