[Techlunch] Line speaker transformer

techlunch at happy.emu.id.au techlunch at happy.emu.id.au
Sun Aug 30 21:04:23 EST 2015


G'day Paul,
Tongue still in cheek!
It looks like a small mains transformer Blue/Brown (mains type) on one side 3 black on the other side.
My guess 9-0-9 may be @ 150Ma or so,
Cheers,
Amanda

Sent from my iPad

> On 28 Aug 2015, at 12:02 am, techlunch at happy.emu.id.au wrote:
> 
> A safer thing to do would be to connect say 6 VAC to the low voltage winding and measure what comes out of the primary.
> 
> If it's a small speaker transformer, it may draw a bit of current even at the 6 volt 50 Hz level as that may well be its lower frequency limit. If it's a mains transformer for the Oz market, then its design frequency will of course be 50 Hz.
> 
> Paul 5BX
> 
> -----Original Message-----
> From: techlunch-bounces at happy.emu.id.au [mailto:techlunch-bounces at happy.emu.id.au] On Behalf Of techlunch at happy.emu.id.au
> Sent: Thursday, 27 August 2015 6:10 PM
> To: techlunch at happy.emu.id.au
> Subject: Re: [Techlunch] Line speaker transformer
> 
> Be brave Bill,
> If you reckon you have identified the primary, plug it in to 240V measure what volts.
> Worst that can happen is a bad small or a bang!!!!!!!!
> Cheers
> Amanda
> PS bring it to lunch tomorrow, someone might recognise it.
> 
> Sent from my iPad
> 
>> On 26 Aug 2015, at 11:37 pm, techlunch at happy.emu.id.au wrote:
>> 
>> Rob, Neil, Amanda,
>> 
>> Thanks for looking all this up.  It looks like they are definitely mains transformers.
>> I think I may have picked them up out of a clearance box many (more than 10 ) years ago and always thought they were line transformers !!
>> 
>> So now what am I going to do with them??
>> 
>> By the way, does anyone know when Gilbert gets home? I've got a couple of packets of drills here for him, and they're getting boring.
>> 
>> cheers
>> Bill
>> 
>> 
>>> On 26/08/2015 9:55 AM, techlunch at happy.emu.id.au wrote:
>>> Bill,
>>> M2480 sounds like a mains transformer.
>>> 100V line transformer are usually pair of wires on The low Z (8ohms) 
>>> On the primary three spade terminals marked c  common, 5k/2.5W, 2.5k/5.0W typical.
>>> I have only seen wires on both sides of 100V line transformers for 
>>> high power transformers 30W Plus.
>>> Cheers,
>>> Amanda
>>> 
>>> Sent from my iPad
>>> 
>>>> On 25 Aug 2015, at 9:38 pm, techlunch at happy.emu.id.au wrote:
>>>> 
>>>> Dear gentle folk,
>>>> 
>>>> Does anyone have an old (real old) Dick Smith catalogue? You know, the ones that used to have real information in them!!
>>>> 
>>>> I have a couple of transformers, which I'm pretty sure are 70V/ 100V / 8Ω.  The stock item number is M-2480.
>>>> The 8Ω side is obvious, but there are 3 wires on the HV side, so not sure exactly how its configured!!
>>>> 
>>>> cheers
>>>> Bill
>>>> 
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