Mounting regulator current has ballast transistor provided with a transistor accessory intended to limit the mean power dissipated in the ballast transistor

摘要

Circuit generating a current regule of substantially constant mean value from a supply voltage v ac straightened, comprising a ballast transistor t is biased by a reference voltage supplied by a zener diode z, characterizes by an auxiliary transistor t connected in series with the ballast transistor and biased by a voltage divider r, r is connected to the terminals of the supply voltage source v. the application to the excitation of the electro - light-emitting diodes.