5v333
Well-known member
Found it!
Cheers!
http://vintagewindings.com/products/TransDesign1.html
Cheers!
http://vintagewindings.com/products/TransDesign1.html
Definitely...5v333 said:attached is a pic of how i measure without any termination except for the impedance set resistor. this is wrong?!
As I wrote, the frequency response of a xfmr depends on the source and termination impedance. If you want a significant measurement, it must be done in the same conditions as the ones you're going to use it.you mean i should measure right off the generator output?
If you used REW, you could save all the measurements.i forgot to check which way the phase curve went of course when i did the sweeping!!!!
You're interested in evaluating the response from the source to the secondary; that's how it will perform in practice. So the input probe should be at the output of the generator and the output probe at the grid(s). In fact the output probe should be a differential one across the whole secondary. Note that the impedance of the probing circuit will alter the response somewhat.5v333 said:to place the transformer in test, in a similar enviorment as the actual circuit (thats what the resistor was trying to mimic ) is nothing new for me but not measuring across the pri directly was new stuff for me...
maybe we should put it together with the rest of the circuit infront of it. attached is the equivalent of the eq when filters are flat.
if i inject a signal at the very begining of the first transformer via a 100R resistor. were should i put my probes when measuring the phasesplitter?
Using REW limits the frequency range to 24kHz, so not useful for evaluationg ultrasonic resonances anyway. In addition, the typical low-ish (10-20kohm//several hundred pF) impedance of soundcards disqualifies them.trobbins said:OP wouldn't be using REW I'd expect for these particular tests, and would have to have a good soundcard and probes in a good setup to look at output HF response.
Ther are no such things as differential probes; it's a shortcut to describing the use of standard probes connected to two inputs that are set in difference mode.5v333 said:thanks for not giving up on me!!
well i havnt got a diff probe so i guess i have to do with regular probes for now..
No, you measure the input at the generator, before the 380r resistor.so if i wanna evaluate the response of the phasesplitter when in actual circuit, do i measure right at the priamary and secondary then?
If you do that, you measure both teh input xfmr and the phase-splitter xfmr.5v333 said:there is no 380R in the actual circuit..!
im talking about measure the phasesplitter together with the 3 resistor pad and the input transformer in front of all that. fed by a 150Z signal.
This is correct, you will evaluate the phase-splitter xfmr, with its working source impedance ant its working load.5v333 said:ive been trying to have ref probe just after the input transformer and the other probe just after the phasesplitter. phase response looks more sane this way.
Metrology and measurement techniques is a vast subject; I'm too old to start a book.5v333 said:its fairly basic actually but still i cant find about theese stuff on the internet... i encurige you or someone else to write some small text about measuring and working with transformers when designing circuits.
Yes; that would be correct in describing the actual operation; however the tube characteristics are an important parameter here.if we want to evaluate the OT in the circuit, should we hang a ref probe at the phasesplitter sec and the other probe on the output of the OT?
abbey road d enfer said:Using REW limits the frequency range to 24kHz, so not useful for evaluationg ultrasonic resonances anyway. In addition, the typical low-ish (10-20kohm//several hundred pF) impedance of soundcards disqualifies them.
Yes it works well using an asio driver with my emu 0404, which provides a 1 megohm input to allow 10:1 and 100:1 scope probes for simple amplifier testing with a 96kHz bandwidth.ruffrecords said:The latest version of REW supports sample rates up to 192KHz.
CJ said:all you need is ears,
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