@▷ 3-6V Xenon Strobe Light by IC 555 and IRF9Z20 | Diagram for Schematic

3-6V Xenon Strobe Light by IC 555 and IRF9Z20

This circuit used to come as a kit from a surplus supplier, but probably isn’t available anymore. It shows a few novel concepts such as using a 555 as a pulse width modulator (PWM), and series/parallel camera flash transformers.
The 555 is set up as a pulse width modulator (the off (low) time being set by the trimmer). The output at pin 3 is connected to the gate of the P-channel MOSFET (IRF9Z20) through the 100R resistor to prevent parasitic oscillation of the transistor. A low signal at pin 3 causes the MOSFET to turn on, thus the potentiometer controls the output power, and somewhat the flash frequency, by varying the duty cycle of the 555 and in turn the MOSFET.

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http://silenceisdefeat.org/~lgtngstk/Sites/tls.html

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