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Old 20th October 2013, 02:18 PM   #121
RCruz is offline RCruz  Switzerland
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Perfect, The LME 49710 can be fed with up to 36v...maybe I need and extra psu for that or a voltage divider.... what is the voltage you normally use for Vcc in this circuit ?
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Last edited by RCruz; 20th October 2013 at 02:26 PM.
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Old 20th October 2013, 03:28 PM   #122
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The circuit i build runs on only plus-minus 14V but i made a bridge with two amplifiers per channel.
I build it this way because Holger Barske wants to run this on solar panels.
The circuit is very tolerant on PSU voltage. Just make sure you do not kill the opamp.
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Old 20th October 2013, 03:30 PM   #123
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This one can be run on plus-minus 22 V :
http://www.ti.com/lit/ds/symlink/lme49870.pdf
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Old 20th October 2013, 06:15 PM   #124
RCruz is offline RCruz  Switzerland
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This one looks impressive.

As the ops will run in class B I guess I can be shy with the heatsinks.... What do you recommend as minimum ?

Just one final question.... what is C6 for ?
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Old 20th October 2013, 06:43 PM   #125
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This one should be sufficient, even for both channels :
SK 47/75/SA

Yes, this amp is pretty simple but it sounds very good. The way it is done gives a very honest sound. With more idle you can make the sound slightly warmer.
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Old 20th October 2013, 07:53 PM   #126
RCruz is offline RCruz  Switzerland
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C6 ?
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Old 20th October 2013, 08:00 PM   #127
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That is the classic Miller cap. It rolls of the open loop gain at 6dB octave.
Without it the closed loop amp would not be stable.
There are other ways like two pole compensation, TMC and similar that should have even less distortion but this solution here works well enough.
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Old 20th October 2013, 08:11 PM   #128
RCruz is offline RCruz  Switzerland
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This has been quite instructive.

I will now design the layout and post it here.

I must have all the parts in my stock 2SA1930 2SC5171 BC327 BC337 and the caps.... it will be a breeze
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Old 20th October 2013, 09:17 PM   #129
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I hope so. Mine worked right away.
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Old 20th October 2013, 10:53 PM   #130
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2SA1930 / 2SC5171 may be a little weak.
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