| 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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