Instructables
Picture of AC to DC converter=diode bridge
A diode bridge is a device that changes Alternating Current(AC) to Direct Current(DC). The difference between these two kinds are that, AC is pulsed electricity switching polarities 50-60 times per second.(If you look at electronic devices it says that it runs on 50 Hertz AC)Switching polarities= - to + and + to - 50 times in a second.DC is a continious current coming out.Example batteries.The polarities do not change in DC.The problem with AC is that you cant charge batteries with it.

In this instructable i will show you how to make a diode bridge.

(NOTE: This is not an instructable about how to charge batteries.If you are going to use the device, use it correctly.
For Example DO NOT PLUG IT IN THE POWER OUTLET AND TRY TO CHARGE YOUR BATTERIES SUPERFAST!THE BATTERY MIGHT EXPLODE AND CAN CAUSE INJURY OR DEATH. USE A CORRECT STEP STEP UP,DOWN TRANSFORMER IF YOU KNOW THE VOLTAGE RATING)
 
Remove these adsRemove these ads by Signing Up

Step 2: Twist the all the diodes' legs around each other

Picture of Twist the all the diodes' legs around each other
DSCF1895.JPG
DSCF1908.JPG
Get 3 diodes and twist them together striped sided on the bottom, except for the last one.The last one you reverse the striped side.

ARRGH!I cant explain with words!Look at the pictures below!After all, "A Picture is worth a thousand words", so said a person a long time ago.

Step 3: What to use it for?

DSCF1904.JPG
DSCF1902.JPG
i dunno...i use mines to charge my 10 volt batteries.you can use yours to do other stuff...use your brain!!!think of something!(Ex:use a step up transformer to charge Capacitors and make a welder?)whatever..im too tired.(yawn).good luck making it.some pictures below to show that it works.Goodnight.....(snore)...(snore)...(snore)...(fart)..
1-40 of 132Next »
him2anshu1 year ago
Mine is acting weird, I used a Step Down transformer, from 220 to 24V and 5A. But, it is providing 11-12 A and 40 V, what to do? I used a capacitor to smooth out the output. Please help, I need it to run motors for testing purposes

USE LM7824 Voltage regulator to control output at 24 Volt

jpiffr him2anshu6 months ago

a voltage regulator should be used, first charge a battery, then run your motor from the battery if you need precise control

jpiffr6 months ago

if you look up a ac to dc converter it will work better. you will need a transformer to decrease the ac voltage, then the rectifier, next a smoothing capacitor should be used (look up the correct size), a voltage regulator can be added for a specific voltage, a voltage regulator can be used in combination with resistors, capacitors, and a potentiameter to create an adjustable voltage, current is more difficult to adjust.

Actually its not such a good idea to connect this bridge rectifier directly to 220 volts AC,because the system will develop too much heat which is really undesirable and can cause damages.Usually such bridges are used after the mains voltage is stepped down to a lower voltage.But if you really want to convert 220 VAC to 220 VDC,be specific to buy diodes rated for use with higher volts.
with the rectifier is there is any way to sober the voltage to 12volts dc with 2 amp????
with the rectifier is there is any way to sober the voltage to 12volts dc with 2 amp????
with the rectifier is there is any way to sober the voltage to 12volts dc with 2 amp????
whan use diod bridge what the values of:-ac voltage,frequency
for charging 1.5 D.C battery
dsebiranda1 year ago
what kind of diodes should i select, can i mix small ones with big ones?
what is the best model to use in different setups?
OK, that's pretty awesome. But what's the DC voltage coming out of yours?
talha913 years ago
how can you come to know which is AC - ,+ corner and which is DC -,+ Corner??

whole thing is messed up buddy....
The connection where two marked sides of the diodes meet is the DC +ve and the connection where two unmarked sides of the diodes meet is the DC -ve.AC Doesn't have +ve or -ve and can be connected to the other two connections between the diodes in anyway.I am making this as simple as it could be.Hope it helps!
AC changes polarity 60 times per second. That's the whole reason for this diode bridge.

A diode only lets current flow in one direction. Therefore this diode bridge works by only letting the positive out of one side, and the negative out of another...

NOT messed up.
phoebemol2 years ago
Thanks so much for this instructable! I was having a really hard time trying to buy a ac-dc converter, I can't find one that could be used for my purpose ANYWHERE! Your instructions were straightforward and made a lot of sense. I am doing my science fair about charging my IPod on my bike energy, so it definitely will help my project with this info. Thanks again so much for posting this, you're amazing!
phoebemol2 years ago
Thanks so much for this instructable! I was having a really hard time trying to buy a ac-dc converter, I can't find one that could be used for my purpose ANYWHERE! Your instructions were straightforward and made a lot of sense. I am doing my science fair about charging my IPod on my bike energy, so it definitely will help my project with this info. Thanks again so much for posting this, you're amazing!
Thanks! It works fine, but the current is so small :(
Is there a way to increase it?
I need about 10 amps.
change each diode with more diodes, all pointing in the same direction.
(placing them in parallel).
two diodes in parallel will double the maximum voltage,
10 diodes in parallel will make the maximum voltage 10x larger.
(and also the current)
zapskate3 years ago
how long did it take to charge a 10 volt battery?
what was the output voltage?
what transformer were you using?
how many amps does that put out?
would it charge a 12 SLA or regular car battery?
if so how long would it take?

thank you?!
woks with 220 v ???
ya
devilmaycry3 years ago
Can i use 1N5818 Schottky Rectifier Diode to make the rectifier
KJ4ZVQ3 years ago
SOMEONE PLEASE REPLY!!!! im useing this to power radio nequipment so i need it as smooth as posible. could i connect a cap beteen the 2 dc outs or from just 1 out to the equipment leads?
Mudbud KJ4ZVQ3 years ago
put it in parrelel with the dc out so like the - with the - DC and the + with the + DC. Make sure its rated a little bit above the rated voltage and a higher uF will smooth it out more but takes a bit to 'fill' up.
GOOD JOB!!! Thanks.
ReCreate5 years ago
could i use LEDs instead since they are light emitting DIODES?
LED's are pretty sensitive to over-loading so they would burn up pretty quick, especially at high voltage like that.
joinaqd (author)  ReCreate5 years ago
umm no you cannot, unless the AC voltage is UNDER THREE VOLTS. I probably didnt mention on instructable but the diodes i used was 1N4007 which can handle up to 1000 Volts and 1 Amps.
What about those new 200v leds?
joinaqd (author)  ReCreate5 years ago
there are 200 volt leds??!?!? wow i need to get some of those! sure why not?if the leds are 200 volt then sure, it will work.
Oh yeah...they cost 200 dollars too!
You can only buy at least 50 or none Yeah really
No there are no 200 volt leds out there
joinaqd (author)  ReCreate5 years ago
LOL I JUST SAW THAT TINY FINEPRINT YOU WROTE UNDER THE COMMENT TODAY! IT SAYS "there are no 200 volt leds out there"
Wow really?
It took you that' long? XD'
joinaqd (author)  ReCreate5 years ago
lol yea..i zoomed in to 175% cuz i was like "WTF does that say?"
trix6664 years ago
does anyone know what type size these diode are i need something simaliar. Thanks
jules15 trix6663 years ago
This is a 40 amp 600 volt diode            <http://www.hurricanewindpower.com/servlet/the-146/Wind-Turbine-40-AMP/Detail>

I guess that's a mega diode. 

You can use two diodes in parallel(anode to anode, and cathode to cathode) as one big diode I'm pretty sure.  And finally, syncing circuits from two different breakers is a bad idea. Definitely against the NEC lol.  If you have any more questions, shoot..


jj.inc4 years ago
is that like 120v dc or did you bring it down somewhere like the transformer, and will the diodes handle 120v AC right out of an outlet.
jules15 jj.inc4 years ago
you would have to get the heavy duty ones at radioshack They're 6 amps 50 volts
jj.inc jules153 years ago
Do they make MEGA Diodes or can you double up if you are doing something that will draw more power than usually possible and can you sync up to outlets off to separate 20 amp breakers to get a 40 amp capability.
jules15 jj.inc3 years ago
This is a 40 amp 600 volt diode            <http://www.hurricanewindpower.com/servlet/the-146/Wind-Turbine-40-AMP/Detail>
I guess that's a mega diode. 
You can use two diodes in parallel(anode to anode, and cathode to cathode) as one big diode I'm pretty sure.  And finally, syncing circuits from two different breakers is a bad idea. Definitely against the NEC lol.  If you have any more questions, shoot..



1-40 of 132Next »