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Cooling fan control unit on the chip to 561 Re5

Usually to manage tiljatorom lazhdenija Oh veins when change thermostat diagram or on specialized integrated micro scheme, but more often on kompa Rathore or operational amplifier, comparator scheme enabled. But what if you don't have a comparator or OP AMPS, but there are digital CMOS chip with logical inverters? So it turns out no worse! Here cite a fan cooling Denia on the basis of the chip to 561 Re5, but it can be assemble and virtually any other chip to 561, to 176 or CD, in which there are no less than three logical inverters. In any case, all of the entrances of each element are joined together.

Датчик температуры – полупроводнико­вый терморезистор R2. Вместе с подстроечным резистором R1 он образует термо­зависимый делитель напряжения. При повышении температуры напряжение на его выходе снижается, потому что при повышении температуры снижается сопротивление полупроводникового терморезистора R2.

Comparator functions assigned to Schmitt trigger on logical inverters (D) 1.1 and 1.2 (D). As you know, Schmitt trigger is different because it has a very precise voltage thresholds logical unit and a logical zero. These Rapids and the work in this case as a reference voltage in circuits on the comparator.

The inverter D 1.3 made an output buffer, which eliminate the effect of output circuits on the work Schmitt trigger.

Fan is used with motor at 12V (as in the power supply of the computer). Includes his Darlington transistor VT1 (compound transistor).

Thermistor type MMT-4.

The establishment is to configure the input sensor "rezisto rum R1. You will need to use some exemplary thermometer to determine the temperature of the inclusion of a fan.

If you want you can set the sound selection of hysteresis resistance R3.

Author: Galanov, G. M.

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