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Old 17th August 2012, 09:41 PM   #5241
50AE is offline 50AE  Bulgaria
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Hi, I have a question about the current. I have built a v1.1 5V shunt ment for low current (10mA) but I decided to give it to a person who wants to use it for currents like 500mA and a little more (say 600-700). For how much current can the v1.1 work?
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Old 17th August 2012, 10:30 PM   #5242
Salas is offline Salas  Greece
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For as much as the safe operation area of the Mosfets used, the sinking, and the ambient temperature allow. Its about dissipated power so voltage is as much important as current.
An example of a 5V reg biased at 1A would need 1.5C/W common sink for both Mosfets.
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Old 18th August 2012, 05:14 PM   #5243
orelli is offline orelli  Italy
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Hi Salas, I want purchase some R-core txs from Selectronic, but by the photos they are all
center tapped (they have 3 output wires).Can I divide phisically the secondary to get two
indipendent ones? ... desoldering the two wires that form the central tap?
Ciao, Orazio
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Old 18th August 2012, 07:31 PM   #5244
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Selectronic R-Core aren't center taped, input are phase, neutral & 3rd wire gnd is electrostatic shield, outputs are almost all transformers dual secondary with 4 wires.

Ciao
Felipe
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Old 18th August 2012, 08:22 PM   #5245
orelli is offline orelli  Italy
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Muchas gracias Felipe, I'm confused by the photo of 50VA, there are 3 big wires(white,yellow and black),I thinked they are the secondary ones, and 4 little ones
that I thinked the primary ones.
Ciao, Orazio
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Old 19th August 2012, 08:52 AM   #5246
AndrewT is offline AndrewT  Scotland
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to be absolutely sure ask the retailer what the wires colours are and how to connect up.

As a back up safety measure, use a bulb tester for mains power up. Then you can check voltages without damaging the transformer.

BUT !!!!!! if you wire it back to front, then the secondary voltages will be enormous, maybe way over 1kVac. So sort out the wires colours first.
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Old 19th August 2012, 10:42 AM   #5247
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Quote:
Originally Posted by orelli View Post
Muchas gracias Felipe, I'm confused by the photo of 50VA, there are 3 big wires(white,yellow and black),I thinked they are the secondary ones, and 4 little ones
that I thinked the primary ones.
Ciao, Orazio
Prego, yes 3 big wires are the primaries for AC & the 4 small wires are secondaries
Buon lavoro, Felipe
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Old 19th August 2012, 10:43 AM   #5248
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Quote:
Originally Posted by AndrewT View Post
to be absolutely sure ask the retailer what the wires colours are and how to connect up.

As a back up safety measure, use a bulb tester for mains power up. Then you can check voltages without damaging the transformer.

BUT !!!!!! if you wire it back to front, then the secondary voltages will be enormous, maybe way over 1kVac. So sort out the wires colours first.
Selectronic R-Cores transformers have writed the color codes in each transformer so don't need to do nothing.
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Old 19th August 2012, 10:46 AM   #5249
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by orelli View Post
.......... I want purchase some R-core txs from Selectronic, but by the photos they are all
center tapped (they have 3 output wires).Can I divide phisically the secondary to get two
indipendent ones? ... desoldering the two wires that form the central tap?.................
Quote:
Originally Posted by orelli View Post
............... I'm confused by the photo of 50VA, there are 3 big wires(white,yellow and black),I thinked they are the secondary ones, and 4 little ones
that I thinked the primary ones.
...........
Quote:
Originally Posted by merlin el mago View Post
Selectronic R-Cores transformers have writed the color codes in each transformer so don't need to do nothing.
then why does he need to ask the questions?
Is he a danger to him/herself?
Should we be helping this person to kill themselves?
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Old 19th August 2012, 10:54 AM   #5250
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Thick 3 wires primary, thin 4 wires secondary.
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