New Aleph Mini PCB GB - Page 103

jleaman · 5th May 2007, 01:25 AM

1) you would never even know if the cap was in backwards or not, it is extremely hard to know the difference in sound.

2) run 2/3 shielded wires from your input right to the board, depending if you are running balanced or line level. then run your 3 wires for your power right to the psu board. twisting / braiding really helps.

3) i can post pictures later on when i arrive hoe if you wish. I run 4 of these amps ( smd ) ones tho.

Jase

hayenc · 5th May 2007, 02:00 AM

I checked the silkscreen on the old and new boards I have. C1 is fixed on the new boards.

jleaman · 6th May 2007, 01:24 AM

Quote:

Originally posted by hayenc
I checked the silkscreen on the old and new boards I have. C1 is fixed on the new boards.

Very good to know, thanks.

J'

gil-garcia · 18th May 2007, 07:35 AM

Hello,

j'am,just starting to realize a 5 channel Mini A with PCB and PSU from chipamp. It is the most beautifull pcb j have never seen .
One small problem, impossible to find in europe the small resistances.

The project is :

2 transformers 300VA, 2x15V (one for front two channel and one for the others tree channel)
4 PSU board (2 for the front channel, 2 for the 3 others channel)

As j am a beginner and as j have read a lot of thread with the impression that everybody do not speak always about the same schématic and references of resistors j am a bit lost.

Can you help me

Accordind to the part list from the site :

R6 optional, for closer matching of Q1 and Q2

R12 : 750 initial value, could be optimized for expected power/load conditions
R13 : 47.5K initial value, could be optimized for expected power/load conditions

R17 : 100 initial value, could be optimized for expected power/load conditions

j would like to have a bias about 1,3 with something like 18-20V with my 2X15V transformer.

Could you tell me the values for R6, R12, R13 and R17. Do j have others componants to change the value.

in this configuration, could you tell me what would be the best configuration in order to connect the psu board, which value for the res of the psu (pi filter), what kind of condensator and value at the end of the psu. If it is necessary, j have others psu boards in advance.

Thanks a lot and excuse me for my poor english, j hope it is clear?

Elkaid · 16th April 2008, 10:42 PM

Hello everyone,

I'm trying to get my hand on the excel spreadsheet found on Brian's website but it seems down along www.chipamp.com.

If anyone has it near, it would be very appreciated

Thank you !

sandstorm33 · 17th April 2008, 04:57 AM

Quote:

Originally posted by Elkaid
Hello everyone,

I'm trying to get my hand on the excel spreadsheet found on Brian's website but it seems down along www.chipamp.com.

If anyone has it near, it would be very appreciated

Thank you !

EMAIL ME!

ssmith · 17th April 2008, 01:33 PM

here

Elkaid · 17th April 2008, 07:28 PM

Thanks a lot to both of you guys

Have a nice day !

BrianGT · 7th May 2008, 12:16 PM

FYI, I have more of black Aleph pcb sets, and put them back up on the website for $9 a pcb set.

(set still includes 2 amp boards and 4 output device boards)

Here is the parts list that I generated back in 05 when the first run of boards were made:
http://www.chipamp.com/diyaudio/mini...parts_list.xls
Let me know if you spot any issues, and I can correct it. I built a set of MiniA amps with the list, and had no issues.
Here is a newer one that I found that has a bit more detail:
http://www.chipamp.com/diyaudio/mini-A.xls

--
Brian

guitvinny · 7th May 2008, 01:22 PM

Good to hear that !

Just got 3 ! Thank a lot !

16th April 2008, 10:42 PM	#1025
Elkaid diyAudio Member Join Date: Jan 2003 Location: Canada	Excel Spreadsheet Hello everyone, I'm trying to get my hand on the excel spreadsheet found on Brian's website but it seems down along www.chipamp.com. If anyone has it near, it would be very appreciated Thank you !

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5th May 2007, 01:25 AM	#1021
jleaman Banned Join Date: Apr 2002	1) you would never even know if the cap was in backwards or not, it is extremely hard to know the difference in sound. 2) run 2/3 shielded wires from your input right to the board, depending if you are running balanced or line level. then run your 3 wires for your power right to the psu board. twisting / braiding really helps. 3) i can post pictures later on when i arrive hoe if you wish. I run 4 of these amps ( smd ) ones tho. Jase

5th May 2007, 02:00 AM	#1022
hayenc diyAudio Member Join Date: Apr 2005 Location: Glendale, AZ	I checked the silkscreen on the old and new boards I have. C1 is fixed on the new boards.

18th May 2007, 07:35 AM	#1024
gil-garcia diyAudio Member Join Date: Oct 2006	Hello, j'am,just starting to realize a 5 channel Mini A with PCB and PSU from chipamp. It is the most beautifull pcb j have never seen . One small problem, impossible to find in europe the small resistances. The project is : 2 transformers 300VA, 2x15V (one for front two channel and one for the others tree channel) 4 PSU board (2 for the front channel, 2 for the 3 others channel) As j am a beginner and as j have read a lot of thread with the impression that everybody do not speak always about the same schématic and references of resistors j am a bit lost. Can you help me Accordind to the part list from the site : R6 optional, for closer matching of Q1 and Q2 R12 : 750 initial value, could be optimized for expected power/load conditions R13 : 47.5K initial value, could be optimized for expected power/load conditions R17 : 100 initial value, could be optimized for expected power/load conditions j would like to have a bias about 1,3 with something like 18-20V with my 2X15V transformer. Could you tell me the values for R6, R12, R13 and R17. Do j have others componants to change the value. in this configuration, could you tell me what would be the best configuration in order to connect the psu board, which value for the res of the psu (pi filter), what kind of condensator and value at the end of the psu. If it is necessary, j have others psu boards in advance. Thanks a lot and excuse me for my poor english, j hope it is clear?

17th April 2008, 01:33 PM	#1027
ssmith diyAudio Member Join Date: Aug 2005 Location: Paris	here

17th April 2008, 07:28 PM	#1028
Elkaid diyAudio Member Join Date: Jan 2003 Location: Canada	Thanks a lot to both of you guys Have a nice day !

7th May 2008, 12:16 PM	#1029
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	FYI, I have more of black Aleph pcb sets, and put them back up on the website for $9 a pcb set. (set still includes 2 amp boards and 4 output device boards) Here is the parts list that I generated back in 05 when the first run of boards were made: http://www.chipamp.com/diyaudio/mini...parts_list.xls Let me know if you spot any issues, and I can correct it. I built a set of MiniA amps with the list, and had no issues. Here is a newer one that I found that has a bit more detail: http://www.chipamp.com/diyaudio/mini-A.xls -- Brian

7th May 2008, 01:22 PM	#1030
guitvinny diyAudio Member Join Date: Nov 2005 Location: Québec	Good to hear that ! Just got 3 ! Thank a lot !