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RE: Headphone Transformers

Now for something completely different :-)

get a 115+115:115+115 toroid transformer.

Series both the primary and secondary windings for 230:230

add the appropriate turns by hand to get the desired secondary voltage to translate to the desired load impedance.

Place one of the 230V windings in the plate and a Bypassed CCS in the cathode. Take a current mirror of the cathode CCS and feed the other 230V winding with the opposite current direction of the primary.

If that is too much work, just get a 230:9V toroid, put the appropriate number of parallel 10m45's in the plate and cap couple to it.

The lower the VA rating of the toroid the better... you give up a little in DCR but gain in inductance.

dave



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