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R-2R attenuator PCB layout question
R-2R attenuator PCB layout question
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Old 14th October 2017, 09:59 PM   #51
OlegSh is offline OlegSh
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R-2R attenuator PCB layout question
Well, it was quick! I just found the cause of the issue => LCD output using I2C interface.
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Old 14th October 2017, 10:20 PM   #52
OlegSh is offline OlegSh
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R-2R attenuator PCB layout question
Problem solved. I just rearranged the LCD code and reduced unnecessary and repeated writes to the display.
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Old 15th October 2017, 08:38 AM   #53
Morde is offline Morde  Finland
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Great news! PM sent.
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My finished headphone amp projects: 1, 2, 3, 4, 5, 6
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Old 15th October 2017, 09:49 AM   #54
ElFishi is offline ElFishi  Europe
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Oleg,
where did you find the nice enclosure and knob?
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Old 15th October 2017, 10:04 AM   #55
OlegSh is offline OlegSh
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R-2R attenuator PCB layout question
Hi ElFishi,

Both are from ebay. Here are the links for the enclosure (comes with the knob which I did not like) and the massive aluminum knob. The problem with this enclosure is that the holes for the inputs are spaced 14 mm apart while most of standard RCA connectors require minimum 16mm spacing. So after a long search I found these RCA combos which fit the 14mm spacing. You'll have to make the holes 0.5~1mm wider but otherwise they fit well.

Edit: LCD display mounting holes are also nonstandard, so I had to drill new blind holes and tap threads by myself.

Regards,
Oleg

Last edited by OlegSh; 15th October 2017 at 10:06 AM.
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Old 15th October 2017, 02:09 PM   #56
ElFishi is offline ElFishi  Europe
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I had seen that enclosure, too. Thanks for pointing out the spacing glitch, very helpful.
Did I get you right, the front plate of that enclosure does have tapped holes, but not in the standard positions? Sad.
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Old 15th October 2017, 02:21 PM   #57
OlegSh is offline OlegSh
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R-2R attenuator PCB layout question
Quote:
Originally Posted by ElFishi View Post
Did I get you right, the front plate of that enclosure does have tapped holes, but not in the standard positions? Sad.
Yes, the front panel has tapped holes but in the nonstandard positions. This makes it possible to design a custom backplate and mount the LCD display on it together with the IR receiver and other controls.

Regards,
Oleg
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