dac I/V convertion with very low distortion - Page 70 - diyAudio
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Old 22nd November 2012, 10:00 AM   #691
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Cool.
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Old 22nd November 2012, 10:53 AM   #692
smms73 is offline smms73  Portugal
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3D images of the board , but i have to do some modifications , change some traces from bottom to top to have a wider ground superficie in bottom, and add some connectors to input output and power, hope i have time this night to finish it.
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Old 22nd November 2012, 11:08 AM   #693
MiiB is online now MiiB  Denmark
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what is the purpose of the second opamp...?? phase-inversion..??

you can make a second pole by splitting the servo input-resistor in two and then have a cap to gnd in between.
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Old 22nd November 2012, 12:09 PM   #694
smms73 is offline smms73  Portugal
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Yes MiiB, phase inversion. Is better to have the second pole in the output of servo to filter the noise of opamp.

I must say that is not a good idea to use this type of servo in a feedback loop of a power amplifier, but in a open loop circuit like this is oK.
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Old 22nd November 2012, 10:11 PM   #695
RollE2k is offline RollE2k  Sweden
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PCB is for stereo channel single ended?
If you do a PCB for ESS9018 will it be balanced?
also, what is the approx power draw for this circuit (as it is right now)?
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Old 23rd November 2012, 05:45 AM   #696
Shinja is offline Shinja  Japan
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smms,
It seems you can route more wires on components side, not to devide ground plane.

the circuit conveys input current to output, and the current flows to ground through the IV resistor and paralleled capacitor, so it may be some benefit to separate ground return pass and ground plane.
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Old 23rd November 2012, 12:39 PM   #697
smms73 is offline smms73  Portugal
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Yes Shinja, I have already changed some traces to the top side as i said in post #692.
I have take attention to the ground currents paths and the inductance of ground , important is to get the currents of the rail capacitors away from the path of the signal, there is no need to separate the ground.
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Last edited by smms73; 23rd November 2012 at 12:47 PM.
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Old 23rd November 2012, 12:42 PM   #698
smms73 is offline smms73  Portugal
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RollE2k one pcb per channel , for stereo need 2 for balanced is 4 boards.
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Old 23rd November 2012, 01:44 PM   #699
Shinja is offline Shinja  Japan
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excuse me smms.
I took too much attention to the picture,so I did not read your post fully.
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Old 23rd November 2012, 04:05 PM   #700
smms73 is offline smms73  Portugal
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Im not that good to express myself, especially in English :-)

I will separate the ground return of the rail capacitors from the rest of the ground .
This weekend will be the audioshow in Lisbon so I will not have much time left , but I hope next week to have 2 prototype board made.l am very curious to listening the final results of all of this.
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