Electronics > Beginners
Use for audio transformer
schmitt trigger:
It is a shielded power transformer.
With a DMM, locate the pair of terminals with the highest resistance. Apply there the AC voltage via a Variac, increasing the voltage slowly.
When the nominal voltage is reached, measure the voltage across all other terminals. Sketch a schematic.
That step will significantly increase its resale value.
fixit7:
--- Quote from: schmitt trigger on June 27, 2019, 07:34:17 pm ---It is a shielded power transformer.
With a DMM, locate the pair of terminals with the highest resistance. Apply there the AC voltage via a Variac, increasing the voltage slowly.
When the nominal voltage is reached, measure the voltage across all other terminals. Sketch a schematic.
That step will significantly increase its resale value.
--- End quote ---
I have a meter, but no variac.
What terminals are you talking about, ?
There are 9 terminals on one side and four on the other.
https://imgur.com/a/TKLTuuz
schmitt trigger:
You will have to figure out the primary wire pairs by trial and error with a DMM, as described above.
No Variac, no problem.
Put a 40 or 60 watt INCANDESCENT lamp in series with the suspect primary. If the lamp lights-up dimly or not at all, congratulations you have found the primary.
Now with the DMM figure out all of the secondary voltages and its relationships.
I.e. a secondary may be center tapped.
As others have mentioned, if you show that information in your sale listing, chances will increase exponentially that someone will become interested and make a reasonable offer.
fixit7:
--- Quote from: james_s on June 27, 2019, 07:23:34 pm ---
--- Quote from: fixit7 on June 26, 2019, 11:14:42 pm ---
--- Quote from: james_s on June 26, 2019, 11:06:48 pm ---That's not an audio transformer, that's a power transformer which likely came from an audio amplifier. Audio transformers are used for impedance matching the audio signal itself.
--- End quote ---
Thanks.
Out of the blue, for about 15 seconds, it made a sound vaguely resembling a buzzing sound.
Strange, as it has not had been powered up or anything else since I removed it from the radio which came out of a dumpster ?
--- End quote ---
You must be mistaken. There is nothing in that transformer to make a noise and it has no ability to store energy when not powered up.
--- End quote ---
It was my fitbit watch sounding an alarm. :)
It had no visual flashing and it was sitting next to the transformer.
Electro Detective:
Glad it's sorted, the last possibility left for comment was 'ghosts in the machine' :scared:
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