Four-channel stroboscope. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music settings
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The figure shows a schematic diagram of a four-channel stroboscope. His lamps flash alternately, for a while in one sequence, then for a while in another. The flash frequency can be smoothly changed with a variable resistor R1. The design uses low-power flash lamps IFK-120 or IFK-80.
On the elements DD1.1, DD1.2, a generator of strobe pulses is assembled, which are fed to the corresponding input of DD2. The frequency of this generator can be smoothly changed by resistor R1. The second generator on the elements DD1.3. DD1.4 generates switching pulses to control DD2 inputs SR and SL.
The DD2 microcircuit is a shift register, and its switching circuit is such that with the arrival of the next clock pulse, a cyclic (in a circle) shift of the information recorded in the register occurs. The shift direction is set by a combination of signals at the inputs SR and SL. If at the input SR - logical 1 and at the input SL - logical 0, then there is a shift to the right, with opposite signals at the inputs - a shift to the left. Thus, the lamps HL1, HL2, HL3, HL4, controlled by signals from the outputs of the shift register DD2, will alternately flash. Automatic change of flash direction is carried out by the generator on DD1.3, DD1.4. Transistor VT1 is used to invert the generator signal. The control pulses from the DD2 microcircuit are fed through the capacitances C3, C4, C5, C6 to the transistor switches VT2-VT5, which control the high-voltage pulse transformers TR1-TP4.
Chips DD1, DD2 are powered by a stabilized +5 V power supply on the KR142EN5A chip. An unstabilized voltage of +10 V is supplied to the transistor keys. Protective diodes VD6-VD9 are included in the collector circuits of the key transistors.
The storage capacity C7 is charged from the mains ~ 220 V through a rectifier diode VD5 and a current-limiting resistor R15. The KH1 button is used to remove the residual charge from the capacitance C7 after finishing work with the stroboscope and when setting up. LED HL5 is designed to control the discharge of capacitor C7.
Transformers TP1-TP4 are manufactured independently. They are wound on ferrite rods with a diameter of 3 mm and a length of about 15 mm from 600NN grade ferrite. Winding I contains 20 turns of wire PEL-1 0.25. winding And contains 800 turns of wire PEL-1 0.07. Each winding layer is carefully insulated with capacitor paper. After manufacturing, the transformer can be immersed in molten paraffin, which will provide additional electrical insulation and fix the windings.
The TR5 power transformer can also be made independently, but any ready-made one with a power of at least 6 ... 8 W and an output voltage of 8 ... 12 V can also be used.
In the case when the lamps are mounted in separate housings, a pulse transformer that controls the ignition is placed directly next to the lamp. The length of the cable connecting the lamp and transformer unit to the control unit must not exceed 20 m.
When manufacturing, setting up and operating the device, precautions for working with high voltage must be observed.
Publication: cxem.net
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