tricky circuits

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Across
  1. 2. another name of a coil or choke,
  2. 6. an circuit that superimposes a low-frequency signal onto a high-frequency signal
  3. 8. flow of charge
Down
  1. 1. a circuit which not only transforms current but also creates opposition to it
  2. 3. a device that converts variations in a physical quantity into an electrical signal
  3. 4. a field-effect transistor
  4. 5. device for increasing the amplitude of electrical signals
  5. 7. transistor that uses both electrons and electron holes as charge carriers