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Old 17th March 2010, 01:27 PM   #1131
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Hi adamus!
how many mA do you use for 1/2 tube 6h6 ?? 15mA, and V in pin 1, 6
thank
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Old 17th March 2010, 01:38 PM   #1132
adamus is offline adamus  United Kingdom
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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).
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Old 17th March 2010, 09:37 PM   #1133
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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?
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Old 17th March 2010, 09:42 PM   #1134
adamus is offline adamus  United Kingdom
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yes, go for 5.5 to 5.6, you want to give the tl431 a bit of an overhead.
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Old 17th March 2010, 09:42 PM   #1135
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Quote:
Originally Posted by adamus View Post
yes, go for 5.5 to 5.6, you want to give the tl431 a bit of an overhead.
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,

Last edited by agithegreat; 17th March 2010 at 09:50 PM.
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Old 18th March 2010, 12:47 AM   #1136
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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
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Old 18th March 2010, 01:09 AM   #1137
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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
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Old 18th March 2010, 08:46 AM   #1138
adamus is offline adamus  United Kingdom
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Quote:
Originally Posted by agithegreat View Post
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,
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?
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Old 18th March 2010, 09:20 AM   #1139
Yunick is offline Yunick  Sweden
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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
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Old 18th March 2010, 09:26 AM   #1140
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it'll only slightly help i am afraid.

there is obviously something systematic going on. only appellizo and quanghao havent experienced this so far (going by replies only...)
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