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Old 30th May 2010, 11:11 PM   #11
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Exactly. Thanks guys!
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Old 31st May 2010, 12:00 AM   #12
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The use of 2 is abundantly clear. The mass of 300 VA of E-I transformer may not be.
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Old 1st June 2010, 11:23 PM   #13
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I don't plan on carrying that amp around much. It will be set up on my desk and stay there until for example I move house.
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Old 18th August 2011, 09:32 AM   #14
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In order not to open another thread I wanted to ask a question on obtaining a ceter tap. I reently came across a stock of pcb transformers:

Click the image to open in full size.

not very powerful but often handy for small DAC/electronic applications.

The xmfrs I have are 220v - 13 13 no center tap.

If I connect the inputs in parallel and the secondaries (careful to the phase) could I obtain a 13 -0 -13 transformer?

Thanks.
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Old 18th August 2011, 10:52 AM   #15
AndrewT is offline AndrewT  Scotland
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Hi,
You tell us it has a 220Vac primary.
To connect the inputs in parallel you need to start with a dual primary. What are you going to parallel?

The secondary is 13 13 no centre tap.
Do you mean 0-13Vac, 0-13Vac = dual secondary with 4 connecting pins?

I think I can read:
230V 5VA
0 15V 0 15V
printed on the top panel.
That is likely to to be a 230:15+15Vac transformer.
Measured open circuit will likely be 18+18Vac to 20+20Vac
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Old 18th August 2011, 11:05 AM   #16
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I am sorry....the picture was just for reference should have cleared that in the post

The secondary is 13vac + 13vac
the primary is 220v

Is there any way I can obtaina center tap by using multiple transformers like the one described?
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Old 18th August 2011, 11:14 AM   #17
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it... is very possible .... what you actually have to look at if the primary is 220 or 230 ... this actually is not a minor diference

if trafos are 220 rated runing them in 230 and often at nights 240 might be an issue and trafos will not make it in long run terms
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Old 18th August 2011, 11:15 AM   #18
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Actually 230v I just had in mind our own national grid lines...they tend to drop close to 220v.

the trafos are 230v input 13+13 secondary
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Old 18th August 2011, 11:28 AM   #19
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My guess is the transformer in the picture has a 2-pin input and 4-pin outputs. Connecting the two middle pins of the output gives +0- at a good 100mA or so.
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Old 18th August 2011, 01:47 PM   #20
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by sakis View Post
if trafos are 220 rated runing them in 230 and often at nights 240 might be an issue and trafos will not make it in long run terms
why ?


p.s. using two trafo's is what I plan to do in a project. It's mainly to use up junk trafo's that I have. But it gives me the means to wire the primary for Canada or UK in the future. It also allows me to distribute the weight better inside the chasis.
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