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Old 30th September 2013, 12:38 AM   #31
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Ok, I have output on all. At this point maybe I have been trying to do the impossible. My intent is to run a single coax to a single input and output 2 channels which are divided in frequency by the plug-in crossover. One running the tweeter, and one the woofer. So following your guidance, I see all inputs activate all outputs, but only one output channel is connected electronically to it's speaker, even though both output meters for 1 and 3 show signal.
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Old 30th September 2013, 08:18 PM   #32
gpapag is offline gpapag  Greece
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Hi Jack
As you understand, what you want to do can’t be done with the miniAMP in combination with the 2.1 plug-in . This is the bad news.

The good news is that it can be done with the 2 way plug-in.

I made a schematic drawing which describes in detail how to do the connections and where to place the jumpers.
The proposed solution works as is with both analog and digital sources
Cheer-up

George
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File Type: jpg Jack 2 way.JPG (107.3 KB, 137 views)
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Last edited by gpapag; 30th September 2013 at 08:37 PM.
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Old 1st October 2013, 12:07 AM   #33
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Thanks so much George. I will get the other plugin.
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Old 1st October 2013, 03:18 AM   #34
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Yeah, that was it. Sounds fine now! Thanks again.
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Old 1st October 2013, 05:13 AM   #35
gpapag is offline gpapag  Greece
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You are welcome.
Enjoy the music

George
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Old 1st October 2013, 07:39 AM   #36
gpapag is offline gpapag  Greece
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Default Info (a“must” read)

John Reekie, a member of this forum too, has presented a series of excellent articles which are of great help to anyone working on a miniDSP based system here:

miniDSP tutorials


George
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Old 1st October 2013, 08:35 PM   #37
gpapag is offline gpapag  Greece
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Today I made the first steps toward better DC powering arrangement on my stack.

A. I added electrolytics at the DC Input of each board (2x100uF63V on each miniAMP, 1x100uf/63v on MiniDSP, 1x100uf/63v on MiniDIGI.

B. The DC Input of each board is routed to the (still common) psu through separate wiring.

C. I cut the ribbon wires that connect pins 27,28 “External DC input
4.5 ~ 24VDC” of Expansion Connectors #1

D. I cut the ribbon wires that connect pins 22,24 “3.3V” of Expansion Connectors #2

These wires were cut for to isolate the power supply sections of the boards.

As I was on wire cutting, I also removed ribbon wires that connect pins 1,2,3,4,15,27,28 of Expansion Connector #2

Although all these were done in one go, in the end boards worked as they should with no fatalities
There is still absence of turn-on/turn-off thumbs.

First listening impression is that the bass is less pronounced and more controlled.
After further listening, I think that music is more clear now (better defined) on all frequencies.

George
Attached Images
File Type: jpg Caps+ribbon.JPG (388.0 KB, 123 views)
File Type: jpg Ribbon.JPG (375.3 KB, 113 views)
File Type: jpg Back.JPG (399.7 KB, 106 views)
File Type: jpg Wire cutting.JPG (85.9 KB, 106 views)
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Last edited by gpapag; 1st October 2013 at 08:39 PM.
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Old 2nd October 2013, 07:37 AM   #38
Pacogun is offline Pacogun  Australia
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Hi George,
Forgive my noobie-ness.
Is this what you are trying to do with post #37 point A? Bypass Capacitor?
The Basics - Bypass Capacitors
Paul
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Old 2nd October 2013, 12:48 PM   #39
gpapag is offline gpapag  Greece
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Paul
As long as I don’t provide measurements, whatever my answer is, it will be an assumption or a wishful thinking

Anyway, the rationale is the caps to function as local power banks (ripple reduction) on miniDSP and miniDIGI and on miniAmp as noise filter caps, for to reduce ringing and spikes at the psu-amp dc wiring caused due to wiring inductance reaction to current flow di/dt.

Capacitors is an interim step which may be of no use if individual PSUs are built and placed near the boards.

George
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Old 11th December 2013, 05:52 AM   #40
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The pictures of stack are not very clear. It can be used as an alternative power source. I guess we can use this in place of a normal inverter battery as well. Thank you for sharing this idea with us.






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