[Boatanchors] Choke Info Needed

[Gary Schafer]

You have that backwards. As current increases inductance DECREASES. A
swinging choke will have say 20 henries with low current and around 5
henries with high current.

Also, as ripple decreases (because of inductance increase), the voltage out
decreases.

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Price Smith
> Sent: Thursday, October 08, 2009 6:36 PM
> To: jfor at quik.com; Mark K3MSB
> Cc: List Boatanchors; Kenneth D. Grimm,K4XL
> Subject: Re: [Boatanchors] Choke Info Needed
> 
> A swinging choke is normally used between the diode and the first filter
> cap
> and the smoothing choke.
> As the current increases, the inductance increases. The inductance only
> affects the ripple. As the ripple
> decreases, the  effective voltage increases. Therefore with a resistive
> load, the current will increase.
> 73.Price W0RI
> 
> 
> 
> > Did you measure L as a function of current through the choke? It does
> not
> > sound like it.
> >
> > -John
> >
> > ===============
> >
> >
> >> Well,  I checked again and came up the same info.
> >>
> >> I was looking for a 4-12 H 300 mA swinging choke, and a friend of a
> > friend said he had one, and I picked it up last night.
> >>
> >> It's about 18 ohms DC resistance,  and the inductance measures around
> 2H
> >> (using the bridge on my IT-28,  which isn't too bad surprisingly).
> >>
> >> Since inductance is inversely proportional to current in a swinging
> > choke, I don't think what I have is a swinging choke.
> >>
> >> Mark K3MSB
> >
> >
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