|14th September 2015, 05:08 AM||#1|
Join Date: Sep 2009
Blog Entries: 2
R2R Shunt Volume with 3 selectable sources
HQ-R/2R VOLUME Technical 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.
please see some other designs:
The δ1 relay-based R-2R stereo attenuator
Audio Volume Relay Attenuator with IR Control
VC-03 Volume Control
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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