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MariusDeJong
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Joined: 12/05/2012
Location: South Africa
Posts: 2

Posted: 02:46pm 16 May 2012

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On the site there is a schematic for a 10A variable power supply. I am currently building it and would like to some help with it. Can someone clarify the connection nodes. Where the line connect or just overlap. Attached is the schematic. I am still learning and would appreciate all the help i can get.

Marius de JongEdited by Gizmo 2012-05-18

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5078

Posted: 10:15pm 16 May 2012

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I'm guessing you mean the wire from pin 2 of the IC? Yes there should be a dot there, it joins to all the resistors.

I've updated the drawings

http://www.thebackshed.com/Windmill/articles/VariablePowerSu pply.asp

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

MariusDeJong
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Joined: 12/05/2012
Location: South Africa
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Posted: 06:32am 18 May 2012

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Dear Glenn

Thank you for your speedy reply and update. That is how I had it, looks like i will have to do some fault finding. The voltages seem to stay constant at 2.5V and doesn't want to adjust.

Marius de Jong

phase
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Joined: 16/09/2012
Location: Australia
Posts: 7

Posted: 12:50am 02 Oct 2012

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the lm723 cct is very simple and additional current transistors ae very simple to add..if you are still having trouble with the .."723 ..cct.." pl,s pm me ...

phase
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Posted: 05:45am 02 Oct 2012

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ok cool the lm"723 " can be used in numinous different equations ..Edited by phase 2012-10-03

larny
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Joined: 31/10/2011
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Posts: 346

Posted: 11:44am 02 Oct 2012

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This threasd had 2 pages before I logged in, but now I can only find one.

I had intended to quote one of phase's posts.

Phase, from memory, in essence you said "the LM 3914 can be configured to a single dot & the LED current can be set in the range 20-40 Ma"

You mean mA not Ma.

m = milli, M = Meg.

And the convention for units that are named after a person employ a capital letter.

In this case it was Ampere.

The same applies to Watt, Volt, Gauss, etc. but not units such as metre.

Hence mm = millimetre, km = kilometre, Mm = megametre.

Len

Downwind

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Joined: 09/09/2009
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Posted: 05:41am 03 Oct 2012

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[quote]This threasd had 2 pages before I logged in, but now I can only find one.

I had intended to quote one of phase's posts.

[/quote]

Perhaps its because you are in the wrong woods, and you should have commented in this thread.

http://www.thebackshed.com/forum/forum_posts.asp?TID=5207&PN =1&get=last#51893

Then all bears get lost in the woods at some time, just watch out for Goldie locks,
she will make a mess of your porridge.

Sometimes it just works

larny
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Joined: 31/10/2011
Location: Australia
Posts: 346

Posted: 12:06pm 03 Oct 2012

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Yes, you're right.

Thanks.

Fornunately, I've had my porridge already.

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