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Old 31st May 2012, 06:42 AM   #651
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Hi Sir APEX can you share SR400 schematic please?
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Old 31st May 2012, 09:24 AM   #652
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Hi! Mile

Alex used 4 bc560c where as in sr200 schematic only 3 bc560c are present

why an additional transistor was used ??
Go to post #32.
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Old 31st May 2012, 09:25 AM   #653
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Originally Posted by leonatax View Post
Hi Sir APEX can you share SR400 schematic please?
Regards.
SR400 is SR200TEF
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Old 31st May 2012, 07:18 PM   #654
shreya is offline shreya  India
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Mile

Can I connect input ground to power supply ground directly or I must use 10ohms resistor?
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Old 31st May 2012, 10:28 PM   #655
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Mile

Can I connect input ground to power supply ground directly or I must use 10ohms resistor?
You can connect directly, 10ohms resistor you can add anytime if there is hum or noise.
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Old 8th June 2012, 04:56 PM   #656
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Hi all,
I create new layout again, because I can't start make any PCB etched yet.
I hope this is the best I can do, new size is 205 mm x 68 mm
I make it wider so there is enough space between output transistor so the heat can be spread quickly
One more thing is there really good deal if I change the all 2.2uF/100V to the higher value,
I only have 10uF/100V, if bigger is good deal I will change it again

Regards
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Last edited by JOHN BALI; 8th June 2012 at 05:06 PM.
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Old 8th June 2012, 05:35 PM   #657
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Quote:
Originally Posted by JOHN BALI View Post
Hi all,
I create new layout again, because I can't start make any PCB etched yet.
I hope this is the best I can do, new size is 205 mm x 68 mm
I make it wider so there is enough space between output transistor so the heat can be spread quickly
One more thing is there really good deal if I change the all 2.2uF/100V to the higher value,
I only have 10uF/100V, if bigger is good deal I will change it again

Regards
Good Job Mr. Jhon.
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Old 9th June 2012, 10:56 AM   #658
AndrewT is offline AndrewT  Scotland
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Nice layout.
But, is it worth squeezing the PCB down to 205 by 45?

That would allow 2 PCBs on a single 205 by 90 board to save costs.
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Old 9th June 2012, 03:41 PM   #659
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That can be done, but I like this board
There are space on three TO-126 for the heatsink of course.
I can't find 3D model for heatsink
For the input caps also enough space for playing with caps
205 because I bought 205 x 205 board size
divide by 3 = 205 x 68 mm.
I will try it but only one thing...
Do you think larger caps on boards says 470uF will bring much improvement?
If we have enough caps on the main PSU
worth?

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Old 9th June 2012, 04:04 PM   #660
AndrewT is offline AndrewT  Scotland
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470uF for what? Local medium frequency decoupling? Then 470uF is probably sufficient, most amplifier get away with 100uF for the MF decoupling.
Have you got HF decoupling? Is it in the correct place, or places?
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