Building Elvee's Circlophone: Documentation, Parts, Accessories, & beginner friendly - Page 27 - diyAudio
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Old 1st May 2013, 11:38 PM   #261
abetir is offline abetir  Philippines
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Quote:
Originally Posted by Project16 View Post
Hello everyone!
Apparently these transistors may agree (well I think)!
NTE128:
http://www.nteinc.com/specs/100to199/pdf/nte128.pdf
2N3053:
http://www.centralsemi.com/PDFs/products/2n3053.pdf

Regards!
2N3053 is a no no! I have tried them before, they heat up tremendously!,
even at low power.

TY!
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Old 4th May 2013, 03:38 PM   #262
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Default My approach on plain Circlophone

Hello all,

I want to share my plain Circlophone layout tryout. I tried hard for this time. It's output transistor and driver arrangement based on Dx amp (by Carlos). I thought that such kind of layout is best to use TO3 metal case output transistors. Still can be easily converted to plastic case only layout but this is not the main purpose.

Any opinion appreciated.
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File Type: jpg CIRCLOPHONE-PLAIN.jpg (101.9 KB, 411 views)
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Old 8th May 2013, 07:37 AM   #263
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Default My pcb status

I think I'm close to final but not sure. Grounding scheme is in question. Due to different requirements of TO3 metal transistor construction, I decided to offer plastic transistor version separately. Bord size is 100*60 mm even with those fuses and bigger bypass capacitors.

This time I have spend a time for presentation..
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File Type: jpg circlophone-pcb-extra.jpg (97.4 KB, 371 views)

Last edited by terranigma; 8th May 2013 at 07:43 AM.
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Old 14th May 2013, 09:18 AM   #264
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I think it is getting better. I faded a bit the component layer for easy following the traces.
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File Type: jpg circlophone-pcb-beta.jpg (91.7 KB, 338 views)
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Old 14th May 2013, 09:49 AM   #265
jerryo is offline jerryo  Isle of Man
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Hi terranigma,
I know nothing about pcb layout but can I ask why there are parallel ground traces running next to each other between input and "ground out" ?
I like your pcb so it might be the first pcb that I try to etch myself! What are the exact dimensions?
Cheers
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Old 14th May 2013, 11:19 AM   #266
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Quote:
Originally Posted by jerryo View Post
Hi terranigma,
I know nothing about pcb layout but can I ask why there are parallel ground traces running next to each other between input and "ground out" ?
I like your pcb so it might be the first pcb that I try to etch myself! What are the exact dimensions?
Cheers
Hi jerryo,

In current revision, I merged the input ground track (the one you mentioned I think) in to the main track. At first, i supposed to establish a star ground effect but later decided to avoid it due to short track length. There is going to be 2 different boards but same layout. One is metal transistor and plastic transistor version which is 10*9cm, other one is only plastic transistor version which is 10*6cm.

Regards.
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Old 21st May 2013, 07:28 PM   #267
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Default Final versions so far..

Hello All,

I think that my layout is ready for an actual build, though haven't build one yet.

I have exported two versions with same layout. Hybrid (Metal + plastic) version is constructed best with L-shaped aluminum profile. Suggested minimum profile size is 40x40x6 mm. Board sizes are 100x90mm and 100x60mm respectively.

Hope they will be useful for prospective builders of this extraordinary amp.

Regards.
Attached Images
File Type: jpg circlophone-pcb-v1.jpg (201.6 KB, 298 views)
File Type: jpg circlophone-pcb-plastic-v1.jpg (169.3 KB, 308 views)
Attached Files
File Type: pdf CIRCLOPHONE-PLAIN-METAL-V1.pdf (77.6 KB, 38 views)
File Type: pdf CIRCLOPHONE-PLAIN-PLASTIC-V1.pdf (122.1 KB, 47 views)

Last edited by terranigma; 21st May 2013 at 07:32 PM.
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Old 5th August 2013, 12:10 AM   #268
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Apparently, the information superhighway is clear full of pot-holes covered by band-aids.
And we needed some more band-aids.
A recent forum update broke most of the store-search type ebay links in post#1. After the forum update (to ebay rover), it quit finding parts from reliable vendors.
That had to be fixed!
So, as a repair, I have written a huge number of html redirectors and posted them to startfetch.com (my handmade, homepage project, which has superior safety due to the absence of trackers). Next, I sent the problem links to the redirectors. All of the links work now. The parts finding function has been restored to post#1.
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Old 6th August 2013, 04:41 PM   #269
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Hello Daniel,

On pcb list section at first page, I see you decide to link pcb files directly rather than the related post that contains some extra information. Isn't it more useful and easy to use specific post link?

Regards.
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Old 7th August 2013, 12:28 PM   #270
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Quote:
Originally Posted by terranigma View Post
Hello Daniel, On pcb list section at first page, I see you decide to link pcb files directly rather than the related post that contains some extra information. Isn't it more useful and easy to use specific post link? Regards.
Links to posts within the same thread don't work reliably in all conditions (except that links direct to attachments always work). They're working on the problem; however, functionality tends to come and go. So that's the problem. Here are three possible solutions:
1).
I can link to posts in Other threads, such as the ♫♪ My little cheap Circlophone© ♫♪ so, "the other thread" is a great spot for technical materials, directions and expansive information. This is how we started and the functionality has been reliable.
2).
If you PM me with a specific need, I can write redirectors to serve up a "boomerang" function, first to startfetch.com and then right back here to the correct post within the same thread. The lease is paid up on startfetch for the next 4-1/2 years, so the functionality should work for at least that long and probably much longer.
3).
You can put relevant materials AND a text file within one zip file and attach the collection anywhere you like and I can link to that from anywhere. The user of this will receive the zip file collection along with the text file that contains what you'd like to say about it.
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