Voltage regulator circuitry for a telephone answering device

Details Voltage regulator circuitry for a telephone answering device Voltage regulator circuitry for a telephone answering device

1978-08-04

1981-04-28

Cardillo, Jr., Raymond F.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318317, 318332, 318345B, 318432, 323280, 328267, H04M 165, G05F 144, H02P 700

Patent

active

042647851

ABSTRACT:
In a telephone answering device, a bistable circuit employing a single operational amplifier is used for mode switching and a voltage regulator using another operational amplifier provides regulated power to the recorder drive motor.
The voltage regulator uses the input terminal abrupt threshold characteristic of the operational amplifier as a voltage reference against which the output voltage is compared. The amplifier drives a transistor connected to series regulate the voltage to the load.

REFERENCES:
patent: 3517291 (1970-06-01), Carruth
patent: 3518519 (1970-06-01), Callan
patent: 3586779 (1971-06-01), Chernack
patent: 3780226 (1973-12-01), Jacobson
patent: 3855511 (1974-12-01), Smith
patent: 3909537 (1975-09-01), Jacobson
patent: 3935390 (1976-01-01), Winterhalter
patent: 4044287 (1977-08-01), Ratzel et al.
Hunter, "Handbook of Semiconductor Electronics", 3rd ed., McGraw-Hill, 1970, Section 17.4, pp. 17-35 to 17-50.

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