Quiet computer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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It is no secret that the system blocks of personal computers are quite noisy. Basically, the noise is "produced" by fans that cool the processor, power supply and video card. Sometimes the noise level is quite high, especially if the computer is based on an Intel Pentium 4 processor, since the cooling fan is usually quite powerful.
How to make work on your computer more comfortable? Many publications [1–4] are devoted to this issue. The problem is solved by reducing the fan speed in one way or another. Here we will talk about the same solution without fear for the "life" of the one whom the fans cool.
It is known that the Intel Pentium 4 processor is protected from overheating by the monitoring system and even if the cooling fan stops, it will not overheat, but will reduce the clock frequency and thus cool down. This innovation from Intel allows us to experiment with hardware with impunity without fear of burning it.
The temptation is great and justified. Firstly, more comfortable work at the computer, especially at night, when everyone is already asleep. Secondly, the uptime of the fans themselves increases dramatically. Thirdly, the vibrations transmitted to the processor from the cooling fan are significantly reduced.
Of course, I do not recommend experimenting with Pentium, Pentium 2 and other processors that do not have such a monitoring system. In addition, I do not advise you to experiment with video cards - after all, they are not yet protected from overheating either.
Everything is extremely simple [1]: a resistor is connected in series with the fan, and an oxide capacitor (taking into account the polarity), with a capacity of 10 μF for a voltage of 16 V, is connected in parallel with the resistor. The capacitor is needed to reliably start the fan at the moment of switching on. The resistance of the resistor depends on the current consumed by the fan and varies between 75 ohms for a current of 0,23 A and 110 ohms for a current of 0,16 A. The power of the resistor is 1 W. Essentially, the resistor cuts the supply voltage and fan speed by about half.
Mounting of additional elements can be carried out by a hinged method and, best of all, directly on the fan connector. To do this, by unlocking the latch, for example, with an awl, carefully remove the contact from the connector. Disconnect the conductor. We solder the connected terminals of the resistor and capacitor to the contact (do not forget about the polarity!). We insert the contact back into the connector, and solder the remaining leads of the resistor and capacitor to the disconnected conductor. Since the resistor will heat up, it is better to place the capacitor away from its body on the opposite terminal from the connector. The whole structure will be securely held on the connector perpendicular to the plane of the motherboard.
Literature
- Turchinsky D. Fan on the video adapter board. - Radio, 2002, No. 7, p. thirty.
- Revich Yu. How to make a computer "silent". - Radio, 2002, No. 8, p. 25, 26.
- Naumov M. PC fan control. - Radio, 2002, No. 9, p. twenty.
- Sirosh A. More about reducing the fan speed. - Radio, 2003, No. 3, p. 17.
Author: S. Tuzhilin, Shchelkovo, Moscow region
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