SymAsym - "The Sequel", AAK's PCB Builders Thread - Page 11 - diyAudio
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Old 7th February 2010, 09:03 PM   #101
sng001 is offline sng001  Australia
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lgreen,

I used Mouser part no. 576-01000054N for my SymAsym boards and I picked this Littelfuse model because it is silver-plated. I believed that 576-01000054N is out of stock at Mouser but the part number 576-01000054H should have the same dimensions.

- Stanley
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Old 8th February 2010, 12:26 PM   #102
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Hi Al,

I have a box of some generic red, green and yellow LEDs. Can I use these or should I stick to the particluar make you have specified in the BOM?

cheers

Aidan
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Old 8th February 2010, 01:27 PM   #103
AAK is offline AAK  United States
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Hi Aidan,

Do you know the LEDs forward voltage? If your not sure connect the LEDs cathode to about a 5k resistor and then a 12V supply and measure the voltage from the cathode to ground. If the voltage measures around 1.75V to 1.85V they should work fine. If not you may have to adjust the front end bias resistor R19 to compensate.

Regards,

Al
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Old 12th February 2010, 05:52 PM   #104
AAK is offline AAK  United States
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Boy it's been awfully quiet out here this week. Stanley (sng001) was the first out of the gate that I know of, how are the rest of you doing with the amp assembly?

Regards,

Al
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Old 12th February 2010, 06:12 PM   #105
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Not that I'm working at the Amp at the moment, but I'm here to support you, Al
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Old 12th February 2010, 06:37 PM   #106
AAK is offline AAK  United States
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Thanks, I need all the support I can get.
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Old 12th February 2010, 06:52 PM   #107
AAK is offline AAK  United States
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Hi All

I just finished a low power version of my DTV Rev_1.3 PCB with the same amplifier circuit but with only a single OT pair and no on-board PS. The PCB measures only 2.5" (63.5mm) x 2.95"(75mm) which is perfect for a home theater amp using an external PS. The PCB provides provisions in the OT section to accept Lateral Mosfets for an all input/output fet operation.

Attached is a picture of the PCB and schematic. Since this is a low power version I dropped the rails to +/-36V and bypassed the differential/VAS cascodes. From my testing bypassing the VAS cascode increases 2HD resulting in a softer sweeter sounding amplifier.

Al
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File Type: gif STS50_Sch.gif (26.6 KB, 561 views)
File Type: gif STS50_PCB.gif (47.3 KB, 555 views)
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Old 12th February 2010, 06:59 PM   #108
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Need time to take appart budget to acheave mouser purchase for three DTV.....

Marc
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Old 12th February 2010, 07:03 PM   #109
AAK is offline AAK  United States
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Hi Marc,

I guess you gotta do what you gotta do. Waiting patiently...

Regards,

Al
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Last edited by AAK; 12th February 2010 at 07:16 PM.
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Old 12th February 2010, 07:18 PM   #110
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During i'am working on amp layout. I drawn a PSU board to use MBR20_200CT i have on hand (25 unit). That will just nice for three psu board with double rectifier bridge.

Click the image to open in full size.

Click the image to open in full size.

I will screw MBR on main heatsink, they will be solder under PCB board, same way as OUTPUT transistor on main amp board.

Marc

Last edited by Idefixes; 12th February 2010 at 07:21 PM.
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