Touch pad arrangement for signalling arrivals in swimming compet

Details Touch pad arrangement for signalling arrivals in swimming compet Touch pad arrangement for signalling arrivals in swimming compet

1975-09-30

1977-02-01

Hohauser, Herman J.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

340323R, 273 86B, G08B 522

Patent

active

040063640

ABSTRACT:
A plurality of contacts, each comprising two electrodes, are arranged beh a plate to be used as a touch pad in a swimming competition timing device. Closing of a contact results in a signal being transmitted from a transistor to control electronic chronometric equipment. The contacts are connected in parallel and are coupled between the emitter and base of the transistor. The voltage across the contact is thereby held to the base-emitter voltage of the transistor, which is below the decomposition voltage of the electrodes. In a second embodiment, contacts are connected to either of two transistors which are in series to act as an "OR" circuit.

REFERENCES:
patent: 3363243 (1968-01-01), Morley
patent: 3544989 (1970-12-01), MacCreadie
patent: 3916214 (1975-10-01), Coble, Jr.

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