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Re: [Amps] Filament Suppy, Info for G8WRB

To: "Dr. David Kirkby" <>,
Subject: Re: [Amps] Filament Suppy, Info for G8WRB
From: Radio WC6W <>
Date: Sun, 3 Jul 2011 12:17:00 -0700 (PDT)
List-post: <">>
Hi David,
  I've tweaked two commercial 5 volt SPS's up to 6 volts in this application.  
The only caveat is that the crowbar point needs to be run up in concert.

  I'd surmise that an old (1990's vintage) small (200 watt) computer power 
supply could be tweaked up to 6 volts by just adjusting one (fixed) resistor.

  If space was a concern the case could be removed and discarded.  At only 60 
watts (4CX1000A heater power) a supply of that ilk may run fine sans the fan.  

  As a bonus, +/- 12 (circa 14.5 once the supply is run up) volts will also be 
availble for relays or whatever.

73 & Good afternoon,
  Marv WC6W

> I see the link to eBay for 5 V SMPS, but any I've found can
> only be trimmed +/- 
> 10%, so giving a maximum output voltage of 5.5 V, so it
> seems that one will have 
> to be lucky to find a SMPS which works to 6 V.
> That's why I looked at a 7.5 V SMPS. I doubt that can be
> trimmed to 6.0 V, but 
> at least one can drop the 1.5 V with a resistor.
> Your not the first to suggest a 5 V SMPS, and I doubt you
> will be the last, but 
> getting 6.0 V seems outside the spec of any I have found.
> -- 
> A: Because it messes up the order in which people normally
> read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
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