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Chip Amps Amplifiers based on integrated circuits

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Old 10th November 2005, 05:29 AM   #11
digi01 is offline digi01  China
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here is the connections of buffer to amp.

P.S.
to Evilsizer,I have got a small enclosure from franz,will show the completed amp pic soon.

Zang
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Old 10th November 2005, 06:58 AM   #12
Franz G is offline Franz G  Switzerland
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I am waiting for a cad drawing from my supplier and an offer for ready prepared boxes.

As soon as I get the drawing, I will post it here.

On the other hand, it should be quite easy to build the own case out of two aluminium sheets.

Franz
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Old 10th November 2005, 11:10 AM   #13
wim is offline wim  Netherlands
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Zang, witch of the posted PSU schematics can be used? There are different types on the forum. I assume the one from Franz d.d. 6 oktober 2005 is de right one?

And why in the BOM 2 trafo's from 2x18 VAC?


Can we see pictures from a build PSU too?
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Old 11th November 2005, 10:27 AM   #14
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There seems to be an error in the silkscreen of the PSU board.

I suspect D1,D2,D3 to be printed the wrong way. I don't see this work as a proper bridge as it is drawn at the moment...
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Old 11th November 2005, 01:06 PM   #15
Nordic is offline Nordic  South Africa
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I still can't wait to get my hands on one of these, the only valve driven item I have is an old valve radio my grandfather build. Although I know the valve sound from band equipment like Fender bass amps etc... vely nice
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Old 12th November 2005, 12:30 PM   #16
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Got my boards today, they seem to be well done.

Maybe the holes for the tube socket could have been bigger. I had a hard time fitting mine into them.

Will inform of the progress.

Cheers

Andrea
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Old 12th November 2005, 01:36 PM   #17
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I used a drill to make the them slightly larger. There are more holes which weren't as expected. I had to bend the leads of my Elna duorex to make them fit the PSU board.
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Old 12th November 2005, 02:49 PM   #18
wim is offline wim  Netherlands
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I had the same problems, fitting the tubesocket on the PCB.

Hanzwillem, strange there is no comment on your post about the wrong PS PCB layout. I posted some other questions, but received also no answers.

Are Franz and Zang together on a lazy hollyday
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Old 13th November 2005, 08:38 AM   #19
Franz G is offline Franz G  Switzerland
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Sorry, I spend my weekend with my little daughter. Just in a hurry:

It seems in fact to be a mistake in the silk screen of the psu board. So, think about a correct bridge topology, before you solder the diodes!

I think, "my" schematic and the schematic from Zang are adequate. Two corrections: the filament voltage is +6.3VDC and ground (not -6.3VDC) and the 85VAC are too high to use with 63V electrolytics.

http://www.diyaudio.com/forums/showt...303#post753303

About the tranny:

You could use one, two or three trannies. Important is to have:

- 2 x 20VAC about 165VA (you are free to do your own gain calculation, depending on the available tranny as mentionned in the LM3875 datasheet)
- 6 to 8VAC 10VA (filament 6.3VDC and NE555/relay circuit)
- 35 to 45VAC 5VA min (anode voltage)

Franz

BTW:
Nice PSU simulation, to simulate the available trannies: Search for Duncans Amp Tools, PSU simulator. It is free.
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Old 13th November 2005, 09:35 AM   #20
wim is offline wim  Netherlands
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Thanks a lot for your answers Franz!
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