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From: John Rabson <john.rabson07@gmail.com>
Message-Id: <D008AD40-ECBE-4744-B546-A3EDA8BF601A@gmail.com>
Date: Sun, 1 Jun 2014 10:31:22 +0200
To: GQRP@yahoogroups.com,
 rsgb_lf_group@blacksheep.org,
 rsgb_lf_group@yahoogroups.co.uk
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 Content preview:  While chasing some QRM on LF, the ordinary wall wart which
    powered my receiver died. I replaced it with a switch mode power supply which
    I had previously used with a small computer. This turned out not to be a
   good idea for two reasons: [...] 
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Subject: LF: Switch mode power supply nasty
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--Apple-Mail=_5FACDFC3-0AB9-4110-A365-418912F9B7A7
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While chasing some QRM on LF, the ordinary wall wart which powered my =
receiver died. I replaced it with a switch mode power supply which I had =
previously used with a small computer. This turned out not to be a good =
idea for two reasons:

The new PSU generated even more interference, which seemed to have a =
fundamental frequency of 25 Hz (half that of the mains),
 More importantly, I got a tingling sensation when I touched the metal =
case of the receiver. Although my AC voltmeter did not indicate that the =
case was live, my trusty electrician=92s screwdriver with built-in neon =
bulb lit quite brightly.

This PSU is going to the electronics disposal unit at the local waste =
management site. Even if the stray potential is not a simple electrical =
hazard, it could easily provoke an involuntary movement resulting in =
damage to some piece of equipment. I seem to recall the late G3VA =
reporting in the Bulletin that he had lost an AVO 8 that way.

John F5VLF


--Apple-Mail=_5FACDFC3-0AB9-4110-A365-418912F9B7A7
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	charset=windows-1252

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">While =
chasing some QRM on LF, the ordinary wall wart which powered my receiver =
died. I replaced it with a switch mode power supply which I had =
previously used with a small computer. This turned out not to be a good =
idea for two reasons:<div><br></div><div><ul class=3D"MailOutline"><li>The=
 new PSU generated even more interference, which seemed to have a =
fundamental frequency of 25 Hz (half that of the =
mains),</li><li>&nbsp;More importantly, I got a tingling sensation when =
I touched the metal case of the receiver. Although my AC voltmeter did =
not indicate that the case was live, my trusty electrician=92s =
screwdriver with built-in neon bulb lit quite =
brightly.</li></ul><div><br></div></div><div>This PSU is going to the =
electronics disposal unit at the local waste management site. Even if =
the stray potential is not a simple electrical hazard, it could easily =
provoke an involuntary movement resulting in damage to some piece of =
equipment. I seem to recall the late G3VA reporting in the Bulletin that =
he had lost an AVO 8 that way.</div><div><br></div><div>John =
F5VLF</div><div><br></div></body></html>=

--Apple-Mail=_5FACDFC3-0AB9-4110-A365-418912F9B7A7--