Fig. 1 Basic construction of a xenon flashtube.

Xenon Flash Tube Circuits Landing Page

by Lewis Loflin

This page has moved. See the following:

• Simple 12-14 Volt DC to High Voltage AC Inverter for Flashtubes
• Understanding Xenon Flashtubes and Circuits
• Unijunction Transistor SCR Photo Flash Control Circuit
• Understanding Unijunction Transistors Theory Operation
• Used with photo flash circuits:
• How to use SIDACs and Their Operation
• SIDAC Controlled Flashtube and Pulse Circuits YouTube
• DIAC Waveform Generator, Trigger Circuits Part 1
• DIAC Relaxation Oscillator Pulse Generator Part 2
• Neon NE-2 Lamp Trigger Photoflash

The original unijunction transistor types are now considered obsolete, but a later multi-layer device, the programmable unijunction transistor, is still widely available. The most common application of a unijunction transistor is as a triggering device for SCR's and Triacs but other UJT applications include sawtooth generators, simple oscillators, phase control, and timing circuits.

Related devices are the SIDAC and DIAC. Both are used in timing and control circuits for SCRs and TRIACs. DIACs and TRIACs are used in common lamp dimmers.

Both DIACs and SIDACs can be used to build relaxation oscillators. A SIDAC is a higher voltage version of a DIAC.

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