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Old 21st May 2008, 11:02 PM   #51
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Thanks guys, I'll cover the power supply tomorrow
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Old 22nd May 2008, 10:11 AM   #52
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quick question, seeing the powersupply, PG+ and PG- should be connected together as the electronic common ground?
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Old 22nd May 2008, 10:19 AM   #53
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PG+ & PG- are already connected by a PCB trace.
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Old 22nd May 2008, 10:40 AM   #54
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@Andrew,

thanks, yes i see the PCB trace it is connected. this is look almost like the PSU i mentioned on my other thread, the difference is this PSU only use 1 transformer with 2x25v secondary rail, and use 2xDiode rectifier. Could this also be implemented with 2 transformer?
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Old 22nd May 2008, 11:39 AM   #55
AndrewT is offline AndrewT  Scotland
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yes, one transformer secondary to each PSU input pair.

That's the beauty of twin secondary windings, they are isolated from each other. Separating the transformers simply follows the same isolation. Unfortunately twin transformers also increases the regulation unless you choose very large transformers which have lower regulation.
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Old 22nd May 2008, 11:54 PM   #56
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I believe i have post this question on other thread, but I want to know about single or split supply, what are the benefits?

can someone point to me where to read about this? I have a TDA2050 amp, powered with a single supply of +18.5volts, speaker load is 8ohm.
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Old 23rd May 2008, 12:16 AM   #57
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Quote:
Originally posted by casiomax
I believe i have post this question on other thread, but I want to know about single or split supply, what are the benefits?
The explanation can be found on 47Labs site: http://sakurasystems.com/faq.html


Q. What kind of improvement do we get by adding an extra power supply?
A. By adding another power supply, you make it into a complete mono structure. It also adds more power (does not double though) and current capacity. The result is an airier, deeper soundstage and more authotity through the entire frequency range.
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Old 23rd May 2008, 12:49 AM   #58
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This is my test setup, where I'll show how to wire transformer and power supply.
Please note that this is for demonstration purpose only, so you don't see a proper metal chassis.
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File Type: jpg setup.jpg (99.0 KB, 10638 views)
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Old 23rd May 2008, 12:55 AM   #59
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Lets start with a transformer. I use Plitron 300VA, 2 x 22V AC in all my amps, both stereo and dual mono. It is is approx $100 for a single unit. Getting similar Avel transformer from Partsexpress will cost you $50/pc.

If I order custom transformers, I prefer secondary at the core with wire diameter 1.8mm (for 300VA unit). I tested some amorphous core custom transformers and they sounded marginally better than standard core.
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File Type: jpg transformer.jpg (87.4 KB, 9847 views)
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Old 23rd May 2008, 01:00 AM   #60
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If your transformer comes with a standard mounting hardware, that's what you use.

Plitrons are epoxy filled and hardware is not included. I increase the hole to 3/8" size and install ancor nut with a matching screw, available from Home Depot. The screw hole size, in a bottom of a chassis, is 1/4".
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