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  #1  
Old 17th April 2022, 03:52 PM
Phil Y's Avatar
Phil Y Phil Y is offline
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Default Series secondaries?

Hello all,

I am messing around with a project and have found a problem with the transformer I'm using. The secondary is supposed to be 250-0-250 but one half is low and this can be seen as a lopsided waveform on the first reservoir cap. The high ripple is causing some hum. There is an unused 6-0-6 winding. Is there any reason I can't put this winding in series with the "low" half of the HT winding to even up the voltage?

Would that work or would it do something funny to the transformer?
Obviously the phase relationship would need to be correct for the voltages to add.
Advice gratefully received.

Phil.
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Last edited by Phil Y; 17th April 2022 at 05:40 PM.
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Old 17th April 2022, 11:07 PM
bikerhifinut bikerhifinut is offline
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Default Re: Series secondaries?

Give it a go and see what happens. You should be ok with it.
i'd question the quality of the transformer though if there was a significant discrepancy in windings that caused such an imbalance.

Andy
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Old 18th April 2022, 09:04 PM
John Caswell John Caswell is offline
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Default Re: Series secondaries?

That's perfectly acceptable, think about a tx with two 12V 1A secondaries. You can either series them for 24V at 1A or parallel them for 12V at 2A. As you say you need to keep the phases correct.

John
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Old 21st April 2022, 05:22 PM
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Phil Y Phil Y is offline
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Default Re: Series secondaries?

Thanks chaps, I'll give it a go.

Phil.
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Old 24th April 2022, 02:46 PM
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Phil Y Phil Y is offline
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Default Re: Series secondaries?

It seems to be working, many thanks.
Not quite even but much better, I may replace the transformer at some point but it is serving a purpose for now.

Phil.
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