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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 20 Jan 2021, 18:26

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PostPosted: 19 Nov 2020, 18:11 
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Joined: 14 Jul 2018, 00:14
Posts: 1
Are there Gerber files for this project that can be uploaded to a company like PCBway to have boards made?

Thank you,

David.


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PostPosted: 09 Jan 2021, 19:54 
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Joined: 09 Jan 2021, 19:14
Posts: 2
tombethe wrote:
Hej Olof ;-)

I'm glad to read that you enjoy your project and i must say, that you've done it very good! It's not very easy to build a amp just "from the scratch" as first time project. Great!

You can use the 22uF / 25V cap instead of the 35V cap. That shouldn't be a big problem, because this cap isn't connected to the supply voltage. This cap is a decoupler for the feedback and it also works as a frequency setting component. You can attach it to the circuit and change it later to 22uF / 35V - when you got this cap. I would change it later, if you want to drive the amp to the limit (for safety reasons only).

Some more little tips:
Be sure that the leads from the PSU to the amp are able to carry the current. Use 1,5 mm² wires to supply the amp boards.
You must be careful with the IC isolation. Be sure that the IC doesn't have a electric contact to the coolers. Use MICA or Silipads + thermal grease.
If you like to build the completed amp into an enclosure, be sure that it's vented, or the amp will heat up.
Connect the "MAINS EARTH" to the enclosure, if you want to use a metal enclosure.

Feel free to ask, if there any questions are left!


Where to apply the paste thermally? is it on the metal back of the IC or on the heatsink surface too?


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PostPosted: 09 Jan 2021, 22:00 
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Joined: 09 Jan 2021, 19:14
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Hello. Introduce I'm still new here. I am interested in the discussion in this post. But what I still don't understand. Can a 3A 18v CT transformer be used for this stereo amplifier?


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PostPosted: 10 Jan 2021, 20:42 
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Joined: 28 Dec 2010, 22:07
Posts: 353
rian wrote:
Hello. Introduce I'm still new here. I am interested in the discussion in this post. But what I still don't understand. Can a 3A 18v CT transformer be used for this stereo amplifier?


Sure. 18v rectifies to around 24v. Split the supply for +/- 12v and run two channels. You could easily get 5wpc into 8 ohm speakers. The power into 4 ohm speakers might not be as good but you'd have to try and see.

Ed

_________________

You can't have too much heat sink.


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