[minima] Re: Copper sheets
- From: farhanbox@xxxxxxxxx
- To: minima@xxxxxxxxxxxxx
- Date: Mon, 20 Jan 2014 09:00:03 +0000
Thanks for the info, sandeep. Vy useful!
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-----Original Message-----
From: Sandeep Lohia <sandeeplohia12@xxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Mon, 20 Jan 2014 14:22:41
To: <minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: Copper sheets
Thanks Arv & Farhan
Arv, AC 50 Hz PSU 18 Volt transformer (iron-laminate not toroidal)
has EM or ES? or both?
Mine inside RIG's cabinet/enclosure only (offcorce shielded with
grounded Brass sheet)
Guys bring a transformer PSU or UPS near color CRT monitor (if U still
have) give some loading & see the difference it makes on screen...
Also good practice is to dilute little rosin in medical white sprit
(or in acetone paint thinner), and give a fine conformal coating with
paint brush (after scratch/cleaning the clad), this saves bare copper
from getting *oxidize, changing it's color and making it hard for
soldering components after some aging.
This coating also acts as flux...
http://en.wikipedia.org/wiki/Rosin
Here available in medicine or raw paint shops (also used in varnish),
better known as Rohanam, galla, - Its actually a tree extract (resin
which oozes out of a tree bark when it is injured) and is without any
toxic acid. Its also the stuff which is used by violinist to keep
their bow's in shape. Or in smoke-sticks used for worship.
Most of the solder for electronics is "rosin core"--the wire-like
solder is actually a tube full of rosin flux.
I did diluted years ago in sprit (not very vicious), still using it
whenever necessary (immediately after etching) , but now a days it is
also available in the form of Golden color Liquid Flux (not
transparent white one) made by 'MAX' available with mobile repair
vendors...
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Please encourage recycling, reuse or repairing of E-waste.
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