Mystery transformer
"GRe"
"Phil Allison"
You need a THD meter to make sense of what matters and what does not.
Input f/V/THD Output THD (600ohm terminated)
1kHz/1.0V/0.075% 0.082%
1kHz/3.6V/0.086% 0.101%
3.6V is the max. output for the audio generator.
** You need to use a much lower frequency.
Transformer non linearity is concentrated at the low end of the audio
band.
Can one simply substract THD Out/In numbers to gain THD for the
transformer only?
** To a rough approximation only.
The figures quoted above suggest the tranny is adding almost nothing.
PLUS it is crucial the source impedance be low - like 50 or 100 ohms.
Easy way is to use one channel of a good hi-fi amplifier to buffer the
output of the generator and drop the impedance to near zero.
..... Phil
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