Electronic security memory including on-off controlled oscillato

Details Electronic security memory including on-off controlled oscillato Electronic security memory including on-off controlled oscillato

1980-11-21

1983-03-08

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331173, 331185, 340 38R, B61L 2922, H03B 512

Patent

active

043762697

ABSTRACT:
A security memory having a transistor oscillator with feedback, a power supply input, a control input, and an a.c. output as well as an amplifier. This memory designed in accordance with relay security standards, is of the negative control type, which stores the disappearance of a logic signal which is a function of at least one logic variable. To this end its control input is energized with a voltage whose absolute value is smaller than that of the supply voltage of the oscillator and is connected to the collector of the transistor via a diode, which collector in its turn is connected to a capacitor via a first transformer winding, which capacitor starts and sustains the oscillation.

REFERENCES:
patent: 3042870 (1962-07-01), Minner et al.

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