Hi all
sorry it has taken me so long to get to this ... always sooo busy.. :sad:
my design has the trafo in the cable so removing it from the path was easy ...
i roved it and measured resistance using my DMM ...
My DMM has an accuracy one decimal place. ( 1/10 of an ohm)
my DMM has a resistance of .3 ohms (the leads to the dmm put together should read zero but there is no calibration option for this DMM)
my total reading was .6 ohms ..
minus the error created by the DMM that would be
.3ohms .. which is very cose to the .25 ohms required by the sowter 1:40 trafo ...
OK assuming the trafo i have is not the perfect trafo for my ribbon mic ..
how is this incorrect trafo affecting my signal?
ALSO i was reading on r*oyers website that transducers are measured for resonant frequency and them matched to trafo's depending on their measurement on a military inductance bridge ...
this might as well be a foriegn language to me ... what does this mean?
i guess what i am asking is :
what is the realtionship between ribbon resonant frequency and inductance of the trafo?
i have been working on getting the audio files .. i need upload space .
MATTA: thatnks for pointing out that high frequency ... after you mentioned it it was quite clear once i was listening for it ... i still think it is a computer related anomaly ...
i have aquired a specrum analyzer and it is a very noticeable spike in the extreme high end of the frequency spectrum ..
this has led me to a decision as follows:
realizing that the electronics present some audible noise artifacts seperate from the mic ..
i will record a sample of the mic preamp and and present it along with it's spectrum alalysis ..
i will then record a short segment with NO audio source demonstrating the mics self noise ... and include that spectrum analysis
if there is a way to subtract the preamp noise from the rest of the signal that would be cool. ( i don't know how to do this)
is there a computer program for this for mac?
then i will record different single note tones from my acoustic guitar .. including some high frequency harmonics ..
i would like to get a sample of white noise ... my amps and speakers have errors too (not to mention room interference) so i don't know how useful that would be .. ???
a lot of my equipment is in storage so getting a resonant frequency may take a bit more time ... sorry ...
is there some conclusion i can draw from test results (or just listening) that may suggest my current aproximate resonant frequency?
i managed to find my freqency generator but ... arghhh no leads ..
my apologies in adance for my limited knowledge on these subject ... your patience and understaning are sincerely appreciated.
thanks for all your help.
as always you help suggestions and kind comments are always welcome
thanks
ts