Garland switch on one trinistor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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A garland switch on one SCR for one garland can be assembled according to the following scheme (Fig. 1).
Ris.1
Resistors, an electrolytic capacitor and a trinistor make up a closed cell that works "for itself".
Elements R1C1 form a timing chain. At the initial moment after the device is turned on, the trinistor is closed and the H1 garland is off. Capacitor C1 is charged through resistor R1, and at a certain voltage across it, the trinistor opens. The garland lights up, at the same time the capacitor is discharged through a resistor and an open trinistor. The trinistor closes, the garland goes out again. The process is repeated.
A garland is made up of series-connected lamps with a current consumption of not more than 0,4 A. At a higher current, a V2 diode should be installed more powerful, for example D242B, and also KU202L (M, N) trinistors should be used.
With a slight improvement in the circuit, you can use a switch for two garlands with adjustable glow duration (Fig. 2).
Ris.2
Complete extinction of each garland during a pause can be achieved if the H1 garland is selected with a significantly higher current consumption.
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