SE OPT as PS choke

dovla · 10th June 2011, 09:35 AM

I have some 12K:4R SE OPTs, likely from old radios with EL95. Can this be used as PS choke?
If yes, what to do with the secondary (leave open?)
DC resistance of the primary is rather high at 360R but it would probably end-up in a low-wattage monoblock with 30-40ma current draw so voltage drop would't be that horrible.
Paralleling the primaries of two transformers would reduce DC resistance but would inductance also be lowered?

Tom Bavis · 10th June 2011, 01:48 PM

Will work fine - a single-ended transformer is a choke with a secondary winding...

Secondary can be left open or connected in series for a tiny increase in inductance. Two in parallel would halve inductance (assuming they're the same).

10th June 2011, 09:35 AM	#1
dovla diyAudio Member Join Date: Mar 2010	SE OPT as PS choke I have some 12K:4R SE OPTs, likely from old radios with EL95. Can this be used as PS choke? If yes, what to do with the secondary (leave open?) DC resistance of the primary is rather high at 360R but it would probably end-up in a low-wattage monoblock with 30-40ma current draw so voltage drop would't be that horrible. Paralleling the primaries of two transformers would reduce DC resistance but would inductance also be lowered?

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10th June 2011, 01:48 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Will work fine - a single-ended transformer is a choke with a secondary winding... Secondary can be left open or connected in series for a tiny increase in inductance. Two in parallel would halve inductance (assuming they're the same).

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