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Old 5th January 2012, 06:48 AM   #1
Sinc is offline Sinc  China
diyAudio Member
Join Date: Jan 2012
Default A prevent jitter scheme of relay attenuator


1.Ra is zhe same as Rb for any relay attenuator(8421dB or others).
2.The time for every step must be enough.
1.Is it practicable?
2.Is it already exists?
The chinese may be more detailed:
用继电器组成数控级进音量,其好处就不说了,最头疼的是其切换过程中的抖动问题(特别是采用8421级进法 )。
如图,采用AB两个镜像组,在原来级进音量后各加一级缓冲,切换时,通过Ja,Jb的配合,以达到消除抖动 的目的。


也许他们太忙,也许此法太拙,或者此法早已存在(据说,只有神才能创造,人所做的不过只是重复)。望各位前 辈高人指点一下!
Attached Images
File Type: png Schematic.png (14.5 KB, 82 views)
File Type: png Step_keep.png (4.3 KB, 75 views)
File Type: png Step_up.png (21.0 KB, 74 views)
File Type: png Step_down.png (21.0 KB, 73 views)
File Type: png Ro.png (3.7 KB, 68 views)
File Type: gif All.gif (40.3 KB, 27 views)
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Old 5th January 2012, 11:08 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Convert or add a Schmidt trigger to the opamp. The hysteresis prevents flipping back and forth.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 5th January 2012, 01:24 PM   #3
Sinc is offline Sinc  China
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Join Date: Jan 2012
Thank you!
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