[ARC5] Homebrew choke

[AKLDGUY .]

Sorry, I meant a power supply choke with iron core for B+ at 600 VDC. The
scheme is to use a standard old style 230-230 volt (NZ) isolating
transformer for the power transformer. I'm already using one with full-wave
bridge rectifier to derive 325 VDC for my BC-AO-230 transmitter.

Now I want to build a supply using the same transformer for my AN/ARC-5
transmitter. This will necessitate a voltage doubler circuit to get 650 VDC
(no-load). But because each capacitor in such a circuit is charged only on
alternate half-cycles, with the other supplying the full load, the
regulation, and hum, is going to be a lot poorer than it is in
the full-wave bridge circuit. So I need a choke.

Your experience with the primary of the filament transformer is
interesting. Did you measure, or notice, a significant improvement in the
regulation in a before/after comparison?

NZ house voltage is between 230 and 240 volts, so winding insulation should
be as good or better than the US counterpart.

73 de Neil ZL1ANM

On Wed, Aug 17, 2016 at 2:46 PM, J Mcvey <ac2eu at yahoo.com> wrote:

> for what? tx , rx , lv or hv?
> I needed a HV choke for the homebrew 12V dyno supply so I used the primary
> of a 12V filament transformer which had close to the correct inductance.
> Worked fine and held up to the 500V and 200 ma current. US house voltage
> is in excess of 340 vpp anyway, so I figured there was at least a 50%
> safety factor on the insulation...
>
>
> On Tuesday, August 16, 2016 10:04 PM, AKLDGUY . <neilb0627 at gmail.com>
> wrote:
>
>
> Anyone have experience or even just anecdotes about making a B+ choke?
> Interested to hear suggestions, no matter how weird the core you used.
>
> 73 de Neil ZL1ANM
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20160817/5c923b32/attachment-0001.html>