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Old 23rd October 2004, 08:08 AM   #1
digi01 is offline digi01  China
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Default digital volume pot project

the digital volume control design that I and my friends developed together.it almost be finished.
the circuit is to utilize a programmable mcu to control a group of relays to deal the switching of R-2R mode.and it has been set up a extend interface,for using those PGA chip such as PGA2310.

here is the R/2R Ladder Networks article.
the test version used six relays.steps of switching is 2^6=256.

sch pdf file:
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Old 25th October 2004, 07:22 AM   #2
digi01 is offline digi01  China
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the design is finished.any comments are welcomed

pic show
1,main PCB board
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Old 25th October 2004, 07:24 AM   #3
digi01 is offline digi01  China
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2,LCD and remote LED setting up,I will do a test now.wish it can work fine.
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Old 25th October 2004, 07:39 AM   #4
Thomas is offline Thomas  Denmark
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Default Re: digital volume pot project

Quote:
Originally posted by digi01

the test version used six relays.steps of switching is 2^6=256.

2^6 = 64
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Old 25th October 2004, 07:51 AM   #5
digi01 is offline digi01  China
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Default Re: Re: digital volume pot project

Quote:
Originally posted by Thomas


2^6 = 64

Thomas,you are right.this test version is 64 steps
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Old 26th October 2004, 04:14 AM   #6
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2^6 = 64
looks like it is 128 steps control
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Old 26th October 2004, 04:22 AM   #7
jleaman is offline jleaman  Belgium
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ill buy a board.. i like the layout alot : O ) perfect for a gain clone pre-amp.
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Old 27th October 2004, 01:58 AM   #8
digi01 is offline digi01  China
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Quote:
Originally posted by gmphadte
2^6 = 64
looks like it is 128 steps control
It should be 64 steps.
I have used six relays for R-2R ladder networks and four relays for input selecting.the mcu controls these relays through 6 I/Os.
#volume control trace:MCU(AT98S8252,eprom including)=>U6 ULN2003A(interface darlinton driver)=>relays(K1-K6)
#4 signal source trace:MCU=>U5=>relays
#mute:the control signal comes out from mcu, lead to outside interface.there is no relay for mute control on the main board.

digi
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Old 27th October 2004, 02:30 AM   #9
digi01 is offline digi01  China
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Quote:
Originally posted by JasonL
ill buy a board.. i like the layout alot : O ) perfect for a gain clone pre-amp.
thank you
the compatible test of hardware and the strong test of software that I have already done,the result is very ideal.
here is some specification:
#64 steps R-2R ladder networks volume control
#4 input selecting
#mute
#volume state keeps after switch off
#LCD 16*2,compatibility HD44780 VFD
#infrared ray remote control available

MCU AT89S8252
Developing tools is Keil,C language.

here is the remote control pic:
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File Type: jpg remote.jpg (30.0 KB, 3670 views)
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Old 27th October 2004, 03:44 AM   #10
troystg is offline troystg  United States
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Hey digi01-

This looks like a neat project.

Will you be offering this as a kit with all the needed parts to assemble?

If so, I'm in.

Also, when will a Multi-channel version be available?
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