Modern air conditioners can be programmatically modified support them temperature. Option simplest heat stabilizer having a similar mode, presented in "Radio", 1999, No. 1, pp. 36, 37. The article described generator speed changing voltage, which can be embedded virtually any thermal stabilizer and provides four levels maintain the temperature. Do not exclude that Amateurs will find another the use of such generator.
Diagram of the device shown in the figure. The frequency of the oscillator pulses on the elements DD1.1-DD1.3 single RC-circuit, switchable multiplexer DD2.1, which, in turn, is controlled by the DD3 counter, working from the pulse generator. The multiplexer DD2.2 operates synchronously with DD2.1 alternately outputs the voltage divider R6-R11.
When power is differentiating circuit С6R5 generates a pulse of positive polarity sets the counter on the chip DD3 to zero. Low levels the counter outputs go to inputs 1 and 2 chips and DD2 to the enable input a pulse generator. In the multiplexer DD2 are connected to the inputs-outputs X and X0, Y, Y0. The output device receives voltage with engine resistor R7.
Starts working generator on the elements DD1.1-DD1.3. The period of pulses at its the output is determined by the resistance of the resistor R1 and the total capacity of capacitors C1 and C2. After a time corresponding to 32 periods of the pulses, output 2 counter DD3.2 appears a high level. Begins second phase operation of the device. The output enters the voltage with engine resistor R8, and the period the pulse generator is determined by the resistance of the resistor R2 and the sum of the capacity capacitors C1 and C3.
So formed will be four phases of operation of the device, each of which has its duration and the voltage level at the output Y of the multiplexer DD2.2. After the end of the fourth phase at the output 8 of the counter DD3.2 will be high the level that will prohibit the operation of the generator, and can also be used for signaling the end of the process. If entry 1 of the element DD1.1 disable output from the meter and connect the common wire, the loops of the four phases will continue before turning off the power.
The capacitance of the capacitors C1-C5 can be selected in the range from 20 pF to 2 µf, and the resistance of resistors R1-R4 10 kω to 10 Mω. Therefore, relevant the choice of these elements can be obtained the relationship of durations of the phases, reaching to 10 9 , which is more than enough in all practical cases. For most applications the number of timing capacitors can be reduced, but it is important so one of them must be connected in place of C1. Resistors R1-R4 can to be variable or adjustable, which makes it possible to change the program.
If the heat stabilizer output of the generator to connect to one of the inputs of the comparator to the second input of which is connected thermoresistive divisor), the temperature can be maintained under the program, which has four steps. Especially useful it may be in electric oven - some meals which taste is not forgotten, require in the preparation of change temperature on some software. The temperature sensor has to serve the thermocouple.
Modern air conditioners can be programmatically modified support them temperature. Option simplest heat stabilizer having a similar mode, presented in "Radio", 1999, No. 1, pp. 36, 37. The article described generator speed changing voltage, which can be embedded virtually any thermal stabilizer and provides four levels maintain the temperature. Do not exclude that Amateurs will find another the use of such generator.
Author: S. Biryukov, Moscow