In the anode circuit of thyratron switched on relay K1 (RAS passport RIF.452.103), the group of the normally open contact of which is connected in parallel self-locking contacts of relay call music (or through these contacts nourish the usual bell housing). To eliminate false triggering of the sensor device and the spontaneous ignition of the thyratron, introduced a parametric voltage regulator, made in the Zener diode VD1 and the ballast resistor circuit. DC supply voltage 170 To remain unchanged when mains fluctuations from 180 to 250 V.
Sensor E1 in the form of aluminum rivets, resistor R1 is the resistance from 1 mω to 10 Mω) and the thyratron is placed in a small housing mounted on front door outside. To monitor the sensor response in front of the thyratron in the housing of the drill hole. At the moment of touch "button-rivet thyratron flashes brightly.
Establishing a touch-enabled device is to install a variable resistor R5 of the voltage 170 In oxide on the capacitor at minimum mains voltage (180 V) - voltage can be submitted, for example, with autotransformer. Attention! To connect established the device to a network, in strict accordance with the scheme after determining the zero and phase wires.
Literature
1. "Touch door bell".- Radio No. 1-g.,p. 54.
Author: A. Ermilov, Novgorod-Volynsky, Zhitomir region; Publication: N. Bolshakov, rf.atnn.ru