Re: gEDA-user: OT: help needed; asymmetric load after rectifier seems to disrupt its working.

[gene glick <carzrgr8@xxxxxxxxxxxxx>]

On 06/16/2011 02:30 PM, myken wrote:
> Hello all,
>
> I would appreciate some expert advice.

Are you trying to make a low current power supply?

I agree with DJ - the unequal loading on + and - cycle will average to 
something other than zero (unequal capacitors, unequal diodes, etc) If 
Vx must always be average zero - you'll need to do something else.

If you can handle a little voltage drop, don't care what happens to Vx, 
and don't mind adding a few parts, make a cheapo regulator with a zener 
and BJT? (Or maybe use TL31 instead of zener)

What about a small transformer, one winding on primary, center tapped on 
secondary.  Add a diode and a cap for each leg - and there you go!

Anyway, there's lots of ways to do this.  If regulated output is what 
you want, a little more work is required.


gene


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