Contact Spencer who is a diyaudio member selling the D1 clone board here. He may have some CS8414 for sale.
http://www.fetaudio.com/
It will be a while longer before I start building up my DAC-END2 as I have a few other projects that I need to finish. I have already bought and plan to use the Sowter 9762 transformers. I also have my own tube output board I'll be using with a CCS loaded 6H30p-DR. The tranformer will go directly after the 220R I/V, and the out put stage just after the transformer.
here's the link:
Sowter Transformer 9762 DAC INTERFACE FOR AD1865N-J
Jeff Davison
here's the link:
Sowter Transformer 9762 DAC INTERFACE FOR AD1865N-J
Jeff Davison
Hi Quanghao,
I received a set of pcbś from you last week and am pretty sure this was sent by mistake as one set was ordered. I sent an email to your mail account with details.
Cheers,
dshambala
I received a set of pcbś from you last week and am pretty sure this was sent by mistake as one set was ordered. I sent an email to your mail account with details.
Cheers,
dshambala
I have 2 chip AD1864, so can I use it for this DAC. And I have 6DJ8, 12AX7, 12AT7, what is good for the I/V( for the best midrange).
finished the dac. I am pleased with the front panel (schaeffer ge)
An externally hosted image should be here but it was not working when we last tested it.
with LED bias and CCS i am very pleased with the sound... its natural yet detailed.
CSS has been removed temporarily as i need to work out better heatsinking, or just put a big resistor with the B+ to drop it to 180v or thereabouts.
without the CSS i think it actually suits my fullrange speakers better, a little more warmth and less detail but it doesnt suit my 3way speakers as much (which to be honest arent that good speakers anyway).
the best improvement was the LED bias, it suprised me to be honest!
CSS has been removed temporarily as i need to work out better heatsinking, or just put a big resistor with the B+ to drop it to 180v or thereabouts.
without the CSS i think it actually suits my fullrange speakers better, a little more warmth and less detail but it doesnt suit my 3way speakers as much (which to be honest arent that good speakers anyway).
the best improvement was the LED bias, it suprised me to be honest!
I will try for you.
one of the big positives of led bias is the removal of the bypass cap though. I dont think the small negative feedback produced is a bad thing either.
one of the big positives of led bias is the removal of the bypass cap though. I dont think the small negative feedback produced is a bad thing either.
I am still using the 5687
with the css 12ma per triode, anode at around 90v
I need to drop the B+, the CCs is dissapating too much heat!!! so its temporarily removed.
IF i were to use 6n6p then i would go for 18ma i think (looking at the curves).
with the css 12ma per triode, anode at around 90v
I need to drop the B+, the CCs is dissapating too much heat!!! so its temporarily removed.
IF i were to use 6n6p then i would go for 18ma i think (looking at the curves).
What voltage should i aim for on the salas, and the digi and analog?
I have 5.16v at the moment on every part of the salas, thats when the dac board is on but no cs8414 or ad chip.
Across the 431 i get 5.01 on both the analog + and - and the digi.
Is 5.01 ok? Should i raise the 5.16v?
I have 5.16v at the moment on every part of the salas, thats when the dac board is on but no cs8414 or ad chip.
Across the 431 i get 5.01 on both the analog + and - and the digi.
Is 5.01 ok? Should i raise the 5.16v?
Cool, thanks.
EDIT: Right just turned them up. Max i get on digi is 5.19 on load on salas, which gives me 5.01 still after 431.
On 5 analog i get 5.29, then after 431 i get 5.02.
On -5 analog i get 5.59, the after 431 i get 5.02.
Why the low figures for the +'vs?
This is with the dac on as i said, without the cs and ad though,
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EDIT: Right just turned them up. Max i get on digi is 5.19 on load on salas, which gives me 5.01 still after 431.
On 5 analog i get 5.29, then after 431 i get 5.02.
On -5 analog i get 5.59, the after 431 i get 5.02.
Why the low figures for the +'vs?
This is with the dac on as i said, without the cs and ad though,[/QUOTE]
Because I need the security of the chip, so for low voltage
On 5 analog i get 5.29, then after 431 i get 5.02.
On -5 analog i get 5.59, the after 431 i get 5.02.
Why the low figures for the +'vs?
This is with the dac on as i said, without the cs and ad though,[/QUOTE]
Because I need the security of the chip, so for low voltage
Quanghao,
I received an extra set of boards from you. Id like to keep the shunt reg pcb and I dont have your address. Ive sent you email.
dshambala
I received an extra set of boards from you. Id like to keep the shunt reg pcb and I dont have your address. Ive sent you email.
dshambala
same for me if you read back, infact exactly the same on the 5+v dig.
At 'max' the salas board is not regulating, the final mosfet isnt doing anything. its not ideal, but increase parallel another 27r with the rset resistors which will increase the 5.19 to 5.3 ish... then back off a little to ensure regulation. The tl431 doesnt need much headroom unless my scope is lying.
Salas, i had a play with the dig line. when the shunt reg 'maxes out' the vgs goes to zero on the final mosfet. back off a little and it comes up to 4v or there abouts. any ideas?
I have the exact same "problem". With DAC-board attached I get zero vgs on the last mosfet and about 5.16-5.18V before the TL431.
This is without the CS8414 and AD1865 installed.
As soon as I find some time I'll try as Adamus to parallel a 27r with Rset
This is without the CS8414 and AD1865 installed.
As soon as I find some time I'll try as Adamus to parallel a 27r with Rset
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