Two-color network indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network, uninterruptible power supplies
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The proposed network voltage indicator circuit (see figure) uses a multivibrator on transistors T1 and T2 of any type with a gain of more than 50. Rectifier diodes D1 - D4 (for example, 1N4001).
The voltage on the smoothing capacitor C2 should be 12-15 V. Capacitors C3, C4 with an operating voltage of 16 V, their capacitance determines the flickering frequency of the LEDs -1,2 Hz.
Care must be taken when mounting and servicing the indicator, as its elements are under the mains voltage of 220 V.
Capacitor C1 must withstand a voltage of at least 400 V.
Author: Ya.Belz
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