VC23, my new PGA2310 project - Page 11

zman01 · 27th January 2012, 11:18 PM

Hi all,

A newbie here

.

I have gone through the thread and see that there are 2 power inputs 12-0-12 and 6/9VAC on the VC23 preamp board.

I have a 12VAC power brick - can I use that to connect both points? Or do I need another power source? (Got 4-6V power adapter also)

-Zia

IBM5150 · 28th January 2012, 02:23 AM

Hi Zman - welcome! You sound like you are where I was at post #58. I used 12.6-0-12.6 and 12VDC 0.3 amp wall wart inside my case. My preamp is still working great although I no longer have the MiniDSP in it and put the VC23 in a new box.

Eric

zman01 · 28th January 2012, 02:48 AM

Eric,

Thanks for the reply - that means you are using 2 power supply units right?

-Zia

IBM5150 · 03:58 AM

Yes I considered tapping off one leg of the other transformer, but I didn't want to risk any noise or loss of performance, maybe it would be OK, not sure. See attached.

zman01 · 29th January 2012, 07:59 AM

The preamp was put together yesterday and is working fine! Thanks Eric on and others who shared details of their projects on this thread.

I have noticed one thing - if the amp (Hifimediy T4) is on before the preamp, there's a nasty pop out of the speakers when I turn the amp on. Is that normal?

IBM5150 · 29th January 2012, 02:46 PM

Glad you got it working. Yes that pop is normal. The usual order for powering components is preamp, source, then turn the amp on last. When shutting it down, turn the amp off first, then the other components - that should fix it.

Did you use a separate AC or DC power source or tap off the AC transformer?

Eric

moeder · 3rd February 2012, 01:42 PM

Hello all!

Ahead of it all, please excuse my stupid question! I just received the vc23 from audiophonics together with a transformer with 2x12v and 1x9v secondaries. The two wires from the 1x9v winding go into the 9 v post, but I end up with 2x2 lines from 12v secondaries for the 12v post on the pcb. Can i just connect any of the two together as "0" and the others as the two 12 v lines (as in: blue - yellow+blue - yellow, where blue/blue and yellow/yellow are the 12 v secondaries?)

Thanks in advance!
Timo

moeder · 5th February 2012, 05:45 PM

Never mind. Resolved.

platenspeler · 06:13 PM

Hi,

Are there differences between the board sold by Audiophonics.fr and the one available on hifimediy.com? The audiophonics website says that dipswitch 4 controls whether the preamp amplifies or not (0 dB). But the hifimediy site says that switch 4 controls a "vendor option" and switching between on/off does not seem to make any difference in max volume setting.

I ask, because I have two VC23 boards at home and both start to be quite noisy (humm) above the 00 (dB) point, and I'm looking for ways to keep the noise down.

My simple PGA2311 board with only 6-0-6 Vac power and not so expensive components is dead quiet even at high gain settings compared to this deluxe board with all its possibilities.

Maarten

Ps. I just noticed that hifimediy does not sell/stock this board anymore...

hifimediy · 14th March 2012, 06:55 AM

Hi, VC23 use a OP buffer at the input to get higher input impedance, this might lead to some hmm noise when dB level. Use a 47k resistor after input caps to ground to solve this.

27th January 2012, 11:18 PM	#101
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	Newbie with VC23 preamp Hi all, A newbie here . I have gone through the thread and see that there are 2 power inputs 12-0-12 and 6/9VAC on the VC23 preamp board. I have a 12VAC power brick - can I use that to connect both points? Or do I need another power source? (Got 4-6V power adapter also) -Zia

12th March 2012, 05:52 PM	#109
platenspeler diyAudio Member Join Date: Jan 2003 Location: Netherlands	Hi, Are there differences between the board sold by Audiophonics.fr and the one available on hifimediy.com? The audiophonics website says that dipswitch 4 controls whether the preamp amplifies or not (0 dB). But the hifimediy site says that switch 4 controls a "vendor option" and switching between on/off does not seem to make any difference in max volume setting. I ask, because I have two VC23 boards at home and both start to be quite noisy (humm) above the 00 (dB) point, and I'm looking for ways to keep the noise down. My simple PGA2311 board with only 6-0-6 Vac power and not so expensive components is dead quiet even at high gain settings compared to this deluxe board with all its possibilities. Maarten Ps. I just noticed that hifimediy does not sell/stock this board anymore... Last edited by platenspeler; 12th March 2012 at 06:13 PM.

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28th January 2012, 02:23 AM	#102
IBM5150 diyAudio Member Join Date: Sep 2010	Hi Zman - welcome! You sound like you are where I was at post #58. I used 12.6-0-12.6 and 12VDC 0.3 amp wall wart inside my case. My preamp is still working great although I no longer have the MiniDSP in it and put the VC23 in a new box. Eric

28th January 2012, 02:48 AM	#103
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	Eric, Thanks for the reply - that means you are using 2 power supply units right? -Zia

29th January 2012, 07:59 AM	#105
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	The preamp was put together yesterday and is working fine! Thanks Eric on and others who shared details of their projects on this thread. I have noticed one thing - if the amp (Hifimediy T4) is on before the preamp, there's a nasty pop out of the speakers when I turn the amp on. Is that normal?

29th January 2012, 02:46 PM	#106
IBM5150 diyAudio Member Join Date: Sep 2010	Glad you got it working. Yes that pop is normal. The usual order for powering components is preamp, source, then turn the amp on last. When shutting it down, turn the amp off first, then the other components - that should fix it. Did you use a separate AC or DC power source or tap off the AC transformer? Eric

3rd February 2012, 01:42 PM	#107
moeder diyAudio Member Join Date: Jan 2012	Hello all! Ahead of it all, please excuse my stupid question! I just received the vc23 from audiophonics together with a transformer with 2x12v and 1x9v secondaries. The two wires from the 1x9v winding go into the 9 v post, but I end up with 2x2 lines from 12v secondaries for the 12v post on the pcb. Can i just connect any of the two together as "0" and the others as the two 12 v lines (as in: blue - yellow+blue - yellow, where blue/blue and yellow/yellow are the 12 v secondaries?) Thanks in advance! Timo

5th February 2012, 05:45 PM	#108
moeder diyAudio Member Join Date: Jan 2012	Never mind. Resolved.

14th March 2012, 06:55 AM	#110
hifimediy diyAudio Member Join Date: Oct 2009	Hi, VC23 use a OP buffer at the input to get higher input impedance, this might lead to some hmm noise when dB level. Use a 47k resistor after input caps to ground to solve this.

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