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Old 6th November 2013, 07:35 AM   #51
bimo is offline bimo  Indonesia
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Many educated Indonesia person are not interested to design audio system. I do not know why. At university there are much digital electronic teaching rather than analog electronic.
People who love audio can modify audio system, even they do not know basic of electronic. The others follow who dare to modifying and believe their comments.
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Old 7th November 2013, 02:47 AM   #52
gootee is offline gootee  United States
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Quote:
Originally Posted by Nico Ras View Post
It is sad how rapidly cleverness overcomes rationaal. The amp is bridged and provided that the number of devices was selected for SOA and the power supply is capable then this configuration will provide 62Vrms into 4 ohm.

I do not know of anyone who listens to continuous single tone sine waves into pure resistors so 1000 watt rms is a figment of the imagination in any case.

One rather must assume that it is music they listen too driving speakers and the peak power delivered by the amplifier would most definitely reach 1000 watt into a nominal 8 ohms. Tom's maths shows it all, but neglected that it is necessary is to double the voltage swing in bridge mode.
Hi Nico! It's good to see you again!

Yes. Sorry. I did not notice or think about bridged configuration, for the calculations.
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Old 8th November 2013, 07:02 AM   #53
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by Nico Ras View Post
And what will be the voltage across the 220 ohm resistor. more or less than Vce SAT?
Yes, looks like it is operating safely because of 220 ohm resistors, and resulting smooth round clip also with this. Although the current may higher when clip, tip41/42 is to220 package and survive VAS overload current through 220ohm, and limited time to 470uF energy stock.

Last edited by ontoaba; 8th November 2013 at 07:07 AM.
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Old 8th November 2013, 08:31 AM   #54
ontoaba is offline ontoaba  Indonesia
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This one is the original schematic:
C945 inputs and Sanken OPS. That 220ohm VAS supply originally 820ohm and supplied with +/-42VDC. At the first launch, this amp is instantly famous but rather dissapear again.

http://www.diyaudio.com/forums/attac...-namec-btl.jpg

Last edited by ontoaba; 8th November 2013 at 08:47 AM.
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Old 8th November 2013, 08:55 AM   #55
AJT is offline AJT  Philippines
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Quote:
Originally Posted by ontoaba View Post
This one is the original schematic:
C945 inputs and Sanken OPS. That 220ohm VAS supply originally 820ohm and supplied with +/-42VDC. At the first launch, this amp is instantly famous but rather dissapear again.

http://www.diyaudio.com/forums/attac...-namec-btl.jpg
for the amplifier to produce 2500 watts, your power transformer should be a 5kva one, weighing in at least 30kg....assuming the output trannies can survive testing at that power level....
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Old 8th November 2013, 09:31 AM   #56
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by AJT View Post
for the amplifier to produce 2500 watts, your power transformer should be a 5kva one, weighing in at least 30kg....assuming the output trannies can survive testing at that power level....
The amp won't reach 1000W. It feels loud on bass, may be its low damping due to lack of ccurrent, increasing its loudness.
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Old 17th November 2013, 05:00 PM   #57
bedjons is offline bedjons  Indonesia
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Please kindly excused NAMEC's author..
LoL...
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Old 26th November 2013, 03:17 PM   #58
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Stand by and always reading,, with "new" account and new registration.. Okey,, one comment from us,, Rembang DIY_ers,, "and,, impossible to get one kilowaatt,, with simple driver,, very unstable to drive the finals,, and very very high risk without "super" driver and protector".. So,, to be continued.. Peace and nice brothers..
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Old 26th November 2013, 03:21 PM   #59
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Default Amazing..

Stand by and always reading,, with "new" account and new registration.. Okey,, one comment from us,, Rembang DIY_ers,, "and,, impossible to get one kilowaatt,, with simple driver,, very unstable to drive the finals,, and very very high risk without "super" driver and protector".. So,, to be continued.. Peace and nice brothers..
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Old 9th December 2013, 05:07 PM   #60
bimo is offline bimo  Indonesia
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In an Indonesia forum, many members desire to build high power of amplifier for PA's using. They want power full bass sound. They do not care about measurement. They do not care about sound quality. It is all about sound pressure of bass.
Many of them experienced about modifying audio circuit, but do not care about the theory of basic electronic.
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