Electronics > Beginners

Use for audio transformer

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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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