[minima] Re: Copper sheets
- From: Mvs Sarma <mvssarma@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Mon, 20 Jan 2014 14:28:06 +0530
Perhaps a 0-15V transformer can keep the 12 V regulator cool. Unless one
expects input voltage drop there may not be need for 0-18 and wasting
power across regulator.
On Mon, Jan 20, 2014 at 2:22 PM, Sandeep Lohia <sandeeplohia12@xxxxxxxxx>wrote:
> 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...
>
>
>
> --
> --
> Please encourage recycling, reuse or repairing of E-waste.
> ░7░3░ ░d░e░ ░V░U░3░S░X░T░
>
>
--
Regards
Sarma
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