Chopper transistor | Article about chopper transistor by The Free Dictionary
chopper transistor[′chäp·ər tran′zis·tər]
A bipolar or field-effect transistor operated as a repetitive “on/off” switch to produce square-wave modulation of an input signal.
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The disadvantage is the cost of the resistor and braking chopper transistor
. Additionally, the resistor must be caged and vented properly to prevent fires.