I received another message from Dan to power this time to ask:
Subject: Frustrated with converter
So, the last month or two I tried to understand how different types operate from AC to DC power supplies, because I have a couple of audio / video receivers, trying to install fans inside the PC that this type of power required the '.
The problem is that I have drives that are less than 18 volts DC. I studied capacitors, variousTypes of diodes and means, which seem to connect, but I can not, in order to reduce tension. I have several ways to connect a resistance to it, and sometimes the resistance begins to smoke or not to change much try anything. im only really bothered spent many hours on this simple project. I would not ask you to explain to various electronic parts, because you're probably very busy so instead of giving me a brief answer to this?
I was more than 50 sites all over Google and can notYouTube, which I understand.
So it sounds like Dan has a situation where it is converted to alternating current to direct current, DC but he is too high for use with a 12V fan. The quickest solution is to find a fan AC (exist, but they can be strong and excessive for this type of situation). So instead we look to seek alternatives.
Let's say that Dan from the power supply is 12V and 18V fan needs a quiet PC.
Voltage regulator
Where you need a large amount of electricity,with a resistor / voltage divider is not always the best idea, because the current level causes heating / smoking - and that is usually a bad thing. An alternative is to use a voltage regulator - this is the same, forward excess power as heat, but in a controlled manner and let you be a cooling body. You need to find the current through the fan motor is necessary, then multiply by the voltage drop. So if you try to delete 18V to 12V and fanshould be 1 / 4 amp - it would be (18-12) * 4.1 = 1.5 Watts to be. (Watts and volts x amperes equal). The connection is simple - three legs: Input voltage, output voltage and GND.
Act as a regulator of Sun 1.5Watt warming, and if you do not have enough heat sink is attached, can overheat and go into thermal shutdown.
(As the controller has 5V laser harp to my original plan)
So if the power loss is not so high, it would be the cheapest solution would be to usethe regulatory authority.
Converters
A better method is to use more efficient power supply "switching" power. These take the input voltage (18V) and turn it on and very fast (several thousand times per second). The time that the voltage is compared with the amount of time that goes by so-called "duty cycle". So if I convert 18V to 12V, I wanted to do a cycle of 2 / 3. This is then fed through a network to smooth pull back to DC. I recently built some efficient DCConverter for a robotics project. It 'was important to the passage, because it does not discharge the battery to a power supply.
AC-DC
If Dan wants to touch only the power must be regulated, and increased first. The old school way to do this to a transformer winding that is close (but slightly above), the tension that you want to use. For example - 110V to 16V would be a good step down. AC 16V is then fed into a series of full-wave rectifierDiodes, the full-wave rectification are doing, and finally smoothed by 2-3 large capacitors, the voltage to something useful.
It should be noted that switching power supplies that can operate directly from AC. The AC is rectified and smoothed, but the full 110V and out to generate the power needed. The beauty of these units is that either 110V or 220V from the same, only the circuit controls the output and adjusts theDuty with the transition to the input voltage is passed Deal
Probably the best thing to do for Dan, check out the surplus electronics sites and take a 12V or 5V switching "power supply" and then install inside the case. They are small, efficient, and eventually sold for a dollar or two.
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