Fan Control Circuit | Electronic Project Circuits

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Processor Fan Control

Fans in PCs can be objectionably loud. In many cases, the amount of noise produced by the fan can be considerably reduced by lowering its speed. Although this will decrease the amount of cooling, this need not be a problem as long as you don’t go overboard with slowing down the fan. Particularly with older-model processors, which consume quite a bit less power than the latest models, this trick can be used without any problems. This circuit is anyhow intended to be used with relatively old PCs, since more recent models generally have a fan control circuit already integrated into the motherboard. These controllers ensure that the amount of cooling is increased if the processor becomes too warm and decreased if the processor temperature is relatively low.
The circuit described here consists of only a handful of components, which you will probably already have in a drawer some-where. Transistors T1 and T2 are driven into conduction by the base current ?owing to the fan via P1 and D1. There will always be a current ?owing through R1, and it will be approximately 120 times as large as the current through R2. R3 has been added to prevent the base current of T2 from becoming too large when P2 is set to its minimum resistance. D1 ensures that even at this extreme setting, the voltage on the base-emitter junction of T3 will still be large enough to allow it to conduct.
source: http://www.extremecircuits.net/2010/07/processor-fan-control.html

Be the first to comment - What do you think? Posted by admin - September 9, 2010 at 5:50 pm

Categories: Electronic Control Tags: fan control circuit, pc fan speed control

Fan Speed over Ride Switch

If you get into trouble about the heat of notebook. Today I begs for to advise the way enhances the speed of the electric fan with Fan Speed over Ride Switch circuit. Normally the electric fan will begin to turn when 60 c temperatures by have voltage feed 2.0 v. If still hot again enhance voltage go to 2.1,2.2,2.3….3.0V. At 80c circuit temperatures board circuit send the maximum score only. But temperature still go up again arrive at 100c until shutdown by oneself finally.

When try wire for electricity usb 5V as a result make the electric fan turns well. But have a voice loud all the time in usual usability do not have to command give small stump hill turns fast all the time only. Then have the circuit checks that at present have 3V pressures have already. As a result become voltage 5V replace, make the electric fan turns fast go up originally more.
The work of the circuit, easiness just use transistor and diode only. Usual when voltage do not arrive at 3V make Q1 PNP do not lead the trend. But when voltage many arrive at 3V, have current change D3-D6 1N4148 make Q2 – 2N2222 ead the trend and Q1 – 2N2905 bias follow make voltage 5V, Change small stump electric fan hill well. The D1,D2 1N5819 use for protect volt flow turn back. The detail is other see in the circuit.

Be the first to comment - What do you think? Posted by admin - May 18, 2010 at 11:12 pm

Categories: Electronic Control, Motor controller Tags: fan control circuit, fan speed notebook, laptop fan speed

Deoderizer Fan Timer

It is the circuit delays like model easy onely. It use control 3Volt electric small-sized fans because of apply to battery 3V or AA CELL 1.5V x 2. When press SW1 the system delays to begin the work. It make the electric fan turns the one period of time. The circuit uses transistor PNP and NPN work a pair enhance add the efficiency of C1 and R1 use in time supervision. This circuit use current about 30mA only.
A battery operated fan blows air accross a stinky pad
For use in a bathroom or car. I’ve seen similar circuits used in plastic pot-pourri containers.

Link : http://www.members.shaw.ca/novotill/DeoderizerFanTimer/index.htm

Be the first to comment - What do you think? Posted by admin - June 19, 2009 at 9:50 am

Categories: Electronic Control, Timer Tags: fan control circuit, fan timer, timer controller