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Old 31st March 2013, 12:56 AM   #1951
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What I wanted to ask:

I noticed the output offset drift is (after probably 24-48 hours running) quite high, up to several 100's mV's. After I placed a cardboard box over the pcb's the drift went down to probably usually +-25mV with peaks to 100mV.

1. I see people reporting output offset drift of 5mV. Was that measured using a DMM or a scope? When using the DMM, my pcb's show quite low drift (range towards 5mV, however using a scope gives the full picture as mentioned above.).

2. So the Paradise is very sensitive to thermal fluctuations (I have an aircon on the other side of the room and switching it off makes a huge difference already). This placed quite strict requirements on the enclosure for the Paradise. Air vents are probably a bad idea and heatsinks outside the enclosure a good one. Also thermal coupling of certain devices (or the whole thing) is a good idea. Anyone care to comment on how they achieved this?

3. I am obviously still waiting for the caps leakage to settle down. I am using the caps provided in the parts GB (panasonic apparently.) Would using different caps bring any improvement, either sonically or in the offset drift?

thanks
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Old 31st March 2013, 01:19 AM   #1952
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Quote:
Originally Posted by studiostevus View Post
2. So the Paradise is very sensitive to thermal fluctuations (I have an aircon on the other side of the room and switching it off makes a huge difference already). This placed quite strict requirements on the enclosure for the Paradise. Air vents are probably a bad idea and heatsinks outside the enclosure a good one. Also thermal coupling of certain devices (or the whole thing) is a good idea. Anyone care to comment on how they achieved this?

3. I am obviously still waiting for the caps leakage to settle down. I am using the caps provided in the parts GB (panasonic apparently.) Would using different caps bring any improvement, either sonically or in the offset drift?

thanks
2.1 Fully enclosed box with extra fins extentions to take the heat out See My Paradise.

2.2 Heat sink outside box it is realy a good idea

2.3 This came up but was not discuseed in depth IMO and it is worth same time and efort.

3 I TOLD YOU TO RUN IN THE CAPACITORS WHIT SIMPLE LM317
Nah only joking shouting just bit of fun do as you like but suggestion was there.
I wuld say try the Paradise with standard components, it takes a bit of listening to apreciate the honesty of this stage, then feel free to make changes to suit your ears and system.

For imput caps Pana FC are prety good same wuld argue that Pana FM sound better
AS I understand low leachagge current is the main parameter of interest in the input stage and if this is the case Hi voltagge rating for same Capacitance Value may present same improvment.
But I can not see any real issue on the R2 boards

PS You got PM
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Old 1st April 2013, 09:24 AM   #1953
hesener is offline hesener  Germany
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Quote:
Originally Posted by Benedetto View Post

Here we are:
Click the image to open in full size.
...almost,
Karfreitag will proof...
beautiful, great layout!
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Old 1st April 2013, 09:29 AM   #1954
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Thanxalot Alfred.
And it's still rising...
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Old 1st April 2013, 11:25 AM   #1955
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Quote:
Originally Posted by studiostevus View Post

1. I see people reporting output offset drift of 5mV.
Paradise Builders

Did you change the resistor values as described in JJ's post? This effectively cures the offset problem and together with a power-on/off mute relay makes the Paradise safe to use in dc coupled systems. Together with the anti-oscillation caps it's probably the most important finding in this thread.
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Old 1st April 2013, 11:32 AM   #1956
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by analog_sa View Post
Paradise Builders

Did you change the resistor values as described in JJ's post? This effectively cures the offset problem and together with a power-on/off mute relay makes the Paradise safe to use in dc coupled systems. Together with the anti-oscillation caps it's probably the most important finding in this thread.
Would you please explain ?

What resistors ?
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Old 1st April 2013, 11:38 AM   #1957
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I think it's an old hat by now - and it's in the link above -R43a,b
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Old 1st April 2013, 11:56 AM   #1958
Nick77 is offline Nick77  United States
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Where is the post with numerical printout of board components?
Cant find it........
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Old 1st April 2013, 12:51 PM   #1959
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Hi Nick,
you have to compare the circuit schema
to the Stuffing Guide.
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Old 1st April 2013, 12:55 PM   #1960
Nick77 is offline Nick77  United States
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Quote:
Originally Posted by Benedetto View Post
Hi Nick,
you have to compare the circuit schema
to the Stuffing Guide.
Okay, i coulda sworn someone posted a picture of the board with numerical reference.
Thanks.....
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