Coin telephone monitor circuit

Details Coin telephone monitor circuit Coin telephone monitor circuit

1980-06-02

1982-04-20

Brown, Thomas W.

1791752C, H04M 322, H04M 1702

Patent

active

043261035

ABSTRACT:
A circuit which monitors a coin telephone for coin ground, coin collect, coin return, stuck coin and ground fault conditions. Hall effect devices are used to detect the status of these conditions and to provide isolation between the coin telephone line and the coin telephone monitor circuit.

REFERENCES:
patent: 3456081 (1969-07-01), Pharis et al.
patent: 4166928 (1979-09-01), Sabon
patent: 4206321 (1980-06-01), McElliott

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