Vital electronic time delay circuit

Details Vital electronic time delay circuit Vital electronic time delay circuit

H - Electricity

03

K

328/89

H03K 17/28 (2006.01) H01H 47/00 (2006.01) H03H 11/26 (2006.01)

Patent

CA 1155185

(Case No. 7043) ABSTRACT OF THE DISCLOSURE A fail-safe electronic time delay circuit for providing a predetermined time delay period having an emitter-follower amplifier connectable to a source of recurrent signals, a voltage doubling rectifier for rectifying the amplified recurrent signals and for charging a capacitor which powers a tickler coil transistor oscillator, a pair of complementary switching transistors which are alternately rendered conduc- tive by the a.c. oscillations of the transistor oscillator, a rectifier having a capacitor which is charged when one of the pair of complementary switching transistors is conductive and which is discharged through a vital relay when the other of the pair of complementary switching transistors is rendered conductive.

365610

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