R2R Shunt Volume with 3 selectable sources - diyAudio
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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 14th September 2015, 05:08 AM   #1
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Default R2R Shunt Volume with 3 selectable sources

This design:

http://www.audiodesignguide.com/VolumeNew/index.html


HQ-R/2R VOLUME Technical Specifications:
Specifications:
– low tolerance 0.1% R-2R network with melf resistors
( resistors in parallel produce a pure resistor).
– attenuation in 64 steps - each step 1dB
– Input resistance ranges from 20k to
47K for a Rload of 47K.
– Output resistance ranges from
22K to 47K.
3 selectable inputs with option to edit input name
– one direct input
– display back-light programmable On/Off - if Off timeout 10s
-
20X 4 display characters for wide view
– tube menu for delaying plate voltage
- 3-modules design: Powers Supply (PS), Control and Display Unit (CDU), Relay Module (RM) in SE or Balanced modification.
-Volume attenuation by rotating optical encoder or from IR remote control.
- Input selection by rotating optical encoder or from IR remote control
- Display auto dimming with adjustable brightness level
- ONE open collector outputs for power On/Off and tube plate delay
- Main AC power on/off control
– AC power consumption, Max. 6W.


Special : The avoidance of clicks is the major improvement with respect to my original attenuator design of several years back.

in most of the design volume -32db relay at transition to -31dB, the relay volume 64 steps are emitting huge sound in the speakers, causing discomfort, not safe for the system.

I definitely settle this phenomenon, therefore, very smooth transition Volume and sound great.

This link for Video of Volume: https://www.youtube.com/watch?v=s9QEZduZavs

this complete module assembled including the aluminium remote at 250$ + shipping.

thanks


please see some other designs:

The δ1 relay-based R-2R stereo attenuator

Audio Volume Relay Attenuator with IR Control

VC-03 Volume Control
Attached Images
File Type: jpg Relay 1.jpg (144.3 KB, 339 views)
File Type: jpg relay2.jpg (83.4 KB, 331 views)
File Type: jpg relay 3.jpg (151.1 KB, 324 views)
File Type: jpg relay4.jpg (142.2 KB, 317 views)
File Type: jpg relay5.jpg (119.0 KB, 314 views)
File Type: jpg relay6.jpg (123.6 KB, 118 views)
File Type: jpg Remote-control-silver-aluminum volume.jpg (62.9 KB, 101 views)
File Type: png Shema relay R2R 64 hq.PNG (87.1 KB, 137 views)
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Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html

Last edited by quanghao; 14th September 2015 at 05:41 AM.
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Old 27th November 2015, 02:58 AM   #2
Junie is offline Junie  Philippines
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Join Date: Sep 2010
Location: UAE
This seems to be a good option for my GM preamp clone, what is the size of the LCD display? I have a Chassis but I want to know if the display will fit on the front panel.
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Old 8th December 2015, 01:01 AM   #3
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Hi Junie!

this for make it!

thanks
Attached Images
File Type: jpg R2R-VOLUME--size.jpg (197.9 KB, 120 views)
Attached Files
File Type: pdf R2R VOLUME size.pdf (41.8 KB, 11 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 24th February 2016, 04:56 PM   #4
Jaffrie is offline Jaffrie  Indonesia
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Join Date: Oct 2013
Hi Quanhao

wrote to you about this item but did not get any response from you
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Old 25th February 2016, 01:03 AM   #5
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Hi Jaffrie!

what i can help you now ?

thanks your advice!
quanghao
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 25th February 2016, 01:49 AM   #6
Jaffrie is offline Jaffrie  Indonesia
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Join Date: Oct 2013
Hi
1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?

2. Possible to link the power on to power amp as well ?

3. What is the actuall price of the complete unit as I see $200 n $ 250

Thks
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Old 25th February 2016, 01:56 AM   #7
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Hi Jaffrie!

1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?

The delay turn on for amplifier about 5s

The delay for the output about 10s

2. Possible to link the power on to power amp as well ?

yes, can use for your amplifier , but the relay on about 5A to 8A ( you can use other relay if your amplifier need big current )

3. What is the actuall price of the complete unit as I see $200 n $ 250

Price 250$ + shipping!
thanks

quanghao
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 25th February 2016, 05:33 AM   #8
Jaffrie is offline Jaffrie  Indonesia
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Join Date: Oct 2013
Thanks for the reply. Can the delay to programme for long power on time ?
Building an hybrid amp so need tube stage to be dc free before Ss amp stage powers on.

Also whats your paypal account

Thks
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Old 2nd March 2016, 02:56 PM   #9
Jaffrie is offline Jaffrie  Indonesia
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Join Date: Oct 2013
Hey Quanghao

Awaiting for your reply. Wanted to order this item but in your webshop I only see an remote
listed at 199.99 is this the item ?
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Old 2nd March 2016, 04:39 PM   #10
RollE2k is offline RollE2k  Sweden
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How does the balanced input board look?
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