Campfire simulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Campfire simulator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Home, household, hobby

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I bring to your attention a rather unusual design. Its purpose is a light and sound imitation of a fire flame or a fireplace hearth. Flickering flashes of garlands combined with chaotic crackling create the illusion of a burning fire.

The work is based on the widespread scheme for switching on a garland of lamps in series with a starter from fluorescent lamps. As you know, the starter consists of a housing, a capacitor and a gas-filled lamp with two thermal contacts. When a voltage equal to the voltage of the occurrence of an electric discharge in the lamp is applied, a discharge appears through the gap between the contacts of the lamp. Current flows through the starter.

According to the Joule-Lenz law

Q=I²Rt

the amount of heat released in the path of current flow depends on the resistance and the duration of the current. When discharging through a gas gap, the resistance will be large, as a result of which the thermal contacts are heated and, under the influence of temperature, are deformed so that they touch each other. The discharge stops as the contacts close. The resistance of closed contacts is low and they cool down. The time the contacts are in the closed state is determined by the time they cool down. After cooling, the contacts open. If you apply voltage again, the process will repeat. When the starter is turned on in series with a garland of lamps, the frequency of their inclusion is random.

This feature of the starter is used in the described simulator, the circuit of which is shown in the figure.

(click to enlarge)

When connected to the network, positive half-waves begin to charge the capacitor C3 through the resistor R2 and the diode VD1. Upon reaching the ignition voltage of the thyratron VL3 on the capacitor C1, C3 is discharged through VL1 and the telephone capsule BF1 - a click is heard. When the contacts of the starter VK1 are closed, the voltage on the lamps HL1 ... HL5 increases sharply, they light up. At the same time, through the integrating circuit R1, C2, a positive pulse arrives at the control electrode of the thyratron VL1, which can open the thyratron before the voltage at its anode reaches the ignition voltage of the thyratron.

Since the charge time of the capacitor C3 is constant and the voltage across it increases at a constant rate (sawtooth signal), the energy transferred to BF1 is directly proportional to the period of the pulses that open VL1. Since the starter turn-on period is random, the duration and volume of clicks in BF1 will also be random. The more often the lamps blink, the more often and quieter the crackles will be and vice versa, the less often the flashes, the louder the clicks will be.

Establishment The device consists in selecting the value of the resistor R2 until an acceptable volume of BF1 clicks is obtained. The capacitance of the capacitor C1 changes the switching frequency of VK1 within a small range. The larger the capacitance C1, the lower the frequency will be. If desired, one or two more garlands with starters can be included in the circuit by connecting them in parallel to VK1 and HL1 ... HL5 (VK2 and HL6 ... HL10).

Details: thyratron VL1 - МХТ-90; all resistors MLT-0,5; capacitors C1, C2 of any type with an operating voltage of at least 400 V; capacitor C3 with an operating voltage of at least 250 V; telephone capsule TK-67 with a coil resistance of 60 ohms. Incandescent lamps HL1 ... HL5 and HL6 ... HL10 - KM 60-50 or other bulbs for a total voltage of 300 V. Starter - any from fluorescent lamps with a power of 20 ... 80 W.

Author: S.Rychikhin, Sverdlovsk region, Pervouralsk

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