Detector

Details Detector Detector

1979-02-05

1981-01-13

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307264, 328150, 328149, 330280, H03K 5153

Patent

active

042451701

ABSTRACT:
A detector suitable for use in a recording amplifier of a cassette recorder for limiting the signal which is applied to the write head at a specific average amplitude. The detector comprises a pre-amplifier T1 to T4 having an input (15) and an output (17); a comparator (T6) having a first input (base) coupled to the output of the pre-amplifier, and a second input (emitter) for detecting whether a detection voltage at the second input is exceeded by the voltage on the first input of the comparator circuit; a reference voltage source (V.sub.ref); first means (4) for maintaining the d.c. level at the output of the pre-amplifier (T1 to T4) at the level of the reference voltage source (V.sub.ref); and second means (T10, T11) for raising the detection level of the comparator circuit by the reference voltage.

REFERENCES:
patent: 3719895 (1973-03-01), Van der Pulje
patent: 4143331 (1979-03-01), Page

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