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Hello guys. I'm basically new to electronics and our classes has just began. Our prof is asking us to create a reversible(no polarity) dc power supply. eg. if i put +12v or -12v the output will be +5v. Can anyone help me on where or how to start with this. thanks in advance.
Non-polar dc power supply
- Thread starter icyhot01
- Start date
There is an introduction to how a bridge rectifier works on this page:
http://www.allaboutcircuits.com/vol_3/chpt_3/4.html
I suggest stopping when you get to the 3-phase rectifier, or you may become confused; it's a bit much to absorb in the beginning.
You can go to the various chapter headings if you wish to learn more about diodes and rectifiers.
For regulation of the output at 5v, you might consider using an LM7805 regulator, or an LM317 adjustable regulator. Both of those will require capacitors on the inputs and outputs. The LM317 will additionally require two resistors to set the output voltage. Find the datasheets for these regulators and study them.
For the LM317, I'll suggest using 120 Ohms for R1 and 360 Ohms for R2. The basic schematics are in the datasheets under Typical Applications.
http://www.allaboutcircuits.com/vol_3/chpt_3/4.html
I suggest stopping when you get to the 3-phase rectifier, or you may become confused; it's a bit much to absorb in the beginning.
You can go to the various chapter headings if you wish to learn more about diodes and rectifiers.
For regulation of the output at 5v, you might consider using an LM7805 regulator, or an LM317 adjustable regulator. Both of those will require capacitors on the inputs and outputs. The LM317 will additionally require two resistors to set the output voltage. Find the datasheets for these regulators and study them.
For the LM317, I'll suggest using 120 Ohms for R1 and 360 Ohms for R2. The basic schematics are in the datasheets under Typical Applications.
