Timer circuit

Details Timer circuit Timer circuit

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G04F 1/00 (2006.01) G04F 5/00 (2006.01) G04G 15/00 (2006.01) H03K 17/28 (2006.01) H03K 17/292 (2006.01) H04B 1/16 (2006.01)

Patent

CA 1143954

S01300 S80P59 TIMER CIRCUIT ABSTRACT OF THE DISCLOSURE A timer circuit for connecting a DC voltage source to an electric device, such as a small portable radio, compri- ses a switching device, such as a switching transistor, con- nected between the source and the device and having conductive and non-conductive states; a drive circuit operative to selec- tively establish the states of the switching device in response to a control voltage; a timing circuit for holding a voltage level that initially decays at a first decay rate from a first voltage related to the voltage of the source of a second voltage, and subsequently decays at a second, different decay rate from the second voltage to a third voltage; and a control device, which may be a thyristor, such as, a programmable unijunction transistor, or a thyristor-like circuit, for providing the con- trol voltage to a drive circuit to cause the latter to esta- blish one of the states of the switching device when the voltage level of the timing circuit is above the third voltage, and to establish the other of the states when the voltage level has decayed to the third voltage.

351591

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