CAPACITIVE INDICATOR Russian patent published in 1998 - IPC

FIELD: devices of projectiles responding to approach to and contact with outer bodies, in particular, fuses, devices for jettisoning of braking systems, applicable in alarm systems. SUBSTANCE: capacitive indicator has two insulated electrodes making up an input capacitance, which is shunted by the pulse oscillator key, connected via a resistor to the output of the feedback voltage amplifier and voltage comparator, whose output is connected to a two-input integrator connected via the second input to the power supply, and via the output series-connected to the threshold element and actuator, and to the input of the feedback amplifier via an lagging component, whose capacitor via one of the leads is connected to the power supply. At an approach of the electrodes to a body the input capacitance increases, which causes vanishing of comparator pulses. The voltage across the integrator grows and actuates the threshold element and actuator. At actuation operating voltage across the capacitor of the two-input integrator is set and maintained with the aid of the feedback circuit. EFFECT: simplified design, reduced cost, enhanced stability. 2 cl, 1 dwg