some of you know me, that i like to play around and experiment and sometimes burn things!
So.. i want to measure some audio transformers, the problem is that the way i'm connecting them is totaly wrong!
Sound card speaker out > audio transformer output (~4ohm impedance) > audio transformer input (~3Kohm) > sound card line in.
Although with the above way i can use RMAA to take some measurements...i have the feeling that they are not acurate since it looks wrong, but no other way worked for me!
The transformers he is using are 1:1 and 1:2 turns ratio with maybe 600Ω impedance. The one you appear to have (3000Ω/4Ω impedance) is a 1:750 turns ratio which will give you different results.
The transformers he is using are 1:1 and 1:2 turns ratio with maybe 600Ω impedance. The one you appear to have (3000Ω/4Ω impedance) is a 1:750 turns ratio which will give you different results.
You can use a power amplifier to drive the transformer at a fairly low level at first, then measure its output with an oscilloscope or audio voltmeter.
Of course you must load the transformer according to its spec's.
You can use a power amplifier to drive the transformer at a fairly low level at first, then measure its output with an oscilloscope or audio voltmeter.
Of course you must load the transformer according to its spec's.
You can use a 5.1V zener diode back-to back to an ordinary diode to protect the input of your sound card from the very high voltages produced by your backwards transformers.
But I don't know why you are measuring lousy old transformers.
whiz115,
Why don't you try to find a 600Ω line matching transformer instead? You can find them in scrapped modems or most things that interface with a phone line. It sounds like you want a high quality transformer which has a good frequency response in the audio band, so the one out of a modem probably won't be good enough but you could have fun testing it.