Ringing device for concentrators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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Telephone hubs, as well as old industrial telephone hubs such as KD-6 and KS-6, do not have a loud call, and therefore, when used in rooms with a high noise level, the call may not be heard. I have upgraded my hub, as well as many CD-6s, with a hands-free calling device with a regular phone call, which is included in place of the acoustic signal capsule.
The principle of operation of the device, the scheme of which is shown in the figure, is as follows. When a call arrives at its input, the transistor opens. A positive impulse of the collector circuit of the transistor opens the KU201K thyristor, and the bell starts working. The remaining parts form the simplest parametric stabilizer.
The bell and transistor are powered by alternating current from a separate step-down transformer. Since a non-sinusoidal voltage is supplied through the thyristor, the bell should be installed in a vertical position. The polarity of its inclusion is determined empirically.
Transistor MP16B can be replaced by MP26B. The thyristor can be replaced by KU202N. Resistor R2 - wire.
Author: A. Bely, Donetsk region, Artemovsk
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