What is this type of electronic item? Transformer but there is no rating on it. - Page 1
Forum section: electronics / beginners

author: IceXcube84
author_rank: Newbie
timestamp: April 29, 2016, 07:55:19 am
content: Does anyone know what this is for electronic item?I have try to do google search on SEC Prim but a can't find anything.Here is a link to all pictures a have take of the item in question.http://imgur.com/a/n4tMaI found it for more then 15 years ago when my mother and his sister and brothers did clean out my grandfather that was a electronic engineer and a chemistry.His home was full of different electronic equipment and so on but a was to young then and did not have access to anything else then the stuff they throw in the container and a did take some smaller stuff like this. It look cool and old back then but if it is still useful then why not use it to something small

author: ElektroQuark
author_rank: Unknown
timestamp: April 29, 2016, 08:01:36 am
content: It's not a brand name.It is a transformer.PRIM: primarySEC: secondary.

author: IceXcube84
author_rank: Newbie
timestamp: April 29, 2016, 08:03:56 am
content: Quote from: EdoNork on April 29, 2016, 08:01:36 amOh thank you for the fast replyThat was very helpful.I was thinking it must be a transformer but better to ask and see if somebody else know what it is.Do you think a can use it something?

author: Gyro
author_rank: Super Contributor
timestamp: April 29, 2016, 08:24:34 am
content: That's almost certainly an audio transformer from a 1920s valve wireless. It's probably the output transformer for stepping down the impedance from the final valve stage to drive headphones or a sensitive speaker.You could probably try making a simple very low power single stage mono amp with a distinctly vintage sound.You will learn more by measuring the winding resistances and also by measuring the edit: Primary voltage with VERY LOW ac voltage (1V or so) applied to the edit: Secondary to get the turns ratio.Whatever you do don't be tempted to put mains or high voltage on it!

author: Brumby
author_rank: Unknown
timestamp: April 29, 2016, 01:12:13 pm
content: Firstly, yes, it is a transformer.With the screw terminals, I am thinking it might be more of an educational unit. To find out what you could use it for will require some tests to try and identify its characteristics.Part of those tests will be checking the turns ratio - done by applying a know AC voltage to the primary and measuring the voltage on the secondary. As stated above, definitely do NOT use mains for this! The 1 volt mentioned would be a safe place to start.

author: nfmax
author_rank: Super Contributor
timestamp: April 29, 2016, 01:38:44 pm
content: Probably the terminal labels are meant to be 'T' = telephones (meaning headphones); 'P' = plate (or anode) of the output tube (valve); and '+' = positive of the B supply (HT supply).

author: Gyro
author_rank: Super Contributor
timestamp: April 29, 2016, 03:42:01 pm
content: I didn't spot the terminal markings, yes almost certainly. That probably confirms that it from a headphone wireless rather than later speaker one.P.S. Something like this:http://www.r-type.org/articles/art-026.htm

author: Delta
author_rank: Super Contributor
timestamp: April 30, 2016, 12:25:57 am
content: Certainly an old audio transformer. Might be worth a few Crowns if you can find a vintage radio enthusiast!