Do-it-yourself thermal control for a computer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Do-it-yourself thermal control for a computer. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Computers

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Sitting at the computer at night, I noticed the excessive noise emitted by the air cooling system. And why not automatically, depending on the temperature, control the speed of the coolers? After 2 months of looking for a suitable circuit, I improved and tuned it. The circuit performs relay speed control of 3 coolers at once, depending on the temperature.

Do-it-yourself thermal control for a computer. Thermal control circuit for PC

Schematic diagram

For myself, I decided to use a hard disk as a measured object, the response temperature set for me was about 39-40 degrees. The NTC thermistor B57891-M 103-J 10 kΩ served as a temperature sensor, the thermistor is fixed on the metal cover of the hard drive. The circuit consists of a control block and an indication block. The control unit consists of a Schmidt trigger on the K553UD2 operational amplifier. 3 coolers are connected to the circuit, 2 of them work for the inlet-outlet of the air flow from the PC case, the third cooler is installed at the bottom of the hard drive. The display unit is made using the K561TL1 microchip.

Now a little about the operation of the circuit

The op-amp compares the two voltages at its inputs, and if they are equal, then the op-amp supply voltage appears at the output. The response temperature is set by a variable resistor R2, for a more accurate and smooth setting, R2 and R9 were soldered in series to R7, the values \u1b\u8bof which are selected empirically. Zener diode VD8 is necessary to stabilize the supply voltage of the op-amp. Resistor R1 provides positive feedback. The value of R1 was determined empirically. Capacitor C3 completely eliminates unwanted and unexpected mode switching. Transistor VT2 takes over the load current from 5 coolers. The Zener diode VD6 allows you to set the supply voltage of the coolers before the relay trips in the range of XNUMX-XNUMX V.

The display block shows what mode the circuit is in at the moment. If the temperature is below the value set by the variable resistor R2, then the blue LED is on. If the relay is activated, the red LED lights up.

In conclusion, I give photos of the device I got. As well as file for SprintLayout v.4

Do-it-yourself thermal control for a computer. End device type

Do-it-yourself thermal control for a computer

Author: BATCOH, iupfan {dog} mail {period} ru; Publication: cxem.net

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