Nice in the dark frosty evening to sit by the radiant heat of the heater. But it becomes more comfortable when in it, like in a real fireplace, flickering “flame” and crackling “wood”. However, the industrial designs, simulation of burning firewood slowly, and all attempts to improve the installed impeller foil give only partial improvement results.
Noticeable effect can be achieved using electronic devices that simulate the burning and crackling wood in the fireplace. The scheme is simple, performed on the available element base and can be easily repeated.
The device consists of a generator of “white noise” amplifier, frequency divider, host light source control simulator “crack” of wood and power supply.
The generator of white noise, assembled on the transistor VT1, resistors R1 — R6, diode VD1, capacitors C1 — C3, produces a signal, the amplitude and frequency of which randomly change. This signal is supplied to the level control (variable resistor R7), and further the findings 12 and 13 of k176ie12 circuit. Feature of application of this IC is that its generating part performs the functions of audio amplifier. In the chip amplified signal is supplied to the frequency divider, which is every 256 pulses alternately switches the level logical 1 at the outputs T1 — T4. The positive voltage pulses from these outputs through resistors R9 — R12 are received in the same sequence to the control electrodes of the SCRs VS1 — VS4, open them, causing sequential ignition of the lamp HL1 — HL4 installed in the heater behind a decorative panel with an image of wood. With the conclusion of 6 DD1 signal is sent to the simulator of the crackling wood, performed on the transistor VT2, resistors R13 — R15 and phone BF1.