hmm... then I Am in the Dark... never seen such issue before..
have you verified with an oscilloscope that you have oscillation..??
have you verified with an oscilloscope that you have oscillation..??
Without being an expert, I think the problem can be around Q11,12,15,16 and
Q4,5,13,14 since it is after the inputstage and right before the riia.
So do you have a suggestion to where to put some caps in those two clusters.
I am blank😱
Q4,5,13,14 since it is after the inputstage and right before the riia.
So do you have a suggestion to where to put some caps in those two clusters.
I am blank😱
I that part of the circuit I have never seen oscillation. that mirror is for injecting current into the the input stage, no signal should flow there.. the one to the rail is much more prone to swing.. you can bypass you Elco-caps with fast film/ceramic to kill what could be..
I´m going to order the parts for the Paraise. At the opportunity I want also order the capacity for the PSU.
Is this PSU good enoguht?
BLANK PROTOTYPING Power Regulator Board PSU PCB BOARD fr TUBE POWER AMPLIFIER | eBay
of course with ultra fast diodes and Caps Panasonic TSHA.
Or it is planned an own PSU "Paraise"?
What Trasformers I need?
Norbert
Is this PSU good enoguht?
BLANK PROTOTYPING Power Regulator Board PSU PCB BOARD fr TUBE POWER AMPLIFIER | eBay
of course with ultra fast diodes and Caps Panasonic TSHA.
Or it is planned an own PSU "Paraise"?
What Trasformers I need?
Norbert
There is a preregulator for the paradise on the drawing table already. If you cant wait, you should at least go for a board with c-r-c possibility.🙂
http://www.diyaudio.com/forums/group-buys/222164-paradise-phono-preregulator-new-post.html
http://www.diyaudio.com/forums/group-buys/222164-paradise-phono-preregulator-new-post.html
That will work fine. But... it would be nice to see some snubbers on those diodes, and to see a few 10ohm (or so) resistors between those big caps.
Ooops, missed the transformer question, got to http://www.diyaudio.com/forums/analogue-source/154210-mpp-713.html#post3146769 #7127 and check it out 🙂
Hi Nick, these are just placeholders, to finetune the CCS current if need be. You can safely ignore them for now
I am now running my boards without the servo opamps, and it seems to solve my oscillation problem, now the offset is very stable but very high too😱
Could it be, that the opamps are not fast enough, or maybe in need of some bypass caps?
I have tried AD711 instead with same bad result.😕
Could it be, that the opamps are not fast enough, or maybe in need of some bypass caps?
I have tried AD711 instead with same bad result.😕
