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Old 26th February 2005, 01:26 PM   #41
Ruben is offline Ruben  Switzerland
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Balanced inputs would be great!
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Old 28th February 2005, 01:49 AM   #42
BrianGT is offline BrianGT  United States
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Well, you asked for it... I made a new version that accepts balanced inputs and uses the same input circuit as the Aleph 30/60.

The board is 0.1" wider

I can't take screenshots here very well, so I created a pdf from the gerber files with Pentalogix Viewmate and attached the pdf. The pdf shows both layers, green = bottom layer, red = top layer

Any comments?

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File Type: pdf minia-balanced.pdf (48.9 KB, 1395 views)
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Old 28th February 2005, 01:50 AM   #43
BrianGT is offline BrianGT  United States
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Seperate pages for top and bottom layer:

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File Type: pdf minia-balanced-tb.pdf (70.5 KB, 946 views)
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Old 28th February 2005, 02:28 AM   #44
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Brian,

Thought you were away this weekend. Must have brought your laptop.
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Old 28th February 2005, 02:33 AM   #45
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by kilowattski
Brian,

Thought you were away this weekend. Must have brought your laptop.
Exactly.. I am still away now in Pennsylvania, but I brought my laptop, and had a chance to use the net at my uncle's house.

Here is another picture of the layout, taken the same way as the previous shots:
Click the image to open in full size.

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Old 28th February 2005, 02:46 AM   #46
jleaman is offline jleaman  Belgium
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I cant remember but can they be run in RCA mode and or balanced ?
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Old 28th February 2005, 02:50 AM   #47
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by jleaman
I cant remember but can they be run in RCA mode and or balanced ?
Yes, for unbalanced, the input goes into the +IN. View the schematic here:
http://www.passlabs.com/downloads/ol...t/a30manr0.pdf
or
http://www.passlabs.com/downloads/ol...t/a60manr0.pdf

The resistor numbers are not all the same, but the circuitry is the same.

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Old 28th February 2005, 04:28 PM   #48
tiroth is offline tiroth  United States
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Balanced version.
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Old 1st March 2005, 01:47 PM   #49
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Bravo!!
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Old 1st March 2005, 01:50 PM   #50
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by Billc
Bravo!!
Thanks. Here is a pcb with output boards attached to it to form a pcb set:
Click the image to open in full size.

The thicker pink lines indicate scoring, so the board can be broken apart. (as far as heat dissipation, they would have to be broken apart for larger powered amplifiers)

The resistors on the output boards are 2 - 2w resistors in parallel, which deviates from the single 3w resistors used in the production Aleph amps.

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