FS: DAC output transformers - Onectics

Pano · 15th February 2010, 07:36 PM

I have for sale a few DAC output transformers. All new, never used.. See photos below.

These were custom designed for the output stage of a voltage DAC. Core is 48% nickel.
There are 1:1 ratio with with a center tap on both primary and secondary. So you could have 1:1, 2:1 or 1:2 ratios.
These are PC pin types made for fit on a PCB. They can, of course, be hand wired.

I had these made by Bud Purvine of Onetics transformers. I have listened to and tested many transformers, the Onectics have always been the best I've heard.

Cost is $45 US each, shipping to any USA address is free! For international, please inquire. Paypal in US funds preferred.

stoolpigeon · 15th February 2010, 09:20 PM

HI panomaniac,

can you put aside 1 pair for me?

Am at work now and not meant to use internet so please send me an email or I will contact you when I'm home (in about 9 hours time).

thanks, sp

Pano · 15th February 2010, 09:22 PM

Sure SP, will do.

planet10 · 15th February 2010, 09:25 PM

I want some, at least a pair, maybe more. Mail me.

I was actually going to mail you or Bud about these, i have acquired a DCX (free but with a glitch i hope Daniel can fix)

dave

gripracer · 15th February 2010, 10:37 PM

Interesting. Would these be able to combine the balanced outputs from a CS4397 into a full-voltage single-ended output?

I am currently running single-ended from the "+" output pins, straight into my amp after an MKP. Basically, I am wondering if these would improve my sound?

Pano · 16th February 2010, 04:24 AM

OK Dave. I'll email you in the morning.

Grip. Yes, these will do the balanced to unbalanced act for you. I think they sound great.

peterhenk · 16th February 2010, 05:55 AM

Hi panomaniac

Any left? What would shipping (slowwwww) to the Netherlands cost?

Cheers

Peter

Ciu · 16th February 2010, 07:51 PM

Hello!

Which impedance are they ?
Do you know primary DCR for 1:1

Thanks !

Pano · 16th February 2010, 08:08 PM

They are 1:1 ratio but deigned to be driven from a source of about 100-200 ohms into a load of about 10K or more. Typical of a voltage out DAC into a preamp or power amp.

DCR is about 50R. But that is NOT the impedance seen by the load - except at DC. At anything about 15Hz, the source will see the approx. the impedance on the secondary.

BTW, dimentions are: 36x29mm 29.5mm high, including the pins.

qusp · 19th February 2010, 02:07 PM

any left?

15th February 2010, 09:25 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I want some, at least a pair, maybe more. Mail me. I was actually going to mail you or Bud about these, i have acquired a DCX (free but with a glitch i hope Daniel can fix) dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

16th February 2010, 04:24 AM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	OK Dave. I'll email you in the morning. Grip. Yes, these will do the balanced to unbalanced act for you. I think they sound great. __________________ Take the Speaker Voltage Test!

16th February 2010, 05:55 AM	#7
peterhenk diyAudio Member Join Date: Apr 2008	any left? Hi panomaniac Any left? What would shipping (slowwwww) to the Netherlands cost? Cheers Peter

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15th February 2010, 09:20 PM	#2
stoolpigeon diyAudio Member Join Date: Feb 2007 Location: Laputa	HI panomaniac, can you put aside 1 pair for me? Am at work now and not meant to use internet so please send me an email or I will contact you when I'm home (in about 9 hours time). thanks, sp

15th February 2010, 09:22 PM	#3
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Sure SP, will do.

15th February 2010, 10:37 PM	#5
gripracer Banned Join Date: Mar 2009 Location: Atlanta, GA	Interesting. Would these be able to combine the balanced outputs from a CS4397 into a full-voltage single-ended output? I am currently running single-ended from the "+" output pins, straight into my amp after an MKP. Basically, I am wondering if these would improve my sound?

16th February 2010, 07:51 PM	#8
Ciu diyAudio Member Join Date: Feb 2005 Location: Northern France	Hello! Which impedance are they ? Do you know primary DCR for 1:1 Thanks !

16th February 2010, 08:08 PM	#9
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	They are 1:1 ratio but deigned to be driven from a source of about 100-200 ohms into a load of about 10K or more. Typical of a voltage out DAC into a preamp or power amp. DCR is about 50R. But that is NOT the impedance seen by the load - except at DC. At anything about 15Hz, the source will see the approx. the impedance on the secondary. BTW, dimentions are: 36x29mm 29.5mm high, including the pins.

19th February 2010, 02:07 PM	#10
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	any left?

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