Many Hi-End manufactures prefer ultra high precision volume contorl, I design a volume control module based on 16 pieces DG413and a pair AD797. Thanks to Mark Levinsion's preamlifier No.32, the layout of my module is similar to No.32's. ^_^
4-layers layout is not an easy job >_<
4-layers layout is not an easy job >_<
How about the original Mark Levinson
pics from MARK's website
Module in No.32/320s/326s
pics from MARK's website
Module in No.32/320s/326s
An externally hosted image should be here but it was not working when we last tested it.
The PCB will arrive next week, I will assemble the whole module and test then.
Anyone interest in it? ^_^
Anyone interest in it? ^_^
Similar analoge switches uses the Linn preamplifier LK-1 for their source select unit:
QuickView - DG308A, DG309 Quad SPST Analog Switches
The datasheet from DG413 is here:
QuickView - DG411, DG412, DG413 Improved, Quad, SPST Analog Switches
Do you think, that this type is still the best choice as analoge switch?
Or perhaps is a solution with discrete MOSFETs is the royal way (as substitute for relais) especially for an audio high end volume control?
Please read in this case also the follow thread:
http://www.diyaudio.com/forums/solid-state/155939-mosfet-relais.html
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one fully balanced channel each module/board
if we don't need balance or use in only single end, one module can be configurate to a stereo attenuator ^_^
I will test and figure out the performance of the assemble module with Audio Precision System Two later, espcially the real performance in ultra-low level singal conditions.
regards
bbp
The PCB arrived !!!
High definition photos please check the link in GB area #13 the second page ^_^ http://www.diyaudio.com/forums/grou...ision-volume-module-like-mark-levinsions.html
regards
bbp
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Really, really nice work!🙂
I´m interested in buiding blocks for a 8 ch preamp myself and volume control/level setting is one big hurdle.
I´m interested in buiding blocks for a 8 ch preamp myself and volume control/level setting is one big hurdle.
the OPAMP AD797AR here are used as I/V convertors, like the I/V conversion part of your DAC in the CD PLAYER/DVD PLAYER
because of the OP, the analog switches current but not voltage, that will help to 'protect' the original input signal, keep the signal in the module away from outer noise etc
I understand this. You probably won't do it but adding some extra pads carrying the output current and allowing the end user to choose their prefered I/V solution will broaden the interest towards your design. Some people are simply allergic towards opamps. Not to mention the tube crowd.
Still, a very nice design, probably way better than any 3310/2310/2320.
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