From scratch power supply ?

[whitney]

I have the pieces to put together an unregulated power supply but only know enough to be dangerous. What follows is what I plan, I'm hoping for a sanity check.
Start with a transformer that is rated at 27.3 VAC 2.3A output. I measured the output at 31 and some change, for the sake of argument I just rounded it to 30.

Rectified voltage through RBV-604 came out to 29VDC

A capacitor to smooth it out.
C= (80,000 * I)/V C=6,133 uf

Could this be used for an electronics power supply or am I way off here?

I only plan to use this for experimenting with a 5V 0.8 amp unipolar motor wired for bipolar operation.

Thanks in advance,
Whitney

[ViperTX]

Yes, you can use it to power the driver that will properly switch the windings.

[jerber]

Are you sure you measured 29 VDC after rectification ?
You should get aprox. 37 VDC (27.3 x 1.4 - 1.2).

Another thing is that a bipolar wired motor will draw 1.414 x the unipolar amps.
So if you are only using one motor you can use a smalller capacitor.

[NC Cams]

Good info source, even for experimentation:

http://www.campbelldesigns.com/files...ply-part-1.pdf

[keebler303]

I think the voltage was 29VDC before the cap. then you would still be seeing the average voltage which would be right around 30-drop across the diode.

Matt