Volume controlled tape end alarm for tape recorder

Details Volume controlled tape end alarm for tape recorder Volume controlled tape end alarm for tape recorder

1977-12-15

1979-04-03

Wolff, John H.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 74, 360 79, 360137, 340259, 340675, 360 741, G11B 1506

Patent

active

041480813

ABSTRACT:
A volume controlled tape and alarm for a tape recorder is disclosed. The tape end alarm is coupled between a microphone and an audio amplifier and includes an automatic gain control circuit for maintaining a constant recording level, an oscillator for generating an audio frequency signal, and a variable volume control resistor for coupling the output of the oscillator circuit to the automatic gain control circuit. The volume of the audio alarm signal can be adjusted by adjusting the position of an externally adjustable knob connected to the variable resistor.

REFERENCES:
patent: 3497635 (1970-02-01), Schneider
patent: 3562441 (1971-02-01), Bretschneider
patent: 3566132 (1971-02-01), Walker
patent: 3660810 (1972-05-01), Yoshii
patent: 4003093 (1977-01-01), Satoh
patent: 4005486 (1977-01-01), Satoh

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