When the fan seized up in my source and I changed it to a type with much less noise, turned on my computer, the largest source of noise CPU cooler fan. The computer I have a boxed Pentium III processor in slot 1, which is practically dismountable and fan replacement would be difficult. `Boxing` is a type of fan with ball bearings and replacement of the type of plain bearing to reduce noise, while cooling, but not reliability. Another option was to reduce the fan speed. I tried the program Speedfan. This enabled to set the fan speed, but I was unable to convince him to regulate the speed according to CPU temperature.
Click here to download the full size of the above Circuit.
Click here to download the full size of the above Image.
The PSU I have the controller in [1] , which I witnessed in earlier computers. I wanted to use it for the CPU fan, I used to but your friend "discovered" the regulator is used in battery charger for model. Involvement of the regulator in Figure 1 is ingeniously simple. The whole controller has only three components: sensors - NTC Thermistor, Trimmer for temperature control and MOSFET. The transistor is the best "standard" type with a threshold voltage around 4 V. For use in PC controller had to be adjusted. It should be that the fan is grounded, otherwise it does not capture special fan outlet "rotation". For proper function of the controller under quite simply figure A transistor to produce the opposite type of conductivity and change the polarity and the fan. The resulting involvement of the figure 2 is not accompanied by a protection circuit. The thermistor is connected to the controller a short cable. The frequent handling inside the PC could happen that turn leads somewhere. The regulator according to Figure 1 , the fan has stopped rotating, which could have fatal consequences especially for AMD. The regulator according to Figure 2 , in which case the current flow stops and the thermistor trimmer, transistor T2 is closed and the transistor T3 is connected in parallel to T1, opens. The fan is powered by the almost full supply voltage. The opening of T2 requires very little current, the transistor is open and current,...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: