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Old 15th January 2010, 08:34 AM   #1
danzup is offline danzup  Romania
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Default GB for R2R audio volume / input selection pcb

Based on our succesful group-buy on elforum
Google Traduceži
I'm opening a new group-buy for diyaudio members .
Discussion thread is here on diyaudio
Yet another Volume controlers and source selections
and also here
Google Traduceži
Attached are schematic, gerbers, pcb layout, atmel software for LED and LCD display and can be downloaded from vicol-audio website as well .
:: vicol audio :: R-2R volume controller ::
For 100 PCB's, estimated pcb price is 8 euro
I'm also willing to offer Atmel ready programed, up to you needs, for an extra 5 euro .
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Old 15th January 2010, 12:56 PM   #2
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Hi,

I may be interested in the same,Am from India !! can you please indicate the shipping cost of the same ??

Am looking at PCB+Atmel !

Regards.
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Old 15th January 2010, 01:01 PM   #3
danzup is offline danzup  Romania
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Quote:
Originally Posted by SoundsGreat View Post
Hi,
I may be interested in the same,Am from India !! can you please indicate the shipping cost of the same ??
Am looking at PCB+Atmel !
Regards.
About 15 euro with assurance at receiving .
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Old 15th January 2010, 01:21 PM   #4
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Hi,

Thanks for the quick reply !!

Ouch,Will let you know ! One question (actually couple) please don't mind !

1)If I want to use this for a 7.1ch what's to be done.coz I want one for pure 2ch audio and one for 7.1ch for movies (to be connected to my 7ch power amp )

2) Is ATMEGA16-16AU ok to used instead of 8AU ?? coz if I want to do it myself (just thinking )

Thanks once again !

Regards.
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Old 15th January 2010, 01:57 PM   #5
danzup is offline danzup  Romania
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Quote:
Originally Posted by SoundsGreat View Post
Hi,

Thanks for the quick reply !!

Ouch,Will let you know ! One question (actually couple) please don't mind !

1)If I want to use this for a 7.1ch what's to be done.coz I want one for pure 2ch audio and one for 7.1ch for movies (to be connected to my 7ch power amp )

2) Is ATMEGA16-16AU ok to used instead of 8AU ?? coz if I want to do it myself (just thinking )

Thanks once again !

Regards.
1) There is a possibility in that 1 controller pcb can drive 4 stereo relay pcb which means 4 x2 = 8 channel volume , but without balance/fader .
2) ATMEGA16-8AU on this pcb.
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Old 15th January 2010, 02:00 PM   #6
danzup is offline danzup  Romania
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I have forgot that this pcb is configurable for LCD or LED volume and selection output and for shunt or r2r operation for volume !
For r2r have 64 steps with -64dB attenuation .
For shunt have only 32steps .
Everything is configurable by jumpers on pcb .
It has an encoder ( for + and - ) a selection and on/off switch .
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Old 15th January 2010, 07:18 PM   #7
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I'm in...!

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Old 16th January 2010, 02:53 PM   #8
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Hello danzup, thanks for sharing Your design!

the link on Your site:
:: vicol audio :: R-2R volume controller ::
to the 'Volume Controller datasheet' doesn`t work (at least not for me).

Therefore and as I might be interested in two R2R stereo sets, each with LED display, I have a couple of (maybe stupid) questions:

Quote:
Originally Posted by danzup
For r2r have 64 steps with -64dB attenuation
Does this mean 64 linear 1 dB steps?

Quote:
Originally Posted by danzup View Post
It has an encoder ( for + and - ) a selection and on/off switch .
I don`t get it, what is this on/off switch for? Is this to mute the output or maybe to control additional (external from the PCB) output relais (some kind of delayed output relais switching to avoid power on/off noise / humps)?


When powering on the circuit, does it remember the last attenuator and input settings?


At the schematic I noticed a switch labeled 'Remote SET'.
What is the purpose of this switch please?


What kind of remote control I`d need to make it work with this attenuator?


I guess with the LCD-display option, the selected source input is indicated at the LCD (together with the level of attenuation).
How about the 2-digit LED-display version, how can be seen which source input is selected?


Does the LED display show the attenuation level in dB?


In other similar relais attenuator designs here at diyaudio people repeatedly complained about audible clicks during engaging relais attenuators.
Could this happen with Your design also?
I don`t mean clicks or noise due to mechanical switching action of the relais themselves nor noise introduced possibly due to switching a small DC component of the input source signal but electrical noise introduced / coupled into the signal chain.


That`s it for now already
Maybe I come up with a couple of even more (stupid) questions
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Old 17th January 2010, 10:40 AM   #9
tvicol is offline tvicol  Romania
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cocolino,

I'll try to answer to your questions and let danzup to correct me.

1. We are still working on datasheet. There is lot of info on elforum and here on diyaudio. We would like to provide a datasheet with many pictures and detail instructions, making building and assembling of boards very easy.

2. Up to r-2r network, 64 steps can be linear and in this case we can not talk about 1dB steps, or logarithmic and in this case we can approximate 1dB steps.

3. We have provided the option to push encoder and in this case you can select the sources.

4. 2 digit display is very basic. Take it just like an additional option. Some people prefer LED displays and yes, when you push the encoder, you'll see which source is selected.

5. On power on will not remember last source and last volume level. I don't think that you will be happy to start with a high volume level.

6. By default any RC5 remote will be fine, but we can adapt for any type.

7. Remote set is a function who will be available in a future firmware release and basically you'll be able to set up volume-controller with any remote.
This means that volume-controller will learn you Remote set. Just set the jumper and start to push buttons on your remote. When done, confirm and remove jumper.

8. As per above, LED display will show you volume level and this is related to your r-2r network.

9. Normally you should not hear any clicks while relays are switching r-2r network or shunt network.
If you hear clicks than you should search for a DC component either from source or amplifier input.


Hope this answer your questions.

Regards,
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Last edited by tvicol; 17th January 2010 at 10:46 AM.
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Old 18th January 2010, 06:15 PM   #10
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Quote:
Originally Posted by tvicol View Post

Hope this answer your questions.

Regards,
Perfectly! Thanks for Your efforts.

I`m in for two (stereo) LED attenuator PCB sets + Controllers.
BTW, do You plan to offer complete kits also?
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