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Old 5th December 2012, 03:59 PM   #431
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Can you see an oscillation at the output of the Paradise ?
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Old 5th December 2012, 03:59 PM   #432
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Quote:
Originally Posted by Joachim Gerhard View Post
Base stoppers before each input transistor, say 4.7 to 10 Ohm.
Ok. As this will involve desoldering them from the board do you think i should just leave one pair while experimenting?

Last edited by analog_sa; 5th December 2012 at 04:10 PM.
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Old 5th December 2012, 04:14 PM   #433
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Quote:
Originally Posted by Joachim Gerhard View Post
Can you see an oscillation at the output of the Paradise ?

Yes, this is the main issue. The apparent dc wandering is probably also a result of the oscillation.

Later tonight i will try taking out the helper transistors and if this doesn't help will also try the base stoppers. I guess these were not in designed in because of the additional noise.
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Old 5th December 2012, 04:24 PM   #434
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Yes, but 10 Ohm divided by 8 is not much.
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Old 5th December 2012, 04:25 PM   #435
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You can cut the base wires and insert the stoppers there. That way you do not have to desolder.
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Old 5th December 2012, 05:00 PM   #436
pdul is offline pdul  Denmark
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Quote:

Join Date: Aug 2012 resistors

--------------------------------------------------------------------------------

hey guys, did anyone of you use
PRP PR9372 0,25W resistors
to built the paradise R3, or some other kind of 0,25W resistor?
or has everybody used the CMF55?
I used the good old MRS25 0,6w and Velwyn 0,1% for the RIAA
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Old 5th December 2012, 09:55 PM   #437
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THE ALAN PARSONS PROJECT - Eye in the Sky - Live in Houston 1996 - Very rare video - YouTube
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Old 6th December 2012, 07:23 AM   #438
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Later tonight i will try taking out the helper transistors and if this doesn't help will also try the base stoppers.


Didn't do any of this. The time spent on this project simply hit a stop loss and it's being shelved.

It is very seldom that i build analogue projects on pcbs. It is usually dead bug style or multilevel protoboards. Temptation to follow an easy route took over this time but for some reason did not work for me. If i get free i will probably prototype the whole thing and find parts which will work together. And maybe leave it on a proto board. The entire ground plane concept for an analogue circuit is not much to my liking anyway.

Many thanks to Joachim and Hesener for their time and helpful suggestions.
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Old 6th December 2012, 07:59 AM   #439
hesener is offline hesener  Germany
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Hi analog_sa, don't give up so quickly! This is a high performance circuit, and it might just be a couple small things that spoil the fun.....

ground planes have been used in analog for some time, much longer time for RF actually. If done well, they are very helpful to circuit performance. Personally I don't think its the ground plane that is at fault here. PM sent.....
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Old 6th December 2012, 08:22 AM   #440
pdul is offline pdul  Denmark
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Hi analog_sa, don't give up so quickly! This is a high performance circuit, and it might just be a couple small things that spoil the fun.....

ground planes have been used in analog for some time, much longer time for RF actually. If done well, they are very helpful to circuit performance. Personally I don't think its the ground plane that is at fault here. PM sent
Isnt it possible to put some caps strategicly to limit the bandwid a little, it really makes my heart bleed to just think about cutting traces on those nicey boards. My hearing is not so good in the 5Mhz+ region anyway?
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