Garland switch. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Garland switch. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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The device is designed to obtain the effect of "running lights".

Fig.1 (a, b) (click to enlarge)

The circuit contains a multivibrator, made on the relay K1, and a relay trigger with a counting input, made on the relays K2 and K3. The device works as follows. When the power is turned on, the capacitor C1 is charged through the resistor R1 and the diode V1. When a certain voltage is reached, relay K1 is activated and with its contacts K1.1 shunts part of the charge circuit. The capacitor is discharged through the relay winding, and when the relay release current is reached, contacts K1.1 will open and the cycle will repeat. The duration of the relay multivibrator pulses is determined by the capacitance of the capacitor C1 and the resistance of the relay, and the duration of the pauses is determined by the capacitance of the capacitor C1 and the resistance R1, by changing the value of which you can set the same duration of the pulses and pauses of the multivibrator.

The second group of relay contacts K1 (K1.2) controls the trigger. After the relay K1 is activated, its contacts K1.2 are connected to the power supply of the relay K2, which is self-locking by the contacts K2.1 through the closed contacts K3.1. After the relay K1 is released, the changeover contact K1.2 connects to the power supply the relay K3, which is self-locking by the contacts K3.1. In this case, relay K2 remains energized. Upon subsequent operation of relay K1, contacts K1.2 turn off diodes V2 and V3, and relay K2 is de-energized, and relay K3 remains on through closed contacts K1.2 and K3.1. When relay K1 is released, its contacts K1.2 will disconnect relay K3 from the power source and the device will return to its original position.

Details. Relay type RES-22; resistor type MLT-2; capacitor type K53-6.

To obtain the effect of "running lights", garlands designed for a voltage of 220 V are connected to the free contacts of the relay as shown in Figure b.

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