The switch of garlands on the relay. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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The garland switch on the relay is designed to get the effect of "running lights" on the Christmas tree.
The device consists of a relay multivibrator and a relay trigger with a counting input.
The relay multivibrator is made on the K1 relay. When the power is turned on, the capacitor C1 begins to charge through the resistor R1 and the diode V1. At a certain voltage on the capacitor, relay K1 is activated, the contacts K1.1 of which close part of the charge circuit. Now the capacitor C1 begins to discharge through the winding of the relay K1 (diode V1 prevents the capacitor from discharging through other circuits). When the capacitor discharge current reaches the release current of the relay, contacts K1.1 will open and the cycle will repeat.
The duration of the charge of the capacitor depends on its capacitance and the resistance of the resistor R1, and the duration of the discharge depends on the capacitance of the capacitor and the resistance of the relay winding K1. The same duration of the charge and discharge of the capacitor, i.e., the same duration of the pulses and pauses of the multivibrator can be set by selecting the resistor R1.
The second group of relay contacts K1 (K1.2) is used to control the trigger assembled on relays K2 and K3. When the capacitor is initially charged, the windings of these relays are de-energized. After the relay K1 is activated, its contacts K1.2 are connected through the closed contacts K3.1 the winding of the relay K2 to the power source. Relay K2 is activated and self-blocking by contacts K2.1 through closed contacts K3.1.
After releasing relay K1, its contacts K1.2 return to their original position (shown in the diagram) and turn on relay K3 through diode V2.1 and closed contacts K3, which self-locks through contacts KZ.1. In this case, relay K2 remains energized, since it is now connected to a power source through diode V2.
Upon subsequent operation of relay K1, contacts K1.2 disconnect diodes V2 and V3 from the power source. Relay K2 is de-energized, and relay K3 remains energized - it is connected to a power source through closed contacts K1.2 and closed K3.1.
When relay K1 releases again, its contacts K1.2 disconnect the short circuit relay from the power source and the device will return to its original position.
The switch uses a RES-22 relay (passport RF4.500.129), a resistor - MLT-2, a capacitor - K53-6. Diodes can be D7Zh, D220 or D226 with any index. The power source can be a battery with a total voltage of 9-10V or a rectifier designed for the same voltage at a load current of up to 0,5 A.
With this switch, it is easy to get the effect of "running lights" if you connect the lamps of the garlands in series and arrange them as shown in the figure.
The number of lamps in each garland is determined by their parameters and mains voltage.
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