Comments on: Studiomaster 16-4-8 latest on 13 October 2008 http://strangelyperfect.tv/1534/studiomaster-16-4-8-latest-on-13-october-2008/ This is Our World Wed, 16 May 2012 20:03:42 +0000 hourly 1 http://wordpress.org/?v= By: Strangely http://strangelyperfect.tv/1534/studiomaster-16-4-8-latest-on-13-october-2008/#comment-846 Strangely Mon, 13 Oct 2008 19:38:44 +0000 http://strangelyperfect.tv/?p=1534#comment-846 Sometimes it's to make cascading wiring easier. Sometimes it's to make sure that there is enough capacity for the return supply feeds. Or it's a combination of both! If there are several earth/0 Volt feeds, then care has to be taken to ensure earth loops aren't generated - hence my personally preferred use of a big blob of an earth made from the tag-strip I mentioned earlier i.e. it's pretty hard to generate an earth loop on something that's only two inches long! Rees Sometimes it’s to make cascading wiring easier. Sometimes it’s to make
sure that there is enough capacity for the return supply feeds.
Or it’s a combination of both!
If there are several earth/0 Volt feeds, then care has to be taken to
ensure earth loops aren’t generated – hence my personally preferred
use of a big blob of an earth made from the tag-strip I mentioned
earlier i.e. it’s pretty hard to generate an earth loop on something
that’s only two inches long!

Rees

]]> By: paul http://strangelyperfect.tv/1534/studiomaster-16-4-8-latest-on-13-october-2008/#comment-845 paul Mon, 13 Oct 2008 19:11:06 +0000 http://strangelyperfect.tv/?p=1534#comment-845 Cool thanks ive got to go over your other notes again as i dont understand the difference between the PSU ground which all the channels are connected to, plus the ground from the monitor channel to chassis, and the kettle plug groung to chassis thanks Cool thanks
ive got to go over your other notes again as i dont understand the difference between the PSU ground which all the channels are connected to, plus the ground from the monitor channel to chassis, and the kettle plug groung to chassis thanks

]]> By: Strangely http://strangelyperfect.tv/1534/studiomaster-16-4-8-latest-on-13-october-2008/#comment-844 Strangely Mon, 13 Oct 2008 18:37:05 +0000 http://strangelyperfect.tv/?p=1534#comment-844 Watson here. +15Vb relates to the second independent +15V supply. The other one should be called A but they were too lazy or they assumed that it's obvious to most people what it means - obviously not in your case, as it's all new to you. Like any business or work, there's a shorthand that people use.... The same chip is used to produce 48V & 15V! It's datasheet is here http://www.national.com/ds/LM/LM117.pdf You'll see that the O/P voltage is set via the resistor chain, which explains the use of a 1% tolerance resistor for the larger one. Anything worse and there will be too much error. I can't see everything at work, but the various O Volt connections are just that, I think. There is probably a bit of numbering or assumed numbering to the connectors. Maybe the connector goes A,B,C,D etc and then you'll know which pin has the OV. ? Ultimately though, they all connect together in the PSU. Colour coding of wires is good. That's one disappointment about the mixer loom....all the wires appear to be yellow! Ha Ha! At least they're in order, but if you ever need to separate..... Rees Watson here.

+15Vb relates to the second independent +15V supply.
The other one should be called A but they were too lazy or they assumed that it’s obvious to most people what it means – obviously not in your case, as it’s all new to you. Like any business or work, there’s a shorthand that people use….

The same chip is used to produce 48V & 15V! It’s datasheet is here
http://www.national.com/ds/LM/LM117.pdf
You’ll see that the O/P voltage is set via the resistor chain, which explains the use of a 1% tolerance resistor for the larger one.
Anything worse and there will be too much error.

I can’t see everything at work, but the various O Volt connections are just that, I think. There is probably a bit of numbering or assumed numbering to the connectors.
Maybe the connector goes A,B,C,D etc and then you’ll know which pin has the OV. ?

Ultimately though, they all connect together in the PSU.

Colour coding of wires is good. That’s one disappointment about the mixer loom….all the wires appear to be yellow! Ha Ha! At least they’re in order, but if you ever need to separate…..

Rees

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