Good project... I hope it works well with your speakers.
It really made me smile when you wrote: "Roaming over flee market I bumped on smuggler who was selling a full box of various heatsinks for a funny price of 20 euro".
We need more smugglers!
It really made me smile when you wrote: "Roaming over flee market I bumped on smuggler who was selling a full box of various heatsinks for a funny price of 20 euro".
We need more smugglers!
Thanks for clarifying. I wrote about the orientation of the heatsink and about the solution with a cooler, but it seems that people rather look at images than reading text. Therefore, I was not clear what he wanted to say, since I had described the problem already.
Anyway, thanks for the comments, the amplifier really sounds well with ES209 speakers. I think I will keep it as is, all I will change is to make some order with wires which is a bit difficult, because that silver wire is indeed hard to shape.
I will post it all. All I am waiting for is a friend of mine who has Audio Precision equipment. I also need to get some free time. Surely the tests will be made - I am interested in it too.
Amplifiers designed by Bora sounds excelent
And for sure will measure very well too.... Bora's designs are guaranteed...his is not only and EE, his is PHD...has post graduation, an University teacher...of course will measure beautifull... the big miracle, is to join good electrical characteristics when measuring, nice dinamics results and excelent sonics, and his amplifiers shows this...i have assemble three of his amplifiers...all them lovely sonics.
Many of Bora designs can eat my amplifiers into the breakfast... smiling and without too much effort.
Very good work...nice amplifier.... the wooden panel result beautifull, i see your reasons for the heatskink position...and
you also has a lovely young girl into your home.
Tripple congratulations, the nice amplifier, the nice case with that beautifull wooden panel, and the young girl you have around to make your days more happy.
The small lady, daugther or even sister, will make your life better for your whole life.
Bora do not self promote himself.... he is calm in such a way, but despite his silence, because has not time to be here all time long reading, answering and giving follow up, he is , for sure, one of the best designers we have in our forum.
If you do not make modifications, following the schematic and parts list, constructing the board suggested, his amplifiers will behave as plug and play.... without any problems...of course, if you change a lot of things and produce many construction errors you will face problems, with Bora amplifiers or with other amplifiers too.
You can see the amplifier quality, the thermal track has to be perfect...the beautifull enclosure has not too much ventilation holes, the heatsinks are out from normal, standard, convection position, will introduce resistance to heat transference to the air..and even this way working fine.... so... thermal tracking is holding the big job to control... and this is very good.
You see..also the heatsinks are not big enougth.... very nice amplifier...very nice...pretty case...beautifull wood.
regards,
Carlos
And for sure will measure very well too.... Bora's designs are guaranteed...his is not only and EE, his is PHD...has post graduation, an University teacher...of course will measure beautifull... the big miracle, is to join good electrical characteristics when measuring, nice dinamics results and excelent sonics, and his amplifiers shows this...i have assemble three of his amplifiers...all them lovely sonics.
Many of Bora designs can eat my amplifiers into the breakfast... smiling and without too much effort.
Very good work...nice amplifier.... the wooden panel result beautifull, i see your reasons for the heatskink position...and
you also has a lovely young girl into your home.
Tripple congratulations, the nice amplifier, the nice case with that beautifull wooden panel, and the young girl you have around to make your days more happy.
The small lady, daugther or even sister, will make your life better for your whole life.
Bora do not self promote himself.... he is calm in such a way, but despite his silence, because has not time to be here all time long reading, answering and giving follow up, he is , for sure, one of the best designers we have in our forum.
If you do not make modifications, following the schematic and parts list, constructing the board suggested, his amplifiers will behave as plug and play.... without any problems...of course, if you change a lot of things and produce many construction errors you will face problems, with Bora amplifiers or with other amplifiers too.
You can see the amplifier quality, the thermal track has to be perfect...the beautifull enclosure has not too much ventilation holes, the heatsinks are out from normal, standard, convection position, will introduce resistance to heat transference to the air..and even this way working fine.... so... thermal tracking is holding the big job to control... and this is very good.
You see..also the heatsinks are not big enougth.... very nice amplifier...very nice...pretty case...beautifull wood.
regards,
Carlos
I had some extra time today to play with the amplifier. I attached sound card from PC (AC97) and I generated a square wave in Sound forge 8.0. The frequency of the wave is 1kHz. I was amazed how bad was the output from the sound card. 
Anyway, this is what I saw on oscilloscope. The blue line (CH2) is the output from sound card, the yellow line (CH1) is the output from the Studio amp. The load on the amp was a 10 Ohm wire resistor (5W). Oscilloscope used is Tektronix TDS2012.
I will do real tests as soon as Audio Precision equipment becomes available (a friend is busy with it right now). I promise, I will not play with sound card anymore.
Anyway, this is what I saw on oscilloscope. The blue line (CH2) is the output from sound card, the yellow line (CH1) is the output from the Studio amp. The load on the amp was a 10 Ohm wire resistor (5W). Oscilloscope used is Tektronix TDS2012.
I will do real tests as soon as Audio Precision equipment becomes available (a friend is busy with it right now). I promise, I will not play with sound card anymore.
Attachments
I'm just curious... I see in the speaker photo you are using braided multi-conductor speaker cables. I understand using these style cables provides a fairly capacitive load to the amplifier. Am I mistaken about this?
Thanks,
..Todd
Thanks,
..Todd
Theoretically, yes. Those cables are characterized by low inductance and high capacitance. However, there are claims that it is completely the opposite, that the capacitance is very small.
I made my cables out of Belden CAT5 ethernet cable with teflon insulation. It is considered to be pretty good for speaker cables. I personally have not made any capacitance measurements. I just plugged the cables into jacks and all worked fine. I, therefore, never bothered to measure the parameters. There are warnings about the high capacitance. It is usually said that old amplifiers have problems with capacitive loads. I just never understood what they mean by "old"- old design, or aging, old amp...
Anyway, more info about the cables can be found here:
http://www.venhaus1.com/diycatfivecables.html
http://www.tnt-audio.com/clinica/cat5questions_e.html
The first link was actually the one I had followed while I worked on my cables. The second link gives more technical parameters.
What I can say from my experience with these cables is that they are completely transparent. I compared them to low-budget Oelbach which added a lot of color to sound. I therefore, kept CAT5 as a satisfactory solution for my setup.
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