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1N4007 is good for 1 amp 1000 volts.
It will work but it will give you a ripple voltage a little more than 12 volts.
You will need a couple capacitors and a voltage regulator to get a perfect 12 volts DC.
A 25 volt 2200 uF capacitor to a standard 7812 regulator setup.
Something like this circuit.
what can i use ground as
Ground is usually the negative side of your bridge rectifyer.
A Voltage Regulator is a basically must. Unless you are running something like Automotive electronics, that are designed to tolerate Voltage spikes and dips, you may shorten the life of the Equipment or cause it to malfunction.
A ready-to-go bridge rectifier will be a bit quicker/ Easier to assemble; diodes will work just fine. You could do without those 1N4004's.
But, hey, we all like Overkill right? :P
Don't forget a Fuse !
unfortunately you will still need a regulator it only take a few min to install on though well worth the time !
No, a bridge on its own gives you the ripple. You HAVE to have at least a capacitor - and a 12V transformer will put 18V on your capacitor, and the output of your circuit.
Without a capacitor to keep the ripple high you will have a bouncing voltage 0 to about 18 volts. And yes 18 volts is correct. 12 volts AC is an average. The true peak to peak AC voltage is more 36 volts when you rectify it you get around 18 volts DC ripple. The right capacitor will raise the ripple to between 15 and 18 volts, and the voltage regulator will remove all voltage above 12 volts as long as the ripple is 1 to 2 volts above the regulated voltage. So no you can't just use a rectifier to get a perfect 12 volts DC.
A bridge is actually four diodes inside an epoxy package and sometimes a heat sink is added so you do not have to spend time wiring it yourself.
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