here it is ;
result of collaboration of few Serbian DiyAs - one engineer mind (sp300b) and one sick mind (ZM)
as usual - ZM does all back of napkin drawings and some testing , sp300b does some much more testing and pcbs ;
find schematics enclosed ; pcbs are in stage of testing ..... in fact - pcbs for PSM Optical Volume
are ordered , and pcbs for separate buffer are in developing ;
first - PSMLS schematic ; nice drawn by sp300b ( not in my usual gorgeoushandscribing way )
it's intended either for stereo balanced or stereo unbalanced ( omitting
4 LDRs)
result of collaboration of few Serbian DiyAs - one engineer mind (sp300b) and one sick mind (ZM)
as usual - ZM does all back of napkin drawings and some testing , sp300b does some much more testing and pcbs ;
find schematics enclosed ; pcbs are in stage of testing ..... in fact - pcbs for PSM Optical Volume
are ordered , and pcbs for separate buffer are in developing ;
first - PSMLS schematic ; nice drawn by sp300b ( not in my usual gorgeoushandscribing way )
it's intended either for stereo balanced or stereo unbalanced ( omitting
4 LDRs)
Attachments
Last edited by a moderator:
separate pcb for buffers and dedicated supply/reg will contain 4 buffers
.........4 pcs of good ole JC buffer , as sp300b's wish ...... even if I intent to use real poor man's choice - pair of J310 jfets in "source follower up/CCS bellow" configuration .....
this time my fave back of napkin drawing
.........4 pcs of good ole JC buffer , as sp300b's wish ...... even if I intent to use real poor man's choice - pair of J310 jfets in "source follower up/CCS bellow" configuration .....
this time my fave back of napkin drawing
Attachments
spavleski said:........
I hope now is time to leave that stick from your hand - resting ......
I'll be back to my usual lazynessssssss
Manu said:........
The question is : will it drive F4?
yup , certainly - if instead buffer part you use
steenoe said:ZM & Spavleski, great job
Where can we order, I wanna try some of that lightnin' stuff.
Nice little supply for the buffer.
not yet , ya kwayzee danske ;
I have enough duties regarding our local GB ........... and just when first pcb be tested I can tell that's OK
PSM LS pcbs are on fab , buffer pcbs are still in work
reg for buffer is nothing special , except one little trick ,and even that is boiled water
I'm sorta shy-proud with LS circ ..... buffer reg is trivial
DVBjunky said:Me too...me too!
ZenMod, will we get a detailed description of the "Schematic" of the PoorSerbianManLightspeed.....whats different compared to the lightspeed Mk2 or Papa´s LDR?
You like the J310 jfets? Tell us more
Thanks in advance.
cheers
Alan
difference between Mk's of Lightspeed is ( at least as I see it ) is that Mk1 is series fixed resistor/LDR to gnd , and Mk2 is LDRs in both positions .....
so - solution here is same as in MK2 and in Papa's version - LDRs in both positions , so just reg is different , with few other tricks in it .
here is different , comparing to Papa's only that we used rather primary current regulator than voltage regulator ..... in fact - there is not much different , but I have impression that this variant is pretty good ;
NB - I didn't analyzed Papa's circ in deep , so I can't tell right now is it current or voltage oriented (even if that's just matter of wiev) ;
I just goes for different solution ...
parallel resistor to lin pot is trick borrowed from Eliot Sound ( his site is treasure indeed)
regarding J309/310 jfets - I'm using them in my
I see them as 2SK170V ...... on steroids
apassgear said:Very nice work ZM, are you planning a GB over here?
we'll see - when everything pass testing ......
'till then .....
Zen Mod said:I have enough duties regarding our local GB
Does "local" includes Betsch?
Manuelovic
Manu said:
Does "local" includes Betsch?
Manuelovic
ya know that I luv ya ;
ZM ordered just two pcbs ; one is for ya ........
( and that just because Betsch is almost Batsch )
I hope you know that I love you too
and mucho ...
Of course just because that ...
But tnx nevertheless
Manu
and mucho ...
Zen Mod said:
( and that just because Betsch is almost Batsch )
Of course just because that ...
But tnx nevertheless
Manu
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