Replacing an LL5402 with an OEP as Output Transformer

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RishiRishiRishi

Active member
Joined
Jan 29, 2024
Messages
30
Location
London
Hi,

I want to replace an LL5402 output transformer for the attached circuit to an OEP A262A2E (data sheets attached).

The LL5402 is a 2+2:1:1 transformer, and in my schematic it's wired with the primaries in parallel and the secondaries in series making a 1:1 transformer.

The A262A2E is a 1+1:2+2 transformer - in order for this to work as a replacement here, can I simply reverse the transformer and have the secondaries in parallel and the primaries in series, and use the primaries as the output?

Any help would be hugely appreciated!
 

Attachments

  • 5402.pdf
    371.6 KB
  • a262a2e-transformer.pdf
    100.7 KB
  • LL5402 Schematic.png
    LL5402 Schematic.png
    119.9 KB
  • Proposed OEP Wiring.png
    Proposed OEP Wiring.png
    125.4 KB
I can't see the circuit schematic. For 2:1 ratio, wire both sides of OEP A262A2E in series, then use primary at the output side as planned.
 
I can't see the circuit schematic. For 2:1 ratio, wire both sides of OEP A262A2E in series, then use primary at the output side as planned.

Thanks for the info!

But since the LL5402 has its primary in parallel and its secondary in series giving a 1:1 ratio, should I not wire the OEP primary in series, and have the secondary in parallel to give a similar 1:1 ratio? And then use the secondary as the output.
 
Yes, for 1:1 ratio wire OEP primary in series and secondary in parallel.
Not long ago i wired OEP A262A3E mic input's pri and sec in series because it works better this way for 150ohm microphones, inductance is higher. You could probably find post by a member Ruffrecords where he explained this better, it is not the same application but basics are.
 
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