capacitive relay. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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Security alarm,. switches for household appliances, control sensors on the production line - these are just a small part of the scope of this capacitive relay. It can be used, for example, in the simplest household automation: sat in an armchair - a floor lamp turned on, music started playing, a fan started, etc. In a word, the scope of this relay will be prompted by fantasy, the creative thought of the radio amateurs themselves.
The range of the relay depends on the accuracy of the setting of the capacitor C1, as well as on the design of the sensor. The author has the maximum distance to which the relay reacts is 50 cm.
Coil L1 is wound on a multi-section polystyrene frame from the circuits of transistor radios and contains 500 turns (250 + 250) with a tap from the middle of the PEL-0,12mm wire. Winding - in bulk.
The sensor is installed perpendicular to the PCB plane. It is a piece of insulated mounting wire with a length of 15 to 100 cm, or a square made of the same wire, with sides from 15 cm to 1 m.
Capacitor C1 - type KPK-M, the rest - type K50-6. RES-10, passport RS4.524.312 is selected as a relay, you can also use RES-10, passport RS4.524.303, or RES-55A, passport 0602. Diode VD1 can be excluded, since it is only necessary to protect the circuit from accidental polarity change nutrition.
The capacitive relay is configured with capacitor C1. First, rotor C1 must be set to the minimum capacity position. relay K1 will operate. Then the rotor is slowly turned in the direction of increasing capacity until relay K1 is turned off. The smaller the capacitance of the tuned capacitor, the more sensitive the capacitive relay and the greater the distance at which the sensor is able to respond to the object. When setting up the capacitor, the body case and the hand with a dielectric screwdriver must be kept as far away from the board as possible.
Author: V.Tabunshchikov, Novosibirsk; Publication: cxem.net
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