Transformers On the CHEAP - Power Transformers
« on: May 23, 2009, 03:51:10 PM »
I was reading a little and found this thread:
http://www.groupdiy.com/index.php?topic=5513.0

Here it's mentioned that small toroidal transformers can work good for audio.

I'm considering building the EZ1270 (edit 1290 whoops!) Neve project. Does anyone know the ratio I'd need if I were to try this idea?

thanks!
Nick
« Last Edit: May 23, 2009, 04:30:36 PM by 777funk »


shabtek

Re: Transformers On the CHEAP - Power Transformers
« Reply #1 on: May 23, 2009, 04:23:57 PM »
what is EZ1270?
input or output?
don't think so.
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

kazper

Re: Transformers On the CHEAP - Power Transformers
« Reply #2 on: May 23, 2009, 04:29:17 PM »
I'd say it's 20 short of the EZ1290.

It may work on the input but you will not have the Neve sound. You want that sound then get the correct iron.
« Last Edit: May 23, 2009, 04:31:50 PM by kazper »
Intentionally left blank

Svart

Re: Transformers On the CHEAP - Power Transformers
« Reply #3 on: May 23, 2009, 04:34:15 PM »
That's interesting.  I had forgotten all about that thread.  Thanks
Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

Re: Transformers On the CHEAP - Power Transformers
« Reply #4 on: May 23, 2009, 04:39:21 PM »
Another thing I just found>:
http://www.alliedelec.com/Power-Products/Transformer/?N=4294820244+4294799185

Allied has some really low cost transformers. Worth a try? Anything there?

It seems like many great products were founded on a cheap design regimen (Original MArshall amp trannies, LA2A, Fender's amps and guitars, Jensen speakers, etc). So... cheap doesn't have to be bad.

Hopefully this will turn into an interesting thread.

shabtek

Re: Transformers On the CHEAP - Power Transformers
« Reply #5 on: May 23, 2009, 05:11:41 PM »
iron and copper used to be cheaper and made better in general ; and silicon expensive and noisy if available
probably not going to have much luck with those telecom/data transformers to pass full bandwidth audio
I am assuming you meant ez1290-- output needs a gapped transformer, input needs a mic transformer, I don't know the ratio.
there will be a group buy coming up for an output that will work.
without the right iron you probably won't get the right sound.
iron is not intrinsically going to sound good. for experimentation/color breadboard up a simple mic amp like
http://sound.westhost.com/project13.html to test input iron
and maybe  http://www.jlmaudio.com/JLM%20Hybrid%20Opamp%20circuit.pdf
to drive  experimental output iron

"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

PRR

Re: Transformers On the CHEAP - Power Transformers
« Reply #6 on: May 24, 2009, 02:48:38 AM »
> really low cost transformers. Worth a try? Anything there?

These Red Dot parts have been around for 40 years. This line used to say "CPS".

Frequency Response: + 2.0 DB, at 300 Hz to 100K Hz

Many musicians will not be happy if you cut off three octaves of bass.

You can get deeper bass if you drive with a very lo-Z source. A zero-Z source may actually get near 40Hz.

The 50mW (+17dBm) rating applies at 300Hz and some fairly high THD. The power rating declines 6dB per octave: : -1dBm at 37Hz.

With a 200 ohm dynamic mike into the 600r winding, you might get below 100Hz and more level than a dynamic has.

But the best use for these things is the original: walkie-talkies and pulse circuits.

There are also the modem transformers, with very tight phase-shift specs, but bass response at least as bad or worse.



 

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