No idea which audio equipment this came from...some basic tests made using some test equipment I had to hand at the time
Audio transformer
Rectangular format designed to fit inside a microphone
Measures: 19mm length x 19mm wide x 15mm height
Flying leads 40mm length - unlike the other transformers I have, these leads are solid core not stranded
Markings are non-existant I'm afraid...
I removed the outer insulation (tape) to look at the construction and hopefully gleen who made this transformer - no luck
COSMETIC CONDITION:
Excellent
TESTING (limited)
DC Resistance tests
Black/Red leads - 17.7 Ohm
Yellow/Blue leads - 64.8 Ohm
As I have a few different audio transformers that I no longer need, I decided to dig out some basic test equipment to provide more detail on the transformer characteristics
Test equipment used: AWA Low Distortion Audio Oscillator G232, Leader AC Voltmeter
Input to the transformer under test was made at 100mV @ 100Hz, 1Khz & 10Khz
Using test signal @ 1Khz, I have determined the following:
Turns ratio: 1:1.67
Impedance ratio: 1:2.79
Frequency response (a very rough test and not graphed) was flat from 1Khz to 10Khz
It would seem that this audio transformer is fine for general audio use, nothing particularly special about it though
Note that these tests were not exhaustive but at least shine a little more light on the characteristics of this transformer
