My TH-600 300w fully balanced power amp - diyAudio
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Old 26th November 2014, 04:28 AM   #1
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Smile My TH-600 300w fully balanced power amp

Hi Folks,
This is my first share regarding the finished DIY power amplifier project, I spend almost a year(did not do it everyday) from being draw the first schematic to a paper then Protel for the simulation and the real test circuit.

This is my test to ensure that it can be the proven circuit.

Click the image to open in full size.


I called this mine the TH-600, below is about most interesting I want to share as video but just know now I could not insert embed youtube video here.
so please check this one TH-600 DIY power amplifier - YouTube
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Last edited by smithomo; 3rd December 2014 at 01:08 AM.
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Old 3rd December 2014, 01:06 AM   #2
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I added some more pictures here.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 3rd December 2014, 08:17 AM   #3
AndrewT is offline AndrewT  Scotland
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You apparently don't believe in twisted pairs.
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Old 4th December 2014, 02:21 PM   #4
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Quote:
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You apparently don't believe in twisted pairs.
Hi AndrewT,
What the wire you mentioned to be twisted?
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Last edited by smithomo; 4th December 2014 at 02:25 PM.
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Old 4th December 2014, 06:07 PM   #5
AndrewT is offline AndrewT  Scotland
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Every Flow and Return pair.

You could probably get away with leaving the bonded pairs since these are close coupled, provided the adjacent wires are Flow and Return of the same circuit.
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Last edited by AndrewT; 4th December 2014 at 06:10 PM.
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Old 4th December 2014, 06:29 PM   #6
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as that is a photo of the amp during assembly with no input or output wired I fail to see how you could come to that conclusion. If you watch the video, other than some bias to bling you can see that suitable cables were used.
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Old 7th December 2014, 01:19 PM   #7
The Dastardly Dad of Three
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Very nice congratulations.
Some descriptions here about your amplifier would be very nice to read.
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Old 7th December 2014, 06:27 PM   #8
SSassen is offline SSassen  Netherlands
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Looks nice, apart from the wiring that is, but Andrew hinted at that already.
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Old 7th December 2014, 07:12 PM   #9
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In home use with typical music programme or even short term/full power testing, full rating heatsinks may not be essential. However, mounting all the output devices to the top edge of the heatsinks is the least effective means of cooling - It decreases the heatsink efficiency and raises the temperature of the output devices significantly. The result means the safe, nominal amplifier power rating is now well below that which you may have assumed or calculated according to specifications.

If we assume 95% of the power capacity will be redundant in home use anyway, I guess de-rating a class AB amplifier's continuous power rating is not an issue but it does seem like a waste of good parts to build so big and only get maybe 60% of the apparent rating that we can assume you planned.

Fans will help significantly but won't be satisfactory to audiophile tastes. As this is clearly a commercial product, not DIY, by your presentation style, I think you will need to address this constructional aspect if you want the product to at least look convincing.
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Old 7th December 2014, 07:24 PM   #10
Gopher is offline Gopher  United Kingdom
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Think you used enough transformers there Butch? Seriously though, it's a tad overkill isn't it? Why do you need 300W anyway?

Last edited by Gopher; 7th December 2014 at 07:30 PM.
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