Hi
I should have said "this version of Sen". I think that sbelyo was asking whether it was OK to use a dual mono Buffalo with the version proposed- and used very happily by many, including me- for a stereo Buffalo.
But I'm glad I didn't, as thanks to Patrick I've know learnt about alternatives which should suit the ESS1038! One thing though- what kind of batteries should one choose if NiMH types struggle to give sufficiently long operation before recharging? Lithium?
Paul N
I should have said "this version of Sen". I think that sbelyo was asking whether it was OK to use a dual mono Buffalo with the version proposed- and used very happily by many, including me- for a stereo Buffalo.
But I'm glad I didn't, as thanks to Patrick I've know learnt about alternatives which should suit the ESS1038! One thing though- what kind of batteries should one choose if NiMH types struggle to give sufficiently long operation before recharging? Lithium?
Paul N
Tested prototype.
The DAC is a discrete, balanced version of the Signalyst DSC1 i.e. the DSC2... The digital side is discrete DSD, SMD and clock optimized. The analog board incorporates the SEN I-V feeding the Wurcer Discrete OP Amp http://www.diyaudio.com/forums/anal...screte-opamp-open-design-156.html#post3192755 (which also employs the BF862 and which is also cascoded) as the basis of a 4 pole SK filter. http://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-45.html#post5000000
The analog board is mirrored.
A dual mono BufIII will output 16mA per Iout. Your bias will need to be around 64mA allowing for only 25% swing. I see in the DIYAudio store a "D" grade LSK170/LSJ74 can be as high as 30mA Idss so you could try a matched pair k170/j74 per channel for CEN (can the XEN sinks work for this?) or more reasonably find a quad of 16mA Idss for which you can then use the boards as is, if available. The Riv will probably need to be lowered (perhaps 100Ω), but you will have the benefit of an even lower Zout.
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Maybe I'll get the stereo version working first. I did buy 4 matched quads of the 2SK369V just in case
Perfectly OK.
Just a bit large and you need to charge them individually for proper balancing.
Patrick
Just a bit large and you need to charge them individually for proper balancing.
Patrick
The batteries are not matched and may not different capacities.
So in order to avoid one of them being over-discharged, it is normal practice to charge them individually.
Common practice for model making people.
In fact, for lithium batteries, there are special ICs widely available for precisely that purpose.
Patrick
So in order to avoid one of them being over-discharged, it is normal practice to charge them individually.
Common practice for model making people.
In fact, for lithium batteries, there are special ICs widely available for precisely that purpose.
Patrick
The Dual Bank power supply design that I posted was developed for precisely the needs of having multiple floating supplies using either supercaps and/or batteries. For batteries, the MOSFET relays disconnect the batteries and charge individually and then connect in series for supply. Neither of the dual banks are ever intended to be drained more than 10%.
SEN IV board and parts
Hello, I was wondering if I could still get the boards and parts for the SEN IV somewhere? Thank you!
Hello, I was wondering if I could still get the boards and parts for the SEN IV somewhere? Thank you!
You can get matched FETs from NicMac.
And it is totally viable to make the circuit using Vero boards.
Patrick
And it is totally viable to make the circuit using Vero boards.
Patrick
There must be something I am doing wrong: I have a sen for the ESS9018. The sen has 4 2sk369 and drains 44mA. Riv is 400 ohm. I get 0.6V signal with 3% distortion. The sen is fed with 16.2 V batteries. Vref is around 1.6V.
Any hint ?
D.
Any hint ?
D.
> Any hint ?
Nothing obvious. All seem fine to me.
Maybe check with NicMac.
He has a ES9018 SEN, I don't.
Patrick
Nothing obvious. All seem fine to me.
Maybe check with NicMac.
He has a ES9018 SEN, I don't.
Patrick
Can you post pictures on how everything is connected? It will make it easier too see if anything is different from our working builds.
can you please post link to that
Nick
which Is your preffered cap for I/V
