Shoe dryer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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After a ski trip or a long walk in the autumn thaw, shoes often get wet through. Upon returning home, they rush to dry it, given that it will soon be needed again. And here it is important to take care that your shoes do not dry out during drying, otherwise they will lose their shape and become covered with cracks.
In order not to waste time on systematic checks of the condition of shoes, it is better to entrust this matter to the machine. The controlled parameter can be the electrical resistance of the shoe material, which, depending on humidity, varies from hundreds of ohms (in the wet state) to tens of kOhms and higher (in the dry state). The control functions will be successfully performed by the device, the diagram of which is shown in the figure.
On the DD1 chip, consisting of several 2I-NOT logic elements, two generators of electrical oscillations are assembled, differing from each other only in the switching frequency. On the elements DD1.1, DD1.2, a generator with a switching frequency of approximately 1 Hz is assembled. Its output signal is amplified by a transistor power amplifier VT1 and then used to drive the HL1 LED. The generator on the elements DD1.3, DD1.4 generates audio frequency oscillations, which, after amplification by an amplifier on a transistor VT2, are fed to the dynamic head BA1.
The first oscillator is connected to the controlled resistance Rx. It performs the functions of the master and determines the mode of the second generator. Input 2 element DD1.1 through resistor R2 is connected to the midpoint of the voltage divider formed by resistor R1 and resistance Rx. While the shoes are wet and the Rx resistance is low, a low voltage is present at input 2 of DD1.1, which is why the generator is blocked. The voltage at the output of element 4 DD1.2 also has a low level. The work of the second generator is blocked in the same way. In this case, the transistors VT1, VT2 are closed and do not consume current from the battery GB1.
When the shoe dries up and its resistance Rx increases, the first generator will start to work, which will be indicated by the blinking of the HL1 LED. At the moments when a high level voltage is present at the output 4 of the DD1.2 element, the second generator will start working. An audible signal will appear at its output. Under its influence, the BA1 emitter will sound. The current consumed by the emitter head limits the resistor R8. With the help of resistor R1, the resistance level Rx is set at which the device should work.
Two flexible strips of stainless metal can be used as X1 probes, which are pressed against the inner walls of the toe of the shoe with paper stuffing, thereby helping to maintain the shape of the shoe. If necessary, by selecting the capacitance of capacitor C2, the maximum sound volume of the emitter is achieved.
It is recommended to use fixed resistors MLT-0,125, variable SP-0,4, capacitors KLS (C2) and K50-6 (C1) in the device. Power switch - MT1 or PDM1 series. The sound emitter is a dynamic head 0.25GDSH-7 with a voice coil resistance of 50 ohms. A telephone capsule with the same or slightly higher resistance will also work. Power supply - Krona battery or two 3R12 batteries connected in series. To avoid accelerated self-discharge of the galvanic source while drying shoes, it should be kept away from the heater.
Author: Yu.Prokoptsev, Moscow
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