Clipping indicator circuit for transistor amplifier

Details Clipping indicator circuit for transistor amplifier Clipping indicator circuit for transistor amplifier

1977-06-29

1978-05-16

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

330 59, H03F 1700

Patent

active

040901467

ABSTRACT:
A light-indicator circuit is disclosed which permits visual indication of clipping caused by the over-driving of a transistor amplifier. The circuit includes a light-emitting diode connected in parallel with the collector-emitter path of a switching transistor which is biased to conduct during low-signal-level operation of the amplifier. The switching transistor is caused to switch to its non-conducting state when the amplifier is overdriven, thereby activating the light-emitting diode. Means may be provided to delay switch-back once activation of the light-emitting diode has occurred. Means may be provided to inhibit activation of the circuit by over-driving signals of limited duration.

REFERENCES:
patent: 3953806 (1976-04-01), Veranth

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