I acquired another message from Dan, this time inquiring about ability supplies:
Matter: Pissed off with energy best psu for mining
So, the earlier month or 2 I’ve been endeavoring to determine out how different types of AC to DC ability provides do the job, considering the fact that i have a couple of audio/video receivers that im endeavoring to put in Computer system enthusiasts inside of that require that sort of electrical power.
The trouble is the fact I haven’t got any energy converters that happen to be less than 18 volt DC. I’ve been researching capacitors, different kinds of diodes and methods to hook them up but I cant appear to decrease the voltage. I have attempted a few alternative ways to hook a resistor as many as it and occasionally the resistor starts off smoking cigarettes or would not transform considerably of anything. im just really annoyed with paying out quite a few hours on this easy venture. I might loathe to request you to clarify many digital components considering the fact that you’re probably very fast paced so in its place could you give me a short reply to this?
I have been to more than fifty Google web sites and cant locate anything on YouTube which i comprehend.
So it looks like Dan provides a problem exactly where AC to DC has long been transformed, but he DC is simply too higher to work with having a 12V fan. The fastest alternative is always to uncover an AC supporter (they do exist, however they can be noisy, and overkill for this kind of situation). So instead let us look on the solutions.
Let’s express that Dan has 18V coming in the electricity source and he demands 12V to push a silent Computer system supporter.
Where you demand a large amount of recent, using a resistor/potential divider is just not usually the very best notion, as the present-day concentrations creating heating/smoking – and that is commonly a foul matter. An alternative should be to use a voltage regulator – this does precisely the same issue, dissipates the excess voltage as warmth, but will it in a a lot more controlled way and enables you to connect a heat sink to it. You would like to operate out the current necessary through the motor driving the supporter, then multiply this through the voltage drop. Therefore if you will be endeavoring to drop 18v to 12v plus your fan desires 1/4 amp – this is able to be (18-12) * 1/4 = one.five Watts. (Watts being energy and equivalent to volts x amps). The hookup is straightforward – three legs: input voltage, gnd and output voltage.
So your regulator goes to function similar to a 1.5Watt heater, and if you do not have sufficient heat sinking attached it’ll may well overheat and go into thermal shutdown.
(Such as the 5V regulator did on my authentic laser harp style and design)
Therefore if the ability dissipated is just not that high, the most affordable remedy will be to work with the regulator.
A better, far more efficient strategy is usually to use a “Switching” electric power supply. These acquire the input voltage (18V) and switch it on and off really swiftly (a huge number of times for each 2nd). The quantity of time the voltage is on, compared to the quantity of time it’s off known as the “duty cycle”. So if I needed to convert 18V to 12V I’d have to have a obligation cycle of 2/3. This is then fed by way of a community to easy it again out to DC. I recently created some productive DC converters for a robotics job. It absolutely was crucial that you make them switching because they would not drain the battery as much as a controlled electric power source.
AC to DC
If Dan desires to tap just the AC electricity then this has to be controlled and stepped down very first. The old school means of undertaking this is to use a transformer with windings that get you close up (but a little bit over) the voltage you wish. Eg – 110V to 16V will be a very good phase down. Then the 16V AC is fed right into a total wave rectifier array of diodes that do comprehensive wave rectification, and then eventually as a result of 2-3 massive capacitors to sleek the voltage right down to something usable.