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Old 4th May 2013, 11:14 AM   #1201
abetir is offline abetir  Philippines
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^Thanks!, I have etched the board i will be populating it soon... The objective is to create another compact board yet avoiding vertical mounting (especially the resistors).
I have found a Class D type heat sink (aluminum bar) which perfectly matches the space provided for it for the VAS. I just hope this new design will work smoothly...

Regards!
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Old 23rd May 2013, 12:27 AM   #1202
abetir is offline abetir  Philippines
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Here is the bottom copper for toner transfer etching for post #1199 lay-out,

TY!
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Old 5th June 2013, 09:31 PM   #1203
Flibble is offline Flibble  United Kingdom
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Default Thanks Elvee and abetir!

abetir - I etched and built your board up, layout is great and works perfectly! I built the board on very minimal budget with what I could find on ebay Q12/Q13 are 2SC2240, Q5/Q6 are 2SC3421, D3/D4 are 10SQ045. One minor issue is that the BD140s are getting very hot and I suspect they are fakes . The heatsinking in the pic is just for testing.

Cheers, Dan.
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Old 6th June 2013, 12:11 AM   #1204
abetir is offline abetir  Philippines
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Excellent Dan!

..pretty clean build from the looks of it the BD140s could have been fakes (not so sure though ), original phillips are gray in color and I guess they are becoming very hard to obtain. I see you are using metal cans for the output, also put a heatsink on VAS any small type (or DIY) should fit nicely on the space provided. I'm glad it works!
Just be sure to follow the power chart table.

Thank you Dan.
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Old 6th June 2013, 06:55 AM   #1205
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Flibble View Post
One minor issue is that the BD140s are getting very hot and I suspect they are fakes.
It is normal the BD140 become hot, they dissipate a significant quiescent power, and that is true whether they are fake or not.
Yours are certainly not original Philips, but that doesn't mean they are actually fakes: they could be from Telefunken, Siemens, ST, Motorola, etc
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♫♪ My little cheap Circlophone© ♫♪
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Old 2nd July 2013, 09:18 PM   #1206
Flibble is offline Flibble  United Kingdom
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Default Well chuffed...

abtir, Elvee - I think you were right about my original ST BD140s being genuine (I was suspicious of the very neat printing and shiny legs, in addition to the fact they were from China and very cheap ). I ended up replacing them for NOS scruffy grey Philips ones I found anyway. Thought you might like to see my finished boards, the BD140s are bolted to aluminium box section and the boards stand off. Still need boxing up (each assembly is one side!) but I'm listening to them now and I'm very happy

Quote:
Originally Posted by Elvee View Post
It is normal the BD140 become hot, they dissipate a significant quiescent power, and that is true whether they are fake or not.
Yours are certainly not original Philips, but that doesn't mean they are actually fakes: they could be from Telefunken, Siemens, ST, Motorola, etc
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Old 3rd July 2013, 10:20 AM   #1207
Elvee is offline Elvee  Belgium
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Nice build!
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. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪
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Old 6th July 2013, 02:29 AM   #1208
abetir is offline abetir  Philippines
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flibble, very nice heatsink works!
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Old 16th August 2013, 03:03 AM   #1209
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very good
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Old 7th November 2013, 08:09 AM   #1210
Elvee is offline Elvee  Belgium
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Here are some fresh news from the front:

Member Piersma has developped his own "deluxe" version of the Circlophone: it uses a cascoded jFET input stage amongst other improvements, and offers better overall performances at the cost of a manageable increase in complexity.

It still retains the basic Circlophone principles, meaning optimal sound quality without adjustments or thermal problems.

Sjerko has kindly sent me two boards for evaluation, and after some minor adjustments of the compensations, they work beautifully.

This version is therefore ready to be built and tested by others.

I'll let Sjerko himself present his work and material.
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♫♪ My little cheap Circlophone© ♫♪
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