SymAsym - "The Sequel", AAK's PCB Builders Thread - Page 3 - diyAudio
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Old 21st January 2010, 12:24 PM   #21
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Hi Andrew,

I updated the PCB with an extra pad for C7 and C8 with a 10mm spacing. I didn't think it would be such a problem.

Your idea would work fine, but be careful not to drill through the top side trace that connects to ground. The trace comes pretty close to where the drill hole would need to be for a 10mm spacing.

Regards

Al
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Old 21st January 2010, 04:34 PM   #22
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Boards have landed in the UK.

Many thanks Al, they look great.

cheers

Aidan

PS Do Q22/24 and Q23/25 need matching?

Last edited by chalkandtalk; 21st January 2010 at 04:40 PM.
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Old 21st January 2010, 05:13 PM   #23
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Hi Aidan,

Great to hear the boards and parts arrived.

You should match Q22 with Q23, and Q24 and Q25 to closely distribute the power between each pair. I've not tried using an unmatched pair so I can't say for sure how well it would work. You can also use a single pair until you find a matched pair.

Regards,

Al
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Old 21st January 2010, 07:57 PM   #24
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Hi All

I've added testing procedures to the attached assembly instructions document found in post #1.

Remember if your using the 2SK170s for Q1&Q2 to insert them in the opposite direction then how it's labeled on the board. The flat side of Jfets Q1&Q2 should face inward towards the large PS caps.

I've added a couple pics that should help with the testing.

Regards,

Al
Attached Images
File Type: jpg CIMG1238.JPG (283.2 KB, 769 views)
File Type: jpg CIMG1250.JPG (321.3 KB, 740 views)
Attached Files
File Type: pdf Assembly_Instr.pdf (16.5 KB, 127 views)
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Old 21st January 2010, 10:11 PM   #25
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In post #23 I meant match Q22/Q24, Q23/Q25. Geez...

Al
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Old 22nd January 2010, 06:51 AM   #26
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Hi Al, could post a picture with physical layout (parts placement and name) it's just more easy to work with since their is a lot of parts with little space...

Marc
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Old 22nd January 2010, 01:11 PM   #27
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Hi Marc,

Attached is the parts placement diagram.

Regards,

Al
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Old 22nd January 2010, 01:40 PM   #28
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Thanks AL.

Marc
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Old 22nd January 2010, 07:38 PM   #29
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Hi All,

For the 6.8V zener diode ZD3 insert the lead thatís nearest to the black band (cathode) into the pad with a circle labeled around it.

I've attached the latest assembly instructions with the above instruction added.

Regards,

Al
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Old 22nd January 2010, 07:52 PM   #30
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Hi Al, Some picture of "sensible orientation part" would be top to avoid mistake espacialy for non english foreigner as me.

Marc
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