GB for R-2R Volume Controller with 4 inputs - diyAudio
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Old 11th August 2014, 07:30 AM   #1
tvicol is offline tvicol  Romania
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Default GB for R-2R Volume Controller with 4 inputs

In the last months I got few requests for our R-2R volume controller so here we go.
Please note this is ONE TIME GROUP BUY. I'm quite tired after last Shiga MKII, so please bear with me.

Group buy target is minimum 50 pcb boards in order to get them in production at a decent price. List will be open for subscription till 31. August.
Payments 1st September - 15 September. Shipping starting with 1st November.

Please do not subscribe if you do not intend to honor this GB.

Specifications:
– low tolerance 0.1% R-2R network with melf resistors
– attenuation in 64 steps - each step 1dB
– Input resistance ranges from 20k to 1M for a Rload of 1M.
– Output resistance ranges from 9.75k to 10.5k.
– 4 selectable inputs with option to edit input name
– one direct input
– Infrared RC5 autolearning (can be used with any RC5 compatible universal remote)
– display back-light programmable On/Off - if Off timeout 10s
- large display characters for wide view
– tube menu for delaying plate voltage
– two open collector outputs for power On/Off and tube plate delay (see schematic J7 connector)
– AC power consumption, Max. 6W

All boards are gold plated, 75um Cu, white soldermask. See below attachments.
I'll offer this in three variants:
1. bare pcb - no parts / 25 euro
2. bare pcb board with programmed microcontroller / 35 euro
3. full mounted and tested / 149 euro

For option 1 and 2 shipping price is 8 euro world-wide.
For option 3 please see shipping prices up to 1Kg

Full mounted board come with 40cm ribbon cable soldered on both sides, Takamisawa relays, Vishay 0.1% MELF resistors.
All boards come with pre-programed microcontroller and will display <diyaudio> at each very first start, uless you order a custom firmware.


In case you want custom name on display please add 10 euro to your order.
If you intend to use this project for multichannel, you can extend up to 8 stereo channels (16 mono channels or 8 balanced channels). Please note that multichannel may require special firmware and extra parts including a modded power supply.


Schematic -> http://vicol-audio.ro/img/volume-con...d_20101406.pdf
Please note LME49610 buffer is not included.

Firmware -> http://vicol-audio.ro/img/volume-con..._v3_11.hex.zip

BOM -> https://docs.google.com/spreadsheets...#gid=200772394

Documentation -> http://vicol-audio.ro/img/volume-con...onnections.pdf

PCB dimensions -> http://vicol-audio.ro/img/volume-con...dimensions.pdf

More information -> vicol audio : r-2r volume controller

Diyaudio thread -> Yet another Volume controlers and source selections




Click the image to open in full size.Click the image to open in full size.

Please register your username and number of boards/kits here.
https://docs.google.com/spreadsheets...it?usp=sharing

Regards,
Tibi
Attached Images
File Type: jpg 20140811_002.jpg (950.5 KB, 776 views)
File Type: jpg 20140811_003.jpg (648.7 KB, 747 views)
File Type: jpg 20140811_004.jpg (743.2 KB, 727 views)

Last edited by tvicol; 11th August 2014 at 07:52 AM.
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Old 11th August 2014, 07:04 PM   #2
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Default Cant edit the google doc ti put in an order!!

Hi! Im super interested in a full kit. for a stereo balanced version.
But i cant edit the google docs tu put in my order. How can i do this? Thanks very much!
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Old 12th August 2014, 09:01 AM   #3
tvicol is offline tvicol  Romania
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Sorry, now document is editable as well.

Regards,
Tibi
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Old 12th August 2014, 09:14 AM   #4
hearNew is offline hearNew  Thailand
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Really glad to see this happening after so long awaited! I'm interested to order a balanced stereo version also, which I understand that 2 relay boards are needed. How would I need to fill in the form? Thank you.
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Old 12th August 2014, 05:47 PM   #5
tvicol is offline tvicol  Romania
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Quote:
Originally Posted by hearNew View Post
Really glad to see this happening after so long awaited! I'm interested to order a balanced stereo version also, which I understand that 2 relay boards are needed. How would I need to fill in the form? Thank you.
In case you want to build yourself, than select one PCB + microcontroller and one simple PCB.
In case you want a fully tested pcb, than see last column F.


Regards,
Tibi
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Old 14th August 2014, 08:53 PM   #6
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Join Date: Dec 2011
Hi Tibi,

Thank you for organizing this group buy. I've added my name to spreadsheet.


Kind regards,
Audionootje
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Old 15th August 2014, 02:27 PM   #7
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Is the price for balanced version the same as for the unbalanced stereo version?
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Old 15th August 2014, 10:01 PM   #8
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Hello

The price seems to be 268 for balanced, just hold the mouse over the name in the spreadsheet and it will show..

The price for bare pcb comes up as 35...thought it was 25?..

Gisle
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Old 16th August 2014, 06:33 AM   #9
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Thanks for the clarification.
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Old 16th August 2014, 07:03 AM   #10
tvicol is offline tvicol  Romania
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Yes, price for balanced stereo is 268euro and you can get the price by holding the mouse over the column name in the spreadsheet.
The spreadsheet is open to everyone for editing without authentication. Please do not alter the file other than adding your name and number of boards you are committing to buy.

I'll write prices here again for record:
1. bare pcb - no parts / 25 euro
2. bare pcb board with programmed microcontroller / 35 euro
3. stereo full mounted and tested stereo / 149 euro
4. balanced-stereo full mounted and tested / 268 euro

Regards,
Tibi
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