Multi-state semiconductor tachometer circuit

Details Multi-state semiconductor tachometer circuit Multi-state semiconductor tachometer circuit

1975-04-11

1976-12-07

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307228, 307252J, 307246, 307283, 307233R, H03K 1728, H03K 1756

Patent

active

039964833

ABSTRACT:
A tachometer circuit in accordance with the invention has two or more output states dependent upon the frequency of an applied signal. The tachometer circuit is of the type comprising at least one time-measurement circuit having two discharge paths for a capacitor which forms part of a time-constant network. One of the discharge paths is controlled by the applied signal and the other path is caused to conduct after a predetermined time. In the circuit of the present invention the discharge path to which the input signal is applied includes a thyristor or like element with a high holding current which ensures a non-controllable discharge of the capacitor, and the other discharge path comprises a unijunction transistor or like element with a low holding current.

REFERENCES:
patent: 3033994 (1962-05-01), Fujimoto et al.
patent: 3372683 (1968-03-01), Phillips et al.
patent: 3567969 (1971-03-01), Goode et al.
patent: 3704382 (1972-11-01), Huntzinger

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