Film loop speed control circuit

Published:2011/4/5 22:21:00 Author:Nicole | Keyword: film, loop speed | From:SeekIC

Some movie projectors use a few watts current separator permanent magnet induction motor to drive film, this divided circuit is used to control the rotational speed of motor. When the light is not blocked by film loop, photosensitive resistance makes Q1 conductive. Divided circuit makes motor flip, and also control its speed, circuit elements numerical take: C2=0.01μF, D is IN4004, Q1 is 2N4987, Q2 is 106B, R1=300kΩ, R2=100Ω, R3=10Ω.



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