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Old 27th February 2009, 02:44 PM   #281
Nuuk is offline Nuuk  United Kingdom
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My question wasn't answered!

Can you use a light bulb tester with SMPS?
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Old 27th February 2009, 03:06 PM   #282
AndrewT is offline AndrewT  Scotland
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Hi,
ask the SMPS experts.
I bet they don't read Chip Amps threads.
and may explain why there's never been an answer.
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Old 27th February 2009, 07:44 PM   #283
Nuuk is offline Nuuk  United Kingdom
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Quote:
Originally posted by AndrewT
Hi,
ask the SMPS experts.
I bet they don't read Chip Amps threads.
and may explain why there's never been an answer.
They don't read the chip amp threads?

Well, I went ahead without the light bulb tester as it was a supply that I had used previously anyway. We will have to find a tame SMPS expert for future reference!
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Old 27th February 2009, 08:33 PM   #284
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Thanks Andrew, that answered my question nicely. I don't have a bypass switch on mine. I put a momentary push-to-make switch (15A) in series with the bulb so that if there was a problem I would only have to let go to shut off the power. Also, with the system I have, a 40 watt bulb barely lit when charging the capacitors, so it was a good choice.
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Old 6th March 2009, 02:42 PM   #285
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let me ask an simple question.. an Toroidal transformer for example

220/ 20-20 200VA, mean that each secundary are 200VA or each one are 100VA?
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Old 6th March 2009, 02:59 PM   #286
AndrewT is offline AndrewT  Scotland
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200VA is the total output VA.

But each secondary winding can be rated so that the total exceeds the VA rating if all the windings supply maximum current simultaneously.
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Old 6th March 2009, 03:13 PM   #287
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nice to heard that!

i found in my country some toroidal transformer!!! for each channel for example i will use
220 V. / 23 v./ 23 v. 160 VA (they told me that each secundary have 80VA) so will be OK

220 / 23-23 160VA cost me 50USD.
220 / 23-23 200VA cost me 58USD.

and with CT intead 2 secundary it cost me

220 / 23-0-23 160VA cost me 48USD.
220 / 23-0-23 200VA cost me 56USD.

for 2USD i will choice with 2 secundary instead CT


Thanks for all
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Old 6th March 2009, 03:30 PM   #288
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Here are some diagrams that I hope show anyone new to dual voltage supplies, how to get the V+, V- and Gnd from their transformers.

First the centre tapped transformer.
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Old 6th March 2009, 03:31 PM   #289
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And here is the dual secondaries transformer..
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Old 6th March 2009, 03:33 PM   #290
AndrewT is offline AndrewT  Scotland
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Nice diagrams Audio1.
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