AN Dac Zero question

[Ali Tait]

Been fiddlin' with the dac this afternoon,looking to connect a regulated linear supply to see if it'll improve things.Looking at the mains trannie secondaries,there is a 0-300v to a plastic connector on the pcb,which obviously is the HT for the valve.There is another connector,which has a 0-10v,and also a 9-0-9v supply.There is a bridge rectifier after this and on the other side of this I found 5v dc,to which I connected the linear supply,assuming this is the supply for the dac chip(a cs8414cs).Having disconnected the connector,I fired up the dac and it works,however the gain is less,and on a par in fact with my passived 7510.My question is,I'm guessing one of the secondaries provides this 5v,but what does the other do? Some sort of gain stage? I'm contemplating cutting one of the supplies away from the connector and plugging it back in,but I thought I'd ask first!

Ta.

[Ali Tait]

I forgot to say,The output is lower as it stands,in fact on a par with the passived 7510,when before the output was higher.

[Ali Tait]

Further,interestingly,as soon as I put the dac on with the linear supply,Michelle came through and said,"What have you done to the hi-fi? It sounds like vinyl!"

[Ali Tait]

Also just noticed,there seems to be an increase in background hiss with no music playing.

[colinB]

Isnt womans perceptive logic just brilliant sometimes:)

[Ali Tait]

And she heard it from the kitchen!

[colinB]

Golden ears!

[DSJR]

Sounds like vinyl, what have you done to downgrade it so.......? :eek: :lol:

[Ali Tait]

Good question! I'll leave it for a day or two and swap back.It does seem to have a more relaxed presentation though.I'll fiddle a bit more tomorrow.