I progressed on the software updates today.
After the trigger upgrade to support lathed output we have now the possibility to select which input is bypassed while the preamp is off to allow preamp bypass for installation in a home theater system.
So we can decide individually which inputs are bypassed while the preamp is on but also which one is activated as bypass when the preamp is off.
Then I found a VFD in my parts stock and I plan to mount it and verify all the UI, things I never done with the VFD to find little display bugs here and there.
Last thing is to integrate the dual encoder control, probably next week end.
I did as well a lot of good upgrades on my DAC control software that I should include as well in the preamp.
After the trigger upgrade to support lathed output we have now the possibility to select which input is bypassed while the preamp is off to allow preamp bypass for installation in a home theater system.
So we can decide individually which inputs are bypassed while the preamp is on but also which one is activated as bypass when the preamp is off.
Then I found a VFD in my parts stock and I plan to mount it and verify all the UI, things I never done with the VFD to find little display bugs here and there.
Last thing is to integrate the dual encoder control, probably next week end.
I did as well a lot of good upgrades on my DAC control software that I should include as well in the preamp.
great news alex and thank you for your support.
will there be hardware changes on the control pcb?
thx
Oh my ... all that hurry in getting the pcbs... I thought you have it already built.
Its an option and I do like it. But I also like the Dalby Audio Design, I am working on multiple projects and kinda want them to have similar chassis design & look. I've been collecting and researching, hence why I have not finished anything just yet.
just out of curiosity... who has already started ?
i have placed the order at mouser. waiting for the package.
4 UGS modules (2 gain stage + 2 buffer) are already made (i was already using them on my "el cheap-o" pre amp).
BTW, if someone is interested, i have made a fancy heat-sink-coupling-mass for the ugs gain stages. just be aware that suits only the sk389/sj109 combo.
if someone is interested, we can arrange some groupbuy also for them.
I have a cnc at work (where i have done mine...) and i can replicate them at price of cost (+some margin for the consumables).
don't mind the ugly washer's / screw combo, i haven't got the right bolt length, and i have improvised.
Surely can be anozied in whatever color you like.
The triple slot per each side is done in order to take into account the slight differences in the component body width and guarantee the best possibile adhesion.
just let me know.
i have placed the order at mouser. waiting for the package.
4 UGS modules (2 gain stage + 2 buffer) are already made (i was already using them on my "el cheap-o" pre amp).
BTW, if someone is interested, i have made a fancy heat-sink-coupling-mass for the ugs gain stages. just be aware that suits only the sk389/sj109 combo.
if someone is interested, we can arrange some groupbuy also for them.
I have a cnc at work (where i have done mine...) and i can replicate them at price of cost (+some margin for the consumables).
don't mind the ugly washer's / screw combo, i haven't got the right bolt length, and i have improvised.
Surely can be anozied in whatever color you like.
The triple slot per each side is done in order to take into account the slight differences in the component body width and guarantee the best possibile adhesion.
just let me know.
Attachments
in the meanwhile...
can someone make some light around this input matching network ?
how it supposed to be tuned ?
i will use both M1 as gain stage and M2 as buffer.
what is the best input resistance that ugs gain stage is supposed to see ?
my instint says that i will tune that for maxmim Zin... but maybe i am missing something.
thanks
can someone make some light around this input matching network ?
how it supposed to be tuned ?
i will use both M1 as gain stage and M2 as buffer.
what is the best input resistance that ugs gain stage is supposed to see ?
my instint says that i will tune that for maxmim Zin... but maybe i am missing something.
thanks
Attachments
Hi Gionag,
I’m sure Eric and Alex can give more details on the input impedance matching than I can.
In the meantime, the way I adjusted it in my implementation is described here: <<UGS - Muse edition - Page 25>> - 30058092 - sur le forum <<Amplis et Preamplis>> - 1056 - du site Homecinema-fr.com
Basically, without any module and without power, adjust the trimmer for each leg of the circuit in order to get the same measured resistance between AGND and the corresponding test point. I remember setting mine to 12K, but not sure if another value would be more optimal.
Hope it helps
I’m sure Eric and Alex can give more details on the input impedance matching than I can.
In the meantime, the way I adjusted it in my implementation is described here: <<UGS - Muse edition - Page 25>> - 30058092 - sur le forum <<Amplis et Preamplis>> - 1056 - du site Homecinema-fr.com
Basically, without any module and without power, adjust the trimmer for each leg of the circuit in order to get the same measured resistance between AGND and the corresponding test point. I remember setting mine to 12K, but not sure if another value would be more optimal.
Hope it helps
