Flasher on an incandescent lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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This simple device contains few parts, and most of them (transistor, dinistor, diodes) can be removed from the electronic ballast (electronic ballast) of a failed energy-saving compact fluorescent lamp (of course, these elements must be serviceable). It is designed to work with an incandescent lamp for a voltage of 220 V with a power of up to several tens of watts.
Several of these devices, especially if they flash in different colors, will decorate a home party, disco, Christmas tree, etc.
Fig. 1
The scheme of the flasher is shown in fig. 1. It consists of a bridge rectifier on diodes VD1-VD4, a relaxation oscillator assembled on a symmetrical dinistor Vs1 and elements R1, C1, and an electronic switch on a transistor VT1 in the power supply circuit of an incandescent lamp EL1. Resistor R2 - current limiting. After connecting to the network, charging of the capacitor C1 begins, and when the voltage across it becomes equal to the opening voltage of the dinistor VS1, the capacitor quickly discharges through the resistor R2 and the emitter junction of the transistor VT1. Opening, it connects the EL1 lamp to the rectifier and it flashes.
The duration of the flashes depends on the capacitance of the capacitor C1 and the resistance of the resistor R2, and the period of their repetition depends on the capacitance of this capacitor and the resistance of the resistor R1 (with the ratings indicated in the diagram - several seconds). In other words, these device parameters are interconnected.
Reducing the resistance of the resistor R2 leads to a decrease in the duration of the flash, but if it turns out to be too short, the lamp filament will not have time to warm up. In addition, the resistance of the resistor R2 must be at least 24 ... 30 ohms, otherwise the dinistor and transistor will work in excess of the maximum allowable current.
Fig. 2
All parts of the flasher are mounted on a printed circuit board (Fig. 2) made of foil fiberglass with a thickness of 1.1,5 mm. Resistors - any small-sized (MLT, R1-4, C2-23), capacitor - imported oxide. To connect a halogen lamp with pin terminals (for example, in a GU4 package or similar), sockets XS1 and XS2 are soldered on the board directly to the printed conductors (from a 2PM connector or another suitable one). The appearance of the mounted board with such a lamp is shown in Fig. 3.
Fig. 3
Since all elements are galvanically connected to the network, the device is placed in a transparent plastic case of suitable dimensions. Having painted it with a colored transparent varnish, you can get a flasher of the corresponding color.
In conclusion, it should be noted that the pulsed operation of incandescent lamps reduces their service life, so do not be surprised if the flasher stops flashing before the end of the warranty period for the lamp installed in it.
Author: I. Nechaev
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