OT: Bush Thugs Rough Up Grieving Mother of KIA

[Rene Tschaggelar]

Yannick wrote:

what do you mean by mass? earth or gnd? i dont actualy have a gnd apart from
that provided by the scope earth clip, as the power suply is double
isolated, but the sheild is at what i consider 0v, i might however have gnd
at 3.5 v so the laser diode body is grounded, or have a seperate -3.5v suply
for the laser and a level shifter.


Yes 0V, why should u use the voltage of the laser body for shielding?
i was thinking this voltage of the shield has to be as low as possible
(relative to the used voltages) soo most EMI will not get past.
are doing the same , can you explain this?

It makes sense to use the potential of the laser body as shielding
potential. Otherwise an electric conntection between the two, eg
they being mounted onto the same sheet of Alu or such, would let a
current flow.
The potential of a surface is relative to others and has no influence
on how the EMI is spread.
Isolating the laser body creates some optics precision problems plus
perhaps heat problems.
If the laser body is the positive laser terminal, the current source
is negative. Is there a problem ?

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
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[martin griffith]

On 29 Sep 2004 02:30:20 -0700, in sci.electronics.design you wrote:

Hello,

The SAA3049(A) intended for decoding RC5 code (infrared remote
control) is no longer manufactured by Philips Semiconductor.

Is there a replacement for it ? Should be, as RC5 is still very
common.

More info on RC5 available on
http://members.chello.nl/a.neyenhuys/inhoud/rc5%20uitleg.htm

Thanks for help

Geert

Its a very old design, with microchips being o powerfull these days
its probably quite easy to just add it too your system

http://www.donberg.ie/descript/s/saa3049.htm
has them at 29€, ouch
and
http://www.factorydirect.co.uk/factorydirectproducts/irproducts/irdecoder.html
has something similar at Ł3.55, but a MOQ of 25
but
http://www.8052.com/codelib/rc5.c

seems to be the way to go



martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.