[ARC5] Building a power supply for an ARC setup

[Fuqua, Bill L]

One is the audio output transformer.
The other is the choke of a Power Supply filter capacitor.
Bill 
________________________________________
From: J. Forster [jfor at quikus.com]
Sent: Tuesday, April 23, 2013 11:04 AM
To: Fuqua, Bill L
Cc: Brian Clarke; David Stinson; arc5 at mailman.qth.net
Subject: Re: [ARC5] Building a power supply for an ARC setup

Isn't there a NE-2 across the output transformer primary on some (all)
ARC-5 receivers to limit the P-P voltage excursions?

If so, same deal.

-John

===================



> 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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