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Voltage Regulators


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5V Regulators

Being stupid I can never find out how much resistor and what do i know I would need to get my 7,2V Racing pack battery to turn in to nice 5V that my other components like much better.

Then what makes me happy is when some electronics is simple, like the 5V voltage regulator; You insert "whatever" into it, and out you get steady, steady 5V!!

Note that the large metal-plate is for cooling as it can get hot, so you can put a screw into the hole and put it onto some metal with a larger surface.. BUT! This metal must not be a part of the circuit, I tried that once, strange things happend, smoke..IMG_3397.jpg

 

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Info on 3.3V regulators and suppliers can be found here.

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it should also be noted that the part where you can screw the regulator to something else is in fact also a ground.

Yes, very much indeed!!

I melted a bot once, because I did not know this!

A red wire (the power) that should be 5 volts.

And yes I have input, ground, and then output.

are you trying to power anything, or is the output just disconnected at the moment? If so, everything else seems fine so you probably just got a bad part, or overheated it a bit when soldering.
If you look at the front of the 7805, with the legs pointing down are your connections wired as input, ground, output, going from left to right? Also, what do you have connected to the output side of the circuit?

I have the POWER (red wire) connected to the input leg, two GROUND (black wires, one input, one output) connected to the middle (ground) leg, and another POWER (red wire) connected to the output leg. When I apply power (from a 9 volt) the regulator starts to smoke. Am I doing something wrong? Bad soldering?

Also, I have an on off switch in between the power source and the regulator on the red wire. Should it be on the black wire, or is this a factor at all.

Any help would be great.

 

 

 

Putting the power switch on the positive (POWER/red) wire is the more common way of doing it, but either way should work fine, no problems there.

Bad soldering is most likely to form an improper joint that doesn't conduct well, but that wouldn't cause the part to smoke. Check to make sure there's no solder or anything accidentally connecting any of the regulator's legs together. If that's not the cause of the problem, then the wires are probably connected to the wrong pins - what is the part number of the regulator you're using?

the 0 and the v are connected to the same pin and the other two wires are connected to seperate ones?

0V from your battery (ground) is connected to the ground pin of the regulator and then to ground in your circuit.

+V from your battery goes to the input pin and +5V comes from the output.

You should always check the data sheet to see which pin is which on the regulator as some regulators have different pin configurations.