Lampizator Sound Card

Feagil · 13th December 2012, 09:09 AM

Hi everyone

I am trying to modify my Asus Xonar Stx sound card with the Lampizator upgrade and I need some help understanding the balanced outputs. The PCM1792 has a Iout+ and Iout- for the left and right channel respectively. I think I understand I need to make 4 Lampizator circuits to convert each of those I outs in to differential Voltage outputs. The ground of the lampizator circuit must be tied to each channel's ground on the PCM1792. My amplifier currently only has inputs for RCA Single ended inputs.

How do I take these four Vouts from the I/V stage and convert them in to Single ended?

Or is there a way to take the differential output at the chip and make it single ended before the Lampizator (saving me 2 valves)? I have heard you sometimes tie I- to ground but I worry about damaging my sound card.

The link for the DAC's datasheet is here.
http://www.6moons.com/audioreviews/weiss4/pcm1792.pdf

Thanks so much for the help.

V

oshifis · 13th December 2012, 10:13 AM

A current output can be safely grounded.

Feagil · 13th December 2012, 08:23 PM

Thanks Oshifis, I suppose you are right. If I do ground Iout- would that mean Iout+ will output the whole of the signal? I can then simply build a Lampizator for the 2 Iout+ pins and ground the Iout- pins without any loss of signal quality?

Balanced outputs might be nice to have when I have the budget / knowledge to make a preamp that can take balanced inputs so I might make the 4 outputs in the end. If I do can I still simply use the Iout+ pins for the single ended RCA outputs and leave the Iout- going through the small resistor for the Lampizator without signal quality loss?

Thanks again for the help.

V

13th December 2012, 09:09 AM	#1
Feagil diyAudio Member Join Date: Apr 2012	Lampizator Sound Card Hi everyone I am trying to modify my Asus Xonar Stx sound card with the Lampizator upgrade and I need some help understanding the balanced outputs. The PCM1792 has a Iout+ and Iout- for the left and right channel respectively. I think I understand I need to make 4 Lampizator circuits to convert each of those I outs in to differential Voltage outputs. The ground of the lampizator circuit must be tied to each channel's ground on the PCM1792. My amplifier currently only has inputs for RCA Single ended inputs. How do I take these four Vouts from the I/V stage and convert them in to Single ended? Or is there a way to take the differential output at the chip and make it single ended before the Lampizator (saving me 2 valves)? I have heard you sometimes tie I- to ground but I worry about damaging my sound card. The link for the DAC's datasheet is here. http://www.6moons.com/audioreviews/weiss4/pcm1792.pdf Thanks so much for the help. V

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to mix sound from notebook and external sound card and get headphones output	burence73	Headphone Systems	17	29th December 2012 07:58 PM
Creative Sound Blaster X-Fi sound card w/upgrade	GOWA	Swap Meet	0	12th August 2012 09:05 PM
FS: LampizatOr Digi Lampizator kits (2)	Gopher2K	Swap Meet	0	7th June 2012 07:08 PM
PC sound card sound chips	kaluchka	Chip Amps	6	20th June 2011 03:48 PM
How Lampizator CD tube player sound?	Akita	Tubes / Valves	71	13th January 2011 07:47 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

13th December 2012, 10:13 AM	#2
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	A current output can be safely grounded.

13th December 2012, 08:23 PM	#3
Feagil diyAudio Member Join Date: Apr 2012	Thanks Oshifis, I suppose you are right. If I do ground Iout- would that mean Iout+ will output the whole of the signal? I can then simply build a Lampizator for the 2 Iout+ pins and ground the Iout- pins without any loss of signal quality? Balanced outputs might be nice to have when I have the budget / knowledge to make a preamp that can take balanced inputs so I might make the 4 outputs in the end. If I do can I still simply use the Iout+ pins for the single ended RCA outputs and leave the Iout- going through the small resistor for the Lampizator without signal quality loss? Thanks again for the help. V