[ARC5] Building a power supply for an ARC setup

Tue Apr 23 11:01:22 EDT 2013

I have never seen the suggestion of putting a zener diode across the choke before.
An interesting idea, but the average DC voltage drop across the choke is less than the 
actual voltage swing across it. Particularly if you have a choke input filter.

73
Bill wa4lav

________________________________________
From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on behalf of Brian Clarke [brianclarke01 at optusnet.com.au]
Sent: Tuesday, April 23, 2013 7:09 AM
To: David Stinson; arc5 at mailman.qth.net
Subject: Re: [ARC5] Building a power supply for an ARC setup

Good warning, Dave.

So, calculate the maximum Voltage drop across the choke and put a Zener
diode across it that has a breakdown Voltage a bit above that - just in
case - even put a small incandescent lamp in series with the Zener to
indicate when the choke has gone OC. A 39 V Zener carrying 400 mA will need
to be rated at 20 W. Much cheaper than buying a modern-day 10 H choke.

On another matter, the Eagle landed today. Well packed. Many thanks. Another
project can race to fruition!

73 de Brian, VK2GCE.

On Monday, April 22, 2013 11:52 PM, you said:

>
> ----- Original Message -----
>
>> I would suggest a 10 H choke if you can. And if you are worried about its
>> insulation after years of solitary shelf life, put it in the negative
>> lead.
>
> Respectfully:
> The following sounds obvious but with this old gear, it's not.
> Every year that goes by, I'm finding more Hi-Z grounds.
> Make sure you have a reliable Lo-Z ground connection
> between any external supply and the rig.
> If the old choke (or any B- lead) opens or goes Hi-Z
> and the bond between the supply and the rig is not a good one,
> the whole rig will be at B+ to supply ground.
> Please don't ask me how I know about this ;-)

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