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The projectile lamp voltage stabilization circuit

2015-03-20 05:44  
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The projectile lamp voltage stabilization circuit
When the AC input voltage changes within 105~250v, the effective voltage on the bulb keeps at 100±2V. Behind the mirror of the 150W projectile lamp, there is a black light leakage tube. The red light emitted by the lamp reaches the LDR through the tube. The resistance change of the LDR is fed back to the igniting circuit Q1-Q2, which controls the conducting angle of the SCR Q3. The coverage of the mirror is big, so it can feel the light change caused by the 60Hz DC light regulation.