12_V_STROBOSCOPE

Published:2009/7/14 1:37:00 Author:May | From:SeekIC

Diode Dl is a polarity-protection device that can be omitted. A 555 is used as an astable with a frequency of about 0.7 kHz. When T1 is on, a current flows through the 6-V winding of TR1. When the collector voltage of T1 is nearly 0, the potential at the anode of D2 must be negative. When T1 becomes reverse-biased, its collector voltage rises to about 12 V and the potential at the anode of D2 must then be positive so that C4 can be charged Never operate the converter without a load. It is, perhaps, advisable to shunt C4 with a 100-kΩ, 1-W resistor. The converter charges C4 to about 300 V. This causes a potential at junction R6-05 of about 100 V. The neon lamp then comes on, so a gate current flows into the thyristor. This comes on and clears the way for C5 to discharge through TR2.This starting transformer produces a secondary voltage of a few thousand volts. This is sufficient for the xenon tube to strike and at the same time discharge C4. Then the operation can start again. The circuit draws a current of about 250 mA, but this depends on the flashing rate and the type of xenon tube.



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