Re: RCA to PCB connections
From: legg (legg_at_nospam.magma.ca)
Date: 07/27/04
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Date: Tue, 27 Jul 2004 23:26:18 GMT
On 27 Jul 2004 03:02:00 -0700, bg_ie@yahoo.com (Barry) wrote:
>Thanks for your suggestion.
>
>So basically I would have the bnc female connectors on each board
>facing each other, with about 1cm between each. This will connect the
>signal lines, but what about the ground lines? I could solder them
>perhaps with a short lenth of copper wire, but I don't want to
>interfere with the codec board.
>
>How would your u-bend suggestion compare with the use of such a
>connector -
>
>http://www.ba-electronics.com/caa40b.jpg
>
>with regard to signal to noise ratio? I guess it would depend on the
>material - gold, tin etc. So, would I get the same performance with a
>tinned u-bend and a tinned connector as in the diagram? I'd like to go
>with your suggestion because this would give me only 1cm or so of
>seperation between the two boards. This will allow me to design a
>larger board.
>
>The bnc connectors on my board appear to be tin plated and the
>converters have a SNR of around 90dBs -
>
>http://www.icet.pucpr.br/afonso/Graduacao/Outros/Audio/tlv320aic23-manual.pdf
>http://www.tij.co.jp/jsc/docs/msp/da/products/pdf/tlv320aic23.pdf
>
A shorting u-bend is obviously more useful in connecting signals that
are otherwise intended to be externally processed.
Depending on your hardware configuration - the more permanent the
connection is intended to be, the less suited connector hardware will
be in general. A permanent installation will benefit from hard-wiring
- connectors are notorious for becoming noise sources as the years go
by. Shielded cable would be best for hardwiring, though the shield
connection need not be made at both ends.
The loop was generally only used to reroute in-line high-level
signals, and the connector return was common to the chassis, when not
carried out to and returned from the remote processor with shielded
cable hardware.
If your two assemblies are mounted on the same grounding hardware
plate, the common return is easily made there.
RL
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