Dowser
Learning to bodge again..
So, Graham's #2 now has an S1 DAC, plus 10nF decoupling between I/V opamp +/- pins, plus a 10uF Wima between DAC -15v & +5v pins, and Flea OP2 is used to power SAA7310 directly. I also re-positioned the Flea to allow the 1541 and 7220 to breathe...this means a longer run between Flea OP and chips;
Comparing #1 & #2 - subjectively, I now easily prefer Graham's #2 (sorry Graham, I reckon you are wrong on the R1 DAC ). However, I also realised I am running different mains cables (stock and big thick jobbie) and ICs between #1 & #2 and pre - Linn ICs from #2 & stock mains, some unkown IC and thick mains cable from #1 - swapping them sees me prefer Graham's subjectively even more.
Enough for tonight now, I'm just going to listen to #2 - I am dosed up on pain killers after surgery, so any thoughts I have are unreliable at best currently
While at it, I traced out some of the regulator strategy used in the CDi, I will update the other thread in here tomorrow to look for the best way forward to provide an isolated supply to the 7220.
No worries Graham - thank you for giving me the opportunity to get both running again - much easier when you have something to compare a faulty item with From what I've heard so far, I need 2 negative ALWSRs so I can also power the output stages of #1 with them too!
Richard
Comparing #1 & #2 - subjectively, I now easily prefer Graham's #2 (sorry Graham, I reckon you are wrong on the R1 DAC ). However, I also realised I am running different mains cables (stock and big thick jobbie) and ICs between #1 & #2 and pre - Linn ICs from #2 & stock mains, some unkown IC and thick mains cable from #1 - swapping them sees me prefer Graham's subjectively even more.
Enough for tonight now, I'm just going to listen to #2 - I am dosed up on pain killers after surgery, so any thoughts I have are unreliable at best currently
While at it, I traced out some of the regulator strategy used in the CDi, I will update the other thread in here tomorrow to look for the best way forward to provide an isolated supply to the 7220.
I've got to say 'nice one' Richard and glad you now have both up and running. I just didn't/don't have the enthusiasm.... Doing other projects....
No worries Graham - thank you for giving me the opportunity to get both running again - much easier when you have something to compare a faulty item with From what I've heard so far, I need 2 negative ALWSRs so I can also power the output stages of #1 with them too!
Richard