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Old 8th April 2012, 02:25 PM   #5711
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Michael, please give Frans the current demand.
I like the new solution without aditional cascode, it is simpler and as good so potentially better sounding because there is less semiconductor in the signal chain.
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Old 8th April 2012, 04:18 PM   #5712
MiiB is online now MiiB  Denmark
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Compared to the "old" paradise.. I do believe this revision 2 is way better...

Feel free to use the BC transistors in the mirror also. I think that they are a brilliant choice, but as stated, the quad arrays makes the design less prone to errors.

I have been working a little more and I can see one Jfet is at the limit, so it has now in doubled and current set at app 16mA input/mirror and 10mA through the buffer (only one sk170 left due to lowish cob. bf862 would also make a fine choice here..)

total consumption is then app 75 mA at both rails. Current can be lowered to app 50 mA if current is set at app 10ma trough the input/mirrors.(a change from 4 to 2,5mA each input transistor)
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Last edited by MiiB; 8th April 2012 at 04:25 PM.
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Old 8th April 2012, 05:41 PM   #5713
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Thanks Michael. We should freeze this design now.
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Old 8th April 2012, 06:31 PM   #5714
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Quote:
Originally Posted by MiiB View Post
Compared to the "old" paradise.. I do believe this revision 2 is way better...

Feel free to use the BC transistors in the mirror also. I think that they are a brilliant choice, but as stated, the quad arrays makes the design less prone to errors.

I have been working a little more and I can see one Jfet is at the limit, so it has now in doubled and current set at app 16mA input/mirror and 10mA through the buffer (only one sk170 left due to lowish cob. bf862 would also make a fine choice here..)

total consumption is then app 75 mA at both rails. Current can be lowered to app 50 mA if current is set at app 10ma trough the input/mirrors.(a change from 4 to 2,5mA each input transistor)
I will setup the PSU with an 75 * 1.5 = 110 mA CCS.
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Old 8th April 2012, 08:03 PM   #5715
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OK, fine.
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Old 9th April 2012, 12:43 PM   #5716
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Here is one, the mini ATL PSU + side. About 5 cm2
And now there are two (+15V and the 'dark'-side -15V)
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Old 9th April 2012, 04:16 PM   #5717
MiiB is online now MiiB  Denmark
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so you plan to integrate those into the center of the paradise too..??
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Old 9th April 2012, 05:36 PM   #5718
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so you plan to integrate those into the center of the paradise too..??
No these are intended for amplifiers, when you need to feed one or two opamps, they are underpowered for the 'Paradise DIY'. See also Mpp but they operate exactly the same.
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Old 9th April 2012, 06:41 PM   #5719
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Really cute. We should do a PCB for this mini shunts too. Any voluntary ?
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Old 10th April 2012, 06:13 AM   #5720
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Really cute. We should do a PCB for this mini shunts too. Any voluntary ?
I am working on that
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