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Old 20th December 2011, 03:23 PM   #371
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ELVEE:

Thanks for your patience in getting all of us this far with this amp!

Some additional info :

The board was designed to fit a DIN standard card-frame, size 100x160mm, the assembly is 1.8" wide
I will post schematics and layout info soon
All parts used are through-hole and standard, off-the shelf

If there is enough interest in a group-buy I see following parts included in the package:
2 pc boards (amp & back-plane), heatsinks (4 pcs.) and a programmed uP for the fan

E
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Old 20th December 2011, 05:26 PM   #372
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by mickeymoose View Post
Thanks for your patience in getting all of us this far with this amp!
Thank YOU for your dedication!

Here are some more pics of the "innards" (always the prototype of the beta version):
Attached Images
File Type: jpg 100_5128.JPG (257.0 KB, 855 views)
File Type: jpg 100_5131.JPG (357.3 KB, 3877 views)
File Type: jpg 100_5129.JPG (293.6 KB, 728 views)
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♫♪ My little cheap Circlophone© ♫♪

Last edited by Elvee; 20th December 2011 at 05:28 PM.
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Old 21st December 2011, 01:56 AM   #373
gannaji is offline gannaji  India
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mickeymoose:
Please count me for one full stereo set!
gannaji
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Old 21st December 2011, 07:57 AM   #374
harrydg is offline harrydg  Belgium
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depending on the price: check!

ps. Elvee, greetings from Etterbeek!
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Old 21st December 2011, 09:17 PM   #375
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The cost of the "kit" depends on what you expect. The easiest for me (and cheapest for you) is just the boards and pre-cut heatsink parts (drill your own holes), it is diy audio, after all. The code for the fan controller will be available (not yet written, any one willing to do that?)
Cheers, and lots of presents to all! E
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Old 21st December 2011, 10:19 PM   #376
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Mickeymoose, what outputs are you using?
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Old 21st December 2011, 11:42 PM   #377
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o...414: I did not change elvee's circuit at all. I used TIP3055 (instead of 2N3055) to acomodate the mechanical constraints. E
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Old 22nd December 2011, 07:16 AM   #378
harrydg is offline harrydg  Belgium
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for me it's all the same actually.
I'm getting some symasym boards in a few days and that will be my first. So i dont have any experience in all the diy stuff. So I'll have to buy a hole-maker and all, but hey... i'm gonna need it anyway, so i don't care!

ps. isn't it "safer/easier" do use transistors to drive the fans instead of a micro controller? something like this, but with a thermistor or so to regulate:
Simple Linear Fan Controller
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Old 30th December 2011, 05:13 PM   #379
heinz is offline heinz  Germany
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Hi,

i made a circlophone based on powerfluxes pcb (see the attached picture). I did use the transistors originaly proposed in the schematic. Voltage ist +-25V.
Power draw (no signal) from Transformator is approx. 10W.
First impression (using cheap speakers): Good bass and mids.
The only problem i am experiencing: The driver Transistors and 2n3019 are getting too hot to touch. Did anybody else a build usind the tight packed powerflux pcb? Is there a clever way to use a heatsink on the to-39 package?
Thank you.
Attached Images
File Type: jpg picture.jpg (115.6 KB, 575 views)
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Old 30th December 2011, 05:31 PM   #380
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Quote:
Originally Posted by heinz View Post
Hi,

i made a circlophone based on powerfluxes pcb (see the attached picture). I did use the transistors originaly proposed in the schematic. Voltage ist +-25V.
Power draw (no signal) from Transformator is approx. 10W.
First impression (using cheap speakers): Good bass and mids.
The only problem i am experiencing: The driver Transistors and 2n3019 are getting too hot to touch. Did anybody else a build usind the tight packed powerflux pcb? Is there a clever way to use a heatsink on the to-39 package?
Thank you.

i've made a mistake: 15R and 56R on bottom BD are reversed on silkscreen. this has been noted before but here i've uploaded a corrected PDF-document.
Other improvements are more space for cooling for the BD's. if one doesn't use the jumper, or solders one on the bottom, one can use a flat standing piece of aluminum across the PCB for both BD's together. but do remember to use isolation (mica or silicone)

i call this V2.0, and the power transistors are TO-264
Attached Files
File Type: pdf Circlophone v2.0.pdf (119.7 KB, 378 views)

Last edited by powerflux; 30th December 2011 at 05:34 PM.
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