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(one more) ALEPH P 1.7 clone

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#382
Volume control

Hi, this might be allready discussed to some extend, but sometimes it´s hard to see the light in dark...

either:
did someone built avolume control on the output with a rotary switch and resistors and give me some details about construction,
values, connection points etc.

or:
did some used a rotary switch together with the least amount of relays for the same purpose and give me some hints

Thanks in advance
Michel
 
#383
I've also been looking at the options for a relay attenuator as I have an P1.7 in the build queue. I received a set of Veteran's boards from Mach.88 yesterday and I pretty impressed with the quality.

Anyway from my researching/read there are a few options..

I've been looking at both DIY and "commercial" kits...

Magnus Lubeck has some artwork and some basic pic code on his site:
http://www.skip.informatik.gu.se/~kmg/diyaudio/projects/aleph_p/welcome.shtml

Thomas Chao's diy audio page has some useful infos on implementing Till's relay control
http://www.penguinlovers.net/audio/alephp_vr.html

Till's relay volume control pages are extremely informative - problem is the links on diyaudio and elsewhere are mostly broken: This link works as at dec 5, 2006.
http://till.pm-si.com/relais/index.html

Resistor-Switch Networks for Audio Volume Control
http://jos.vaneijndhoven.net/switchr/index.html

Also take a look at Ralph Sten's beautiful Aleph P implementation:
http://www.r-stens.de/diy/AlephP/diy_aleph_p.php

For artwork/schema for a relay board, and remote receiver amongst other things:
http://stiftsbogtrykkeriet.dk/~mcs/
http://stiftsbogtrykkeriet.dk/~mcs/RelPot/index.html
kitted versions of the boards and much more are available thru:
http://electronics.dantimax.dk/
The Dantimax system looks extremely flexible and is quite reasonably priced.

Russ White's twisted pear audio also offer a commercial kits of extensible controls including a relay attenuator.
http://www.twistedpearaudio.com/

On diyaudio there are a number of threads related to relay volume control, this is the tip of the iceberg...
http://www.diyaudio.com/forums/showthread.php?s=&threadid=85321

http://www.diyaudio.com/forums/showthread.php?s=&threadid=74224

http://www.diyaudio.com/forums/showthread.php?s=&threadid=12186

http://www.diyaudio.com/forums/showthread.php?s=&threadid=30211


hope this helps

cheers
Paul
 
#384
veteran said:


Mr Martin, I only have few sets of my previous version of this boards (one PS and a little less space for electrolytic capacitors).
Click to expand...

Hi Veteran

I think I lost that train too. :bawling:
But If you please send me pdf´s of real size unpopulated PS and main board I think I could try with home transfer and etching. I´m playing my BOZ for some three years, it´s time to upgrade.

Thanks a lot for keep P 1.7 alive.

zfardo@terra.com.br

JC
 
#386
And for you Tarasque!
I went for the attenuator on the in and output directly and it worked, great man! Thanks a lot. Than I put it again in the pre, and still it did not work. I had an old switch placed in it, and got it out and put the in direct on the board, and wow what a sound I was hearing, great, airy and transparant. Thanks a lot again. When I'm ready for the finishing touch I will take some pictures and put it on the forum. have fun guys, diy audio is great. And thanks a lot Nelson for charing your know how. GRTZ Teake.
 
#387
Volume Control

To Paul
Thanks Paul, putting all this information together.
But there must be a way to control these relays without a microprocessor, like a simple diode matrix

To Teake
Thank you, may be you can send me a mail with the values you used and the hook up.
 
#388
He Michael
here is something about attenuators
 

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#389
Michael
schematics and than the 5K version, calculate it double for 10k wich one I have. Schuro Germany got the Dales. You could also buy the elma switches wich are great, two decks for mono, 4 for stereo and 8 for balanced. Good luck, Teake
 

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#391
intense-tavda said:
Again Michael look for the installation at DZ attenuator. There is also the schematic for the 10K version.
Click to expand...


Here is the 10K version of DZ attenuator that I used with the Pass Balanced Line stage. The quality might not be as good as Elma but the prize can't be beat.
 

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#392
Re: Volume Control

Michael Mik said:
To Paul
Thanks Paul, putting all this information together.
But there must be a way to control these relays without a microprocessor, like a simple diode matrix
Click to expand...

Michael,

I haven't looked into the kind of setup you describe.. From what I've seen the µprocessor route is very cost effective and far more flexible than a hardwired relay setup. I had also looked at DACT balanced stepped attenuators, but when I discovered that I could get a full house dantimax kit - remote, relay attenuator, relay input selector, LCD etc - for substantially less money I scratched stepped attenuators off the "to consider" list.

I have used a pic programmer for other no-audio projects so that makes the µproc route seem somewhat less daunting perhaps.

Paul
 
#394
He Michael!
I put it on the output and it sounds absolutly clean. Nelson Pass told something about mosfet distortion when you put it on the input. It.s very good for the price, but I think in the future I will make an double mono balance attenuator. For now it's unbalanced. And I make me an 5K instead of an 10K. Grtz Teake and mojo with your discision.
 
#396
Hi KMJ!
Well the pre is running now for one day and it sounds absolutely fabulous, very detailed, micro and macro. for a good listening and some power I have to put the attenuator on half way, but I like that, because I can take it the way where I have to use it for, attenuation! On my threshold sl10 I only had to turn it for 3 steps and it was loud anough. Now I can hear things on a lower volume too, better as before. Grtz Teake.
 
#398
Well the pre is running now for one day and it sounds absolutely fabulous, very detailed, micro and macro
Click to expand...

Great, then I'll do some rewiring and move my 10K-pot to the output instead.

I want to thank Nelson Pass, Rick Terpstra, Tarasque and all the others that it was possible to make me such an amplifier.
Click to expand...

Just wanted to mention Veteran (Damian) here to. Thanks!
 
#399
KMJ: Have you tried the NOS caps yet? I tried some in my dac and they seem to do the job nicely. Different tonality compared to the AuriCaps. Somewhat smoother with less resolution. But a hugh soundstage. Will you be testing BG Ns as well?

A big thanks to Veteran, Nelson himself and the rest of diyAudio!

Best regards,
Folke
 
#400
Hi Folke, I'm fiddling with the last parts as we speak. I'll just have to wire the pot between the inputs and the boards, install the PSU and add a chassiground. Then one more day or two for Zei to borrow me an amp. I had to leave my own at a friend place for a couple of weeks. Since Zei has the same Pre with blackgates a comparison shouldn't be hard to do.
 
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