Flame simulator for electric fireplace. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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It's nice to sit by the warm electric fireplace on a dark frosty evening. But it becomes even more comfortable when in it, as in a real fireplace, the "flame" flickers and the "firewood" crackles. However, in industrial samples, the imitation of burning firewood is weak, and all attempts to somehow improve the foil impellers installed in them give only a partial improvement in the result.
A tangible effect can be achieved with the help of an electronic device that simulates the burning and crackling of firewood in a fireplace. The scheme is simple, made on an accessible element base and can be easily repeated.
The device consists of a "white noise" generator, an amplifier, a frequency divider, a light source control unit, a firewood "cod" simulator and a power supply.
The "white noise" generator, assembled on a transistor VT1, resistors R1 - R6, a diode VD1, capacitors C1 - C3, generates a signal whose amplitude and frequency change randomly. This signal is fed to the level controller (variable resistor R7) and then to pins 12 and 13 of the K176IE12 chip. The peculiarity of the use of this IC is that its generator part performs the functions of an audio frequency amplifier. In the microcircuit, the amplified signal is fed to the frequency divider, which, every 256 pulses, alternately switches the logic 1 level at the outputs T1 - T4. Positive voltage pulses from the indicated outputs through the resistors R9 - R12 arrive in the same sequence to the control electrodes of the trinistors VS1 - VS4, open them, leading to the alternate ignition of the HL1 - HL4 lamps installed in the electric fireplace behind a decorative panel with the image of firewood. From pin 6 DD1, the signal goes to the firewood crackle simulator, made on the transistor VT2, resistors R13 - R15 and the phone BF1.
Schematic diagram of the electronic simulator (click to enlarge)
Since a signal is selected as a reference for the microcircuit, the amplitude and frequency of which change according to a random law, the flickering frequency of the lamps and the loudness of crackles will also constantly change, creating the effect of "burning firewood" in the fireplace.
The power supply on transformer T1, diodes VD3 - VD6, zener diode VD2, capacitors C5, C6 and resistor R16 is made according to the traditional scheme and does not need a description.
The simulator is assembled on a printed circuit board 112X92 mm in size, made of foil fiberglass 1,5-2 mm thick.
Device circuit board with component layout
When handling the K176 series chip, precautions should be taken to avoid exposure to static electricity. The soldering iron tip must be connected to the common wire of the device and grounded. First, pin 7 of the IC is soldered, then 14, then the rest of the pins.
Diodes: VD1 any of the series D2, D9, D18, VD3 - VD6 - any of the series D226. Trinistors KU201L, KU202L, M or others, designed for switching voltages of at least 300 V.
Resistors R1, R7 and R13 - SP4-1, R16 - MLT-0,5, the rest MLT-0,125. Capacitor C4 type KSO-2, oxide can be K50-6, K53-1, K53-4 and others.
The power transformer is made on the magnetic circuit Ш10Х20. Winding I contains 4500 turns of wire PEV-1 0,05; II - 250 turns of PEV-1 0,23. It is advisable to use low-power incandescent lamps, for example, 25 or 40 watts each. Phone - with a resistance of 50-200 ohms (for example, TM-4, TDK-1).
The adjustment of the device begins with a "white noise" generator, the characteristics of which depend on the properties of the germanium diode VD1. In parallel with the resistor R7, piezoelectric telephones or an oscilloscope are connected and the supply voltage is applied. If the generator does not work, try changing the polarity of the diode, install a transistor with a high current transfer ratio, or increase the supply voltage to 12 V (in the power supply, replace the zener diode with D815D). Next, resistor R7 sets the required signal level at pins 12 and 13 of the microcircuit, achieving the required frequency and brightness of the flickering of the lamps. Lastly, the "cod firewood" simulator is set up by adjusting the variable resistor R13 and selecting the value of the capacitor C4.
Author: A.Charkin
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