Question about transformers?

harmonicconverger · 5th February 2012, 09:30 AM

i have 29-0-29 volts transformer. i'm from philippines. our voltage from outlet is 220v, but i have this large transformer with 100v labeled in the primary. can i use 110 to 220v converter?

one more question. i have this another transformer with black, green, yellow, white and red color leads. can you tell me what this color codes stand for?

harmonicconverger · 5th February 2012, 09:38 AM

here it is.

i think it is 110 to 220 volts converter. but the leads are confusing.

GloBug · 5th February 2012, 02:07 PM

Do you have a multi-meter? (DMM)

KatieandDad · 5th February 2012, 02:10 PM

How much power are you trying to employ from the final transformer ?

Looking at the photo I think you would be better off buying a new transformer.

Richard Ellis · 5th February 2012, 02:23 PM

Yes I would think you could stand to get a replacement for this transformer.
Look at where the wires are coming from....those holes in the four corners are suppose to have nuts & bolts squeezing the lamination stack together,
If you have a choice, get a true 220-110? step down transformer.....The bulk of the 'conversion transformers are what's called "Auto-Transformer"s.
Try to get a "true" transformer with both Primary and secondary windings, not the common windings of an Auto-Transformer.

__________________________________________________ ________Rick.......

KatieandDad · 5th February 2012, 02:25 PM

Are you trying to replace it or just use it ?

harmonicconverger · 6th February 2012, 12:28 AM

it has a cover. i thought that if i will remove the cover i will got the primary and secondary winding. but that is what I've got. step down transformers are expensive here. i just want to use it for my 100 volt amp.

FRANK BRAUN · 28th February 2012, 04:28 AM

You can use a 220v to 100v (and not the common 110 v out) auto transformer. If you are using it for audio (obviously since you're on DIY audio), consult the power rating of the audio product on the back label and note its power rating in watts. Your converting transformer should be larger than the rated consumption. Try getting a 100 v output converter if you can, doing math you will get approx 5-10% higher voltage on the secondary if you use the common 220 - to - 110 converter.
YOU CAN USE approx. 500- w converter to be safe.

PS. Don't use PC AVRs w/ 110v outlets they're for low wattage consumption only!

Tony · 14th March 2012, 02:12 AM

Quote:

Don't use PC AVRs w/ 110v outlets they're for low wattage consumption only!

agreed, they are completely useless....

5th February 2012, 09:30 AM	#1
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	Question about transformers? i have 29-0-29 volts transformer. i'm from philippines. our voltage from outlet is 220v, but i have this large transformer with 100v labeled in the primary. can i use 110 to 220v converter? one more question. i have this another transformer with black, green, yellow, white and red color leads. can you tell me what this color codes stand for?

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5th February 2012, 02:07 PM	#3
GloBug Banned Join Date: Jun 2011	Do you have a multi-meter? (DMM)

5th February 2012, 02:10 PM	#4
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	How much power are you trying to employ from the final transformer ? Looking at the photo I think you would be better off buying a new transformer.

5th February 2012, 02:23 PM	#5
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	Yes I would think you could stand to get a replacement for this transformer. Look at where the wires are coming from....those holes in the four corners are suppose to have nuts & bolts squeezing the lamination stack together, If you have a choice, get a true 220-110? step down transformer.....The bulk of the 'conversion transformers are what's called "Auto-Transformer"s. Try to get a "true" transformer with both Primary and secondary windings, not the common windings of an Auto-Transformer. __________________________________________________ ________Rick.......

5th February 2012, 02:25 PM	#6
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	Are you trying to replace it or just use it ?

6th February 2012, 12:28 AM	#7
harmonicconverger diyAudio Member Join Date: Nov 2011 Location: Philippines	it has a cover. i thought that if i will remove the cover i will got the primary and secondary winding. but that is what I've got. step down transformers are expensive here. i just want to use it for my 100 volt amp.

28th February 2012, 04:28 AM	#8
FRANK BRAUN diyAudio Member Join Date: Jan 2006 Location: makati	You can use a 220v to 100v (and not the common 110 v out) auto transformer. If you are using it for audio (obviously since you're on DIY audio), consult the power rating of the audio product on the back label and note its power rating in watts. Your converting transformer should be larger than the rated consumption. Try getting a 100 v output converter if you can, doing math you will get approx 5-10% higher voltage on the secondary if you use the common 220 - to - 110 converter. YOU CAN USE approx. 500- w converter to be safe. PS. Don't use PC AVRs w/ 110v outlets they're for low wattage consumption only!

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