Print transformers: what are they good for?

roibm · 24th April 2004, 12:32 AM

Saw some good auction on ebay, 10 pieces print transformers like pictured bellow:

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

Bill Fitzpatrick · 24th April 2004, 04:01 AM

What do you mean by "print transformer?"

roadkill · 24th April 2004, 07:19 AM

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.

peranders · 24th April 2004, 07:38 AM

They are very pratical in general!

See here

dhaen · 24th April 2004, 07:50 AM

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.

analog_sa · 24th April 2004, 07:56 AM

John

You always try to take the fun away from DIY A different approach

dhaen · 24th April 2004, 08:05 AM

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...

ARAD · 24th April 2004, 08:13 AM

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

Circlotron · 24th April 2004, 09:16 AM

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.

Thomas · 24th April 2004, 09:49 AM

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.

24th April 2004, 12:32 AM	#1
roibm Banned Join Date: Dec 2003 Location: Transylvania	Print transformers: what are they good for? Saw some good auction on ebay, 10 pieces print transformers like pictured bellow: 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

24th April 2004, 07:38 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	They are very pratical in general! See here __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

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24th April 2004, 04:01 AM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	What do you mean by "print transformer?"

24th April 2004, 07:19 AM	#3
roadkill diyAudio Member Join Date: Jan 2003 Location: Fort Collins, CO	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.

24th April 2004, 07:50 AM	#5
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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.

24th April 2004, 07:56 AM	#6
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	John You always try to take the fun away from DIY A different approach

24th April 2004, 08:13 AM	#8
ARAD diyAudio Member Join Date: Oct 2002 Location: Bavaria	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

24th April 2004, 09:49 AM	#10
Thomas diyAudio Member Join Date: May 2001 Location: Right here	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.