Automatic switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Leaving the apartment in the evening, turn off the light and make our way to the exit in the dark. Returning home, in the dark we are looking for a switch.
The proposed version of the circuit breaker, the electrical circuit of which is shown in the figure, will help to get rid of such inconveniences. It turns off the light a minute after turning off the switches SA1 and SA2 and turns it on for the same time when the electric bell button SB1 is pressed.
The machine consists of a thyristor VS1 connected in parallel with switches SA1 and SA2. The thyristor control circuit consists of a diode VD1, a capacitor C1, resistors R1, R2, a diode VD2 and a resistor R4.
Electric lamp EL1 is switched on by switches SA1 and SA2. When leaving the apartment, one of the switches is turned off, while the capacitor C1 is charged and the thyristor VS1 turns on, the lamp is powered by a reduced voltage. Then turn off the second switch, and the lamp continues to shine for another minute. This is enough time to get out and close the door. When returning, you must press the button SB1 of the electric bell, the capacitor C1 is charged through the diode VD2 and the resistor R4, the thyristor VS1 turns on, and the lamp EL1 starts to shine. The apartment includes switches SA1 and SA2.
Details. Capacitor C1 type K5035 100 μFCh250 V, thyristor VS1 KU201L, resistors - MLT-0,5. The automatic switch does not need to be adjusted. If it is necessary to increase the lamp glow time, increase the capacitance of the capacitor.
Author: V.F. Yakovlev
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