Chip amp power supply- a beginners guide - Page 29

Nuuk · 27th February 2009, 02:44 PM

My question wasn't answered!

Can you use a light bulb tester with SMPS?

AndrewT · 27th February 2009, 03:06 PM

Hi,
ask the SMPS experts.
I bet they don't read Chip Amps threads.

and may explain why there's never been an answer.

Nuuk · 27th February 2009, 07:44 PM

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!

Redshift187 · 27th February 2009, 08:33 PM

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.

samsagaz · 6th March 2009, 02:42 PM

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?

AndrewT · 6th March 2009, 02:59 PM

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.

samsagaz · 6th March 2009, 03:13 PM

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

audio1st · 6th March 2009, 03:30 PM

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.

audio1st · 6th March 2009, 03:31 PM

And here is the dual secondaries transformer..

AndrewT · 6th March 2009, 03:33 PM

Nice diagrams Audio1.

27th February 2009, 02:44 PM	#281
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	My question wasn't answered! Can you use a light bulb tester with SMPS? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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27th February 2009, 03:06 PM	#282
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, ask the SMPS experts. I bet they don't read Chip Amps threads. and may explain why there's never been an answer.

27th February 2009, 08:33 PM	#284
Redshift187 diyAudio Member Join Date: Aug 2008	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.

6th March 2009, 02:42 PM	#285
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	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?

6th March 2009, 02:59 PM	#286
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.

6th March 2009, 03:13 PM	#287
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	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

6th March 2009, 03:33 PM	#290
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Nice diagrams Audio1.