Strobe Alarm

Posted on Jan 29, 2013

This strobe gives a visual indication of a sensor input. The input signal causes Ul, a light dependent resistor, to chaijge CI

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and C3 through R4. When NE1 fires, C3 discharges into SCR1, which triggers it and causes C2 to discharge through trigger transformer Tl, which triggers Flashlamp FL1, The 330-V supply should have about 50 to 100 /iF output capacitance. Ll supplies about 25-mH inductance to prolong the flash and the life of FL1.

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