Re: Ripple filter

On Sat, 14 Jan 2006 02:57:42 GMT, "John Doe" <xxx@xxxxxxx> wrote:

>
>"John Fields" <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote in message
>news:3kqfs1pvm205424lkc8osb1a1o9bbr8baf@xxxxxxxxxx
>##snip ##
>> After all is said and done, I'd put a 2000µF/25V aluminum
>> electrolytic in there and be done with it.
>>
>> --
>> John Fields
>> Professional Circuit Designer
>
>
>THANKS for all replies!
>John I agree that that would be the easiest thing to try so will look for a
>large electrolytic capacitor and let you all know how it works. Thanks for
>doing the math- I was way off with my .1mfd. If that don't work will look
>look into the regulators mentioned.

---
If you were blowing up fans before, and you connect up that 2000µF
cap without using a regulator, you'll blow them up even quicker.

You _must_ use a regulator or a series resistor if you expect your
fan(s) to survive.
---

>Do they still make germanium
>transistors (low voltage drop)? I looked for them once -not too hard- and
>all I could find was antiques.

---
You don't need a germanium transistor in there, you need a
regulator.
---

>I wasn't too clear on the ripple source. The charger for the RV -called a
>converter- has 2 outputs, one for battery, the other powers the fuse bus for
>the RV accessories. I think they do this so charge rate won't be affected
>by accessory load. So I guess the battery might filter it's output but the
>fuse bus is not- wish I had a scope.

---
Do you have a multimeter?

If you do, why don't you measure the DC voltage and the AC voltage
on the fuse bus and post back with what you find?

If you don't, why not buy a cheap one? They're handy...

--
John Fields
Professional Circuit Designer
.

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