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Old 22nd September 2011, 09:13 PM   #131
vac231 is offline vac231  Switzerland
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Hi Dado,

My mistake for R25. This resistor is written R without number on schema dated 19.09.2011 01:37 PM, but shown in layout (dated 19.09.2011 02:05 PM.)

R28 is shown on layout, but without number (same layout).

You say invert Q10 and Q97, but they seem correct (same layout).

OK for warning. Thanks!

Nicola
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Old 29th September 2011, 07:21 AM   #132
dadod is offline dadod  Croatia
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Hi Nicola, any news? What did you do up to now?
Dado
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Old 29th September 2011, 06:57 PM   #133
vac231 is offline vac231  Switzerland
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Hi Dado,



I’ve located the main parts for the amp, but not for the power supply (capacitor models still under study). So order is still not completed.

What do you think of doubling the values, and replacing the 5W resistors with selfs for the PSU?

Nicola
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Old 29th September 2011, 08:14 PM   #134
dadod is offline dadod  Croatia
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Quote:
Originally Posted by vac231 View Post
Hi Dado,



Iíve located the main parts for the amp, but not for the power supply (capacitor models still under study). So order is still not completed.

What do you think of doubling the values, and replacing the 5W resistors with selfs for the PSU?

Nicola
You can double the capacitors value, but I think there is no need, specially if you do dual mono. I used Elna LP5 63V quite cheap but good. If you double the value you go in to inrush current area, and need to limit it.
"replacing the 5W resistors with selfs " sorry I don't understand what you whant to say.
Dado
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Old 30th September 2011, 01:08 AM   #135
vac231 is offline vac231  Switzerland
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Hi, Dado

Sorry, 'self' is the french word. I mean inductance. I read that some schemes have inductance at this place, with notably improved results.

For the capacitors, I'll try with your values first.

Thanks for Elna reference.

Nicola
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Old 30th September 2011, 06:37 AM   #136
dadod is offline dadod  Croatia
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Quote:
Originally Posted by vac231 View Post
Hi, Dado

Sorry, 'self' is the french word. I mean inductance. I read that some schemes have inductance at this place, with notably improved results.

For the capacitors, I'll try with your values first.

Thanks for Elna reference.

Nicola
Yes you can use an inductance, that should be even better. I did not try it as it should be as much mH as possible and could be cumbersome. You can increase the resistors too, but not to much as you loose voltage there and need more wattage.
Dado
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Old 30th September 2011, 07:40 AM   #137
dadod is offline dadod  Croatia
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Here is a suggestion to try something. The new schematic shows R24//C23 connected to the emitter of the Q95 instead to the collector of the Q9. This should render a bit lower distortion as will not load the VAS. I simulated it only, no listening was done.
Dado
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Old 30th September 2011, 10:32 AM   #138
AndrewT is offline AndrewT  Scotland
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There's a hint of Leach in that feedback.
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Old 30th September 2011, 11:00 AM   #139
dadod is offline dadod  Croatia
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Originally Posted by AndrewT View Post
There's a hint of Leach in that feedback.
This is actually manipulation with open loop bandwidth but traying to lessen disadvantages when this resistor was parallel to Miller compensation capacitor and in this case TMC.
Dado
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Old 4th October 2011, 12:01 AM   #140
vac231 is offline vac231  Switzerland
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Hi Dado,

1. Can I use 0.15 ohms for R30, R31, R93, R96 ?
2. Is there some component that I should sort ?

Nicola
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