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Old 24th October 2013, 03:07 PM   #21
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Yes, the wirepads in the component list correspond to identifiers in the schematic.
I thought XL-JMP and XR-JMP would be jumpers (and maybe they are on the PCB) but they are the crossfeed-to-gain-stage connections to RIN and LIN at the far left of the schematic, if I'm understanding the configuration correctly. It looks like only a dozen or so of the wirepads are for the panel-mounted components, namely the switches for the crossfeed circuit and the DC (with 12V regulators DCin needs to be 30-35 volts) power jack. There is no power switch or volume control. I don't know what GBY and GLEV are other than CAD placeholders.
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Old 25th October 2013, 12:04 AM   #22
Yurk is offline Yurk  United States
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Quote:
Originally Posted by sofaspud View Post
Yes, the wirepads in the component list correspond to identifiers in the schematic.
I thought XL-JMP and XR-JMP would be jumpers (and maybe they are on the PCB) but they are the crossfeed-to-gain-stage connections to RIN and LIN at the far left of the schematic, if I'm understanding the configuration correctly. It looks like only a dozen or so of the wirepads are for the panel-mounted components, namely the switches for the crossfeed circuit and the DC (with 12V regulators DCin needs to be 30-35 volts) power jack. There is no power switch or volume control. I don't know what GBY and GLEV are other than CAD placeholders.
You are correct! Oh, GBY and GLEV were there in case one needed to ground the bypass or level switches (in case of hum pickup), and they weren't using the case for a ground. All of the different connections are explained better in the ExpressPCB schematic, I haven't added them to the Eagle schematic yet. I'll see if I can get time to do that.

I wanted this board to be flexible, which is why there are so many options as to what needs to be stuffed and which holes lead to jumpers or to actual components. Sorry for all the confusion.
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Last edited by Yurk; 25th October 2013 at 12:08 AM. Reason: human
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Old 25th October 2013, 12:31 AM   #23
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Not necessary to apologize. Thanks for clarifying. You ought to consider eventually fleshing this worthwhile project out a little with a proper component list, parts substitutions, enhanced option descriptions, pics, and that sort of thing. I have several hpa's but none with a crossfeed. I may give this a go myself.
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Old 25th October 2013, 12:33 AM   #24
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Default Here's the revised schematic

I added some info into the schematic, hopefully it clears up more confusion than it creates.
Attached Files
File Type: zip CMOY_sch.zip (67.9 KB, 22 views)
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Old 25th October 2013, 12:35 AM   #25
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Quote:
Originally Posted by sofaspud View Post
Not necessary to apologize. Thanks for clarifying. You ought to consider eventually fleshing this worthwhile project out a little with a proper component list, parts substitutions, enhanced option descriptions, pics, and that sort of thing. I have several hpa's but none with a crossfeed. I may give this a go myself.
Thanks for the encouragment. I will get a parts list up soon, I haven't actually built this board yet though. One of you may beat me to it.
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Old 25th October 2013, 01:30 AM   #26
Yurk is offline Yurk  United States
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Default Board file

Oops, here's the newest board file with the extra hole by MGND needed to tie the grounds together.
Attached Files
File Type: zip CMOY_brd.zip (13.4 KB, 14 views)
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Old 25th October 2013, 02:44 AM   #27
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Default BOM

This should be a basic parts listing, of the entire board stuffed (with exception of the TLE). Broke the BOM down into Power supply, amplifier, and crossfeed sections.

Will still need to acquire ~30VDC power supply, and an enclosure. Was intending for this to be on a bench, not really portable. You could make it more portable with switch/power selection.

This is an Excel file, but will open with Open Office also.
Attached Files
File Type: zip A47.zip (7.5 KB, 16 views)
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Old 1st November 2013, 11:55 PM   #28
Yurk is offline Yurk  United States
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Forgot a jumper note in the schematic.

Mods, could we change the title to Crazy A47 board? Thanks.
Attached Files
File Type: zip CMOY_sch.zip (67.9 KB, 15 views)
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Last edited by Yurk; 1st November 2013 at 11:57 PM. Reason: still human
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Old 2nd November 2013, 12:04 AM   #29
Yurk is offline Yurk  United States
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Ideas for different ways to load the board, with graphics! Any part in black is needed for that particular configuration.
Attached Images
File Type: jpg a47 simple.jpg (121.7 KB, 112 views)
File Type: jpg a47 simple with crossfeed.jpg (125.4 KB, 113 views)
File Type: jpg a47 discrete rail splitter.jpg (122.2 KB, 86 views)
File Type: jpg a47 discrete rail splitter with crossfeed.jpg (126.0 KB, 86 views)
File Type: jpg a47 more power.jpg (123.0 KB, 82 views)
File Type: jpg a47 more power wth crossfeed.jpg (126.9 KB, 9 views)
File Type: jpg a47 off board power.jpg (120.4 KB, 7 views)
File Type: jpg a47 off board power with crossfeed.jpg (124.4 KB, 9 views)
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Old 5th November 2013, 12:51 AM   #30
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Hi Yurk,

How do you connect MNGD to GND/AGND if you use your first design? Can i just hardwire these grounds?

Thanks,
Alexander
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