Title: Protective circuit for transistor amplifier

Abstract: A protective circuit for a transistor amplifier is disclosed which includes a load impedance detecting circuit provided between an output terminal of a transistor amplifier and a load terminal, a circuit for detecting an abrupt surge voltage of a voltage source for the amplifier and a muting circuit are provided between an input terminal of the amplifier and a reference point, the muting circuit being operative to limit an input signal applied to the input terminal of the amplifier in response to output signals of the load impedance detecting circuit. A protective circuit having a thermal sensing circuit for detecting a temperature rise of an output transistor above a predetermined level which shuts off the amplifier is described as one embodiment.

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Inventors: Suzuki, Tadao (Tokyo, JA)

Application Number: 486319
Filing Date: 1974-07-08
Publication_date: 1976-01-27
Assignee: Sony Corporation (Tokyo, JA)
Primary Class(es): 361/91.1 330/207P, 361/79, 361/106
Other Classes:
US Patent Ref:

3493878	Feb, 1970	Fautale	330/207.
3522480	Aug, 1970	Routh et al.	317/41.
3555358	Jan, 1971	Gibbs	330/207.
3646397	Feb, 1972	Ruthenberg et al.	317/41.
3681659	Aug, 1972	Suzuki	317/31.
3703679	Nov, 1972	Heidt	317/33.
3731153	May, 1973	Nishimoto	307/202.
3792313	Feb, 1974	Conrad	317/36.
3794858	Feb, 1974	Squiers	317/36.

Other Refs:
Primary Examiner: Shoop, William M.
Assistant Examiner: Salce, Patrick R.
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson