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Old 14th January 2012, 10:30 PM   #1281
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Hello dear comunity
can anybody point to the right shematic of Aleph J-X Amp?
cant find it on the thread
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Old 17th January 2012, 12:40 AM   #1282
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You need to refer to the manual for the Aleph-J. The amp is just two J's with their front ends replaced by a common circuit posted a few days ago by Peter Daniel. If you compare the schem of Aleph-J with the X frontend you'll be able to find the overlap.

Here is the Aleph-J.
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Old 18th January 2012, 10:05 AM   #1283
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Default populating the front end pcb

Hi everyone,

Is it just me or is populating the front end pcb is difficult to souder, the souder is not attaching itself to the pcb very well for some reason, is there anything I should do about this ?

Thank You

Ian
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Old 18th January 2012, 10:28 AM   #1284
qusp is offline qusp  Australia
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I had no problems, nothing different to any average PCB, the traces are not particularly thick, there is no ground plane to suck out the heat.

try some flux and perhaps higher heat. i dont know what else to recommend because if its not working normally there is something else at play other than the pcb.

are you using quad eutectic or lead free solder? what tip? although any standard tip should be fine
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Old 19th January 2012, 05:47 AM   #1285
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You definitely should do something about this as you risc cold solder joints otherwise. Besides the poor contact itself, it leads to crackling noises.

Use more heat! Hannes
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Old 21st January 2012, 11:34 AM   #1286
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Default clean souder iron point

Quote:
Originally Posted by SCAIFF001 View Post
Hi everyone,

Is it just me or is populating the front end pcb is difficult to souder, the souder is not attaching itself to the pcb very well for some reason, is there anything I should do about this ?

Thank You

Ian
I have been keeping the soulder iron point clean, or at least I thought it was, I have sanded the tip with sand paper and the iron works great now, I never knew that I had to do this sanding of the tip, and will redo all of my saulder iron connections when this problem surfaced.

Thank You

Ian
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Old 21st January 2012, 11:41 AM   #1287
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Default mounting P1

Hi,

I am at my last item of populating the pcb(s), mounting "P1". On the pcb there is a little circle with a line through it at one end of the white mounting rectangle with three holes in it. Dose the screw for the pentiometer mount at this end, or dose it not make any differance ?

Thank You

Ian
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Old 21st January 2012, 12:47 PM   #1288
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It doesn't make any difference.
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 21st January 2012, 01:40 PM   #1289
qusp is offline qusp  Australia
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sanding the tip will eventually lead to it failing quicker than if you just keep it properly and regularly clean with brass wool
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Old 21st January 2012, 01:43 PM   #1290
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Just to remind, that functional amplifier and some additional info were presented here: Aleph J-X Amp Project
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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