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Old 24th April 2004, 12:32 AM   #1
roibm is offline roibm  Romania
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Question Print transformers: what are they good for?

Saw some good auction on ebay, 10 pieces print transformers like pictured bellow:
Click the image to open in full size.

They are rated 115-230V and 2x9 3.5A
Any ideas what could be achieved with these?
Any good for audio? Good for use in a PSU for opamps or a DAC?

thanks
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Old 24th April 2004, 04:01 AM   #2
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What do you mean by "print transformer?"
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Old 24th April 2004, 07:19 AM   #3
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I guess he means "PCB mounting" transformer.

Yes, this would be quite useful to power a preamp, DAC or crossover board.

See this thread for a picture of a DSP board which uses similar transformers.
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Old 24th April 2004, 07:38 AM   #4
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They are very pratical in general!

See here
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Old 24th April 2004, 07:50 AM   #5
dhaen is offline dhaen  Europe
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They should be used with caution on DIY kit, as their use puts mains on the PCB.
I always have mains voltages double insulated and separate from the low voltage electronics.
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Old 24th April 2004, 07:56 AM   #6
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John

You always try to take the fun away from DIY A different approach
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Old 24th April 2004, 08:05 AM   #7
dhaen is offline dhaen  Europe
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That's very funny, in coincidental way.
Compare:
Quote:
His estate or personal representative brought a §402 A product liability action,
...snip...
with:
Quote:
Q: What on earth is a 402 error?

A: This error code is puzzling. According to the HTTP specification, this code is reserved for future use and means "Payment required"
...snip..
Ok, so I'm a crank...
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Old 24th April 2004, 08:13 AM   #8
ARAD is offline ARAD  Germany
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roibm,

the transformer in the picture is a very small transformer - it is rated at 2x9V and delivers 2x 3.5 VA (not A)... what translates to a little less then 400 milliAmps per secondary.

Regards,
Andreas
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Old 24th April 2004, 09:16 AM   #9
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Default Hummmmmmm..

Quote:
Originally posted by dhaen
They should be used with caution on DIY kit, as their use puts mains on the PCB.
I always have mains voltages double insulated and separate from the low voltage electronics.
Not only for safety - you want to keep mains wiring as far away as possible from low level signal wiring.
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Old 24th April 2004, 09:49 AM   #10
Thomas is offline Thomas  Denmark
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I use a small print transformer to drive the relays and LED's in a amplifier I'm building. Good thing about this, it keeps the "foreign" circuitry out of the signal path and got the correct voltage for the relays I'm using.
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