Door touch bell. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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Relay K1 is included in the anode circuit of the thyratron (RES6 passport RFO.452.103), a group of normally open contacts of which is connected in parallel with the self-locking contacts of the musical bell relay (or a regular apartment bell is fed through these contacts). To exclude false alarms of the sensor device and spontaneous ignition of the thyratron, a parametric voltage stabilizer was introduced, made on the VD1 zener diode and a short-circuit ballast resistor. The constant supply voltage of 170 V remains unchanged when the mains voltage fluctuates from 180 to 250 V.
Sensor E1 in the form of an aluminum rivet, resistor R1 (it can be from 1 to 10 MΩ) and a thyratron are placed in a small case mounted on the front door from the outside. A hole was drilled in the housing opposite the thyratron to control the sensor operation. At the moment the button-rivet is touched, the thyratron flashes brightly.
Establishing a sensor device is reduced to setting a variable resistor R5 voltage of 170 V on the oxide capacitor at a minimum mains voltage (180 V) - this voltage can be applied, for example, from an autotransformer.
Attention! Connect the adjusted device to the network in strict accordance with the diagram after determining the neutral and phase wires.
Literature
1. "Door sensory bell" - Radio No. 1-82, p.54.
Author: A. Urmilov, Novgorod-Volynsky, Zhytomyr region; Publication: N. Bolshakov, rf.atnn.ru
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