I get some mains hum. Perhaps caused by an earth-loop between my laptop's external screen, and the AUX-in (low-level signals) on my guitar amplifier. So in the spirit of DIY, I bought some cheap "audio isolation transformers" (https://www.banggood.com/10pcs-1300...mateur-Audio-POS-Transformador-p-1094073.html)
The "details" of the product include:
Model: EE14
AC impedance : 1300:8
Frequency Type: High Frequency
EE14 seems to refer to the E shape and size of the ferrite core. (Any clarification or confirmation on this?)
Both primary and secondary have DC resistance of about 134 ohms on my DMM.
Any guesses on what the 1300:8 means? My thinking (possibly wrong) is that impedance cannot be lower than measured DC resistance, so I struggle to read "8 ohms" into this anywhere. And I doubt this is a winding ratio. Is 1300 a frequency? Some rough attempts to measure impedance seemed to suggest the two winding impedances are the same.
I have a few of them, so I could pull one apart and count windings or look at the shape of the ferrite core, or even put some DC or AC through the thing to see when it melts. But it seems nicer if I could first understand a little more from the "specs", or more generally, how one goes about "characterizing" a transformer that may have been salvaged from a halogen light adapter or a LED driver.
Thanks
Peter
The "details" of the product include:
Model: EE14
AC impedance : 1300:8
Frequency Type: High Frequency
EE14 seems to refer to the E shape and size of the ferrite core. (Any clarification or confirmation on this?)
Both primary and secondary have DC resistance of about 134 ohms on my DMM.
Any guesses on what the 1300:8 means? My thinking (possibly wrong) is that impedance cannot be lower than measured DC resistance, so I struggle to read "8 ohms" into this anywhere. And I doubt this is a winding ratio. Is 1300 a frequency? Some rough attempts to measure impedance seemed to suggest the two winding impedances are the same.
I have a few of them, so I could pull one apart and count windings or look at the shape of the ferrite core, or even put some DC or AC through the thing to see when it melts. But it seems nicer if I could first understand a little more from the "specs", or more generally, how one goes about "characterizing" a transformer that may have been salvaged from a halogen light adapter or a LED driver.
Thanks
Peter