The DC Brushless Fan is the best solution for now, but some predictions are that computers will soon be at 70dBA or the same noise level of freeway traffic. In the future we all may be liquid cooling but the heat has to go somewhere. Since the DC Brushless Fan is the mainstay of enclosures now, I researched how it actually operates as most HSF and Case fans are of this type.
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There are two types that are used in computers these days. They are the axial fan and the blower fan. The axial fan works best where the static pressure of the enclosure is not too great. The blower works better when the pressures are higher. The tradeoff is that the blower has a higher noise figure for the same air movement. The axial fan can be used in enclosures with higher static pressures if they are used in series, one blowing in and one blowing out. The static pressure of an enclosure is changed by the obstructions in the airflow. From my research it seems to be almost impossible to calculate, and expensive to empirically determine. In other words, experimentation is the key to good results. I will talk about the axial fan as it is adequate for most enclosures, and has lower noise. These days we are varying the speed of our fans to decrease noise while adequately cooling our enclosures. We can achieve the same airflow by using larger fans or more fans at a lower speed, while the noise stays below that of smaller fans at higher speed. Let us start by examining the DC Brushless Fan. Today there are two types of fans generally used. One is a sleeve bearing fan and the other is a ball bearing fan. The ball bearing fan is slightly more expensive than the sleeve bearing fan. The advantages of the ball bearing fan are that it has a longer lifetime when used in an ambient temperature above 20C. It can also be mounted both...
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.....
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