[ARC5] Building a power supply for an ARC setup

[Brian Clarke]

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 ;-)