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If you still wonder how it works well it is a darlington pair means that it has a very high beta or Hfe or gain factor and a coil is soldered to the base of the transistor so that it acts as a capacitor(even aluminium foil will work).
If you still wonder how it works well it is a darlington pair means that it has a very high beta or Hfe or gain factor and a coil is soldered to the base of the transistor so that it acts as a capacitor(even aluminium foil will work).