So im making one P3A more .....
This time i thought like testing 1216 -2922 Lapt combo
if my rails are more or less up to 36+36 volts i am ok above that i get oscilation
anyone gan guess why?
is it because 1216-2922 is lapt ?
with in the day i will replace them with the standard 1302-3281 combo to make sure thta nothing else is wrong in the circuit and get back ...
this is a bit weird since all the rest is pretty much the same and i ve made this board and choice of parts a gozillion times .
This time i thought like testing 1216 -2922 Lapt combo
if my rails are more or less up to 36+36 volts i am ok above that i get oscilation
anyone gan guess why?
is it because 1216-2922 is lapt ?
with in the day i will replace them with the standard 1302-3281 combo to make sure thta nothing else is wrong in the circuit and get back ...
this is a bit weird since all the rest is pretty much the same and i ve made this board and choice of parts a gozillion times .
Looked at circuits that operate with 2922 -1216 EFP though
there is 47pf miller on the VAS stages both sides nothing on the drivers but then drivers are only 60MHZ in my case drivers are 200MHZ and the styleis CFP ( marantz 9200)
yet again in M03 that uses the same combo miller compensation is inthe drivers both sides and only 47 Pf
there is 47pf miller on the VAS stages both sides nothing on the drivers but then drivers are only 60MHZ in my case drivers are 200MHZ and the styleis CFP ( marantz 9200)
yet again in M03 that uses the same combo miller compensation is inthe drivers both sides and only 47 Pf
Sad to say but completely CONFIRMED !!
Replaced the output with 1302 -3281 and all is just fine as usual
everything : bias, ofset ,bandwidth
I t seems that the circuit of P3A is not able to drive those lapts .... Probably other measures of compensation is needed
kind regards
Sakis
Replaced the output with 1302 -3281 and all is just fine as usual
everything : bias, ofset ,bandwidth
I t seems that the circuit of P3A is not able to drive those lapts .... Probably other measures of compensation is needed
kind regards
Sakis
It is a completely different circuit. It will need a redesign of the compensation, but no reason why it would not work well.
Jan
Jan
I've found MJL1302AG and MJL3281AG at Farnell, are they suitable for the P3A?
