irrelevant which one (first or second optocoupler arrangement)
if there is not enough of voltage window between SIT and mosfet (they're overlapped practically), you can't squeeze opto bjt in, if there is no space for it
if there is not enough of voltage window between SIT and mosfet (they're overlapped practically), you can't squeeze opto bjt in, if there is no space for it
Well I was able to figure out the problem I. My right channel. It was a broken wire from the RCA to the PCB. Still a PITA replacing it, but better than the alternatives.
I was able to dial the bias in and the offset only drifts a little 10-6 mv in the right and 15-5 mv in the left.
Now time to take the amp off the bench and put it back in the system.
I was able to dial the bias in and the offset only drifts a little 10-6 mv in the right and 15-5 mv in the left.
Now time to take the amp off the bench and put it back in the system.
My Sissy is making sweet music now!
Thanks to Zen Mod for an awesome design!
And of course Nelson!
Prass got me a new set of THF-51's with the right
VGS and the system came right up!
Here are photos for inspection by Mighty Zen Mod!
Thanks to Zen Mod for an awesome design!
And of course Nelson!
Prass got me a new set of THF-51's with the right
VGS and the system came right up!
Here are photos for inspection by Mighty Zen Mod!
Attachments
ANOTHER MAJOR pcb OOKOOP of Omniookoop ZM
Boyz and Girlz
I made a major mistake with SissySIT R2 pcbs*** ( besides that one with short between two resistor pads) - resulting in fact that with (wrong) Edcor 600:15K there is normal expecting gain, while with (proper) Edcor 600:600, prescribed Jensen and prescribed Cinemag - there is gain of just 6db , instead of 12db
bummer was while I was mental juggling with two Edcors and Cinemag and Jensen , among several other things always incorporated in pcb optimization, I made a mistake and took Edcor 600:15K in option , even if his 600:600 cousin is intended for use
so , fix is easy, both channels - cut one tiny trace , solder tiny wire from point A to point B
will post graphical info about fix tomorrow, now going to deeeeeeeeeeepest corner of room, to be embarrassed for a while
****that one having 6-legged optocoupler and just soldering pads for SIT ( instead of proper footprint for P channel mosfet)
Boyz and Girlz
I made a major mistake with SissySIT R2 pcbs*** ( besides that one with short between two resistor pads) - resulting in fact that with (wrong) Edcor 600:15K there is normal expecting gain, while with (proper) Edcor 600:600, prescribed Jensen and prescribed Cinemag - there is gain of just 6db , instead of 12db
bummer was while I was mental juggling with two Edcors and Cinemag and Jensen , among several other things always incorporated in pcb optimization, I made a mistake and took Edcor 600:15K in option , even if his 600:600 cousin is intended for use
so , fix is easy, both channels - cut one tiny trace , solder tiny wire from point A to point B
will post graphical info about fix tomorrow, now going to deeeeeeeeeeepest corner of room, to be embarrassed for a while
****that one having 6-legged optocoupler and just soldering pads for SIT ( instead of proper footprint for P channel mosfet)
Celebration for one more SissySIT joining the world!!!
Is that the 3U/400mm case? What are your temperatures like with the top cover on? Did you get the back panel pre-drilled or did you drill it yourself?
Very nice amp! Are those thermal switches on the heatsink at the back?
This build deserves a 'fugly'!!!
😎
while embarassssssssssssed, I'm feeling not harassssssed with results of this search: https://www.youtube.com/results?search_query=Globe+Unity+Orchestra
Celebration for one more SissySIT joining the world!!!
Is that the 3U/400mm case? What are your temperatures like with the top cover on? Did you get the back panel pre-drilled or did you drill it yourself?
Very nice amp! Are those thermal switches on the heatsink at the back?
This build deserves a 'fugly'!!!
Thanks! Just finished it last night.
Yes, only had a 3U/400 case to use - we'll see how it works.
I'll transplant if I have to.
I have 75C thermal switches on it.
I did the back panel with step-drills, dremel cutoff wheels, and some filing.
Aah, Brötzmann! cool!
Them like Zorn, Frith etc.
Like them a lot but can't listen to very often.
You know naked city or painkiller I am convinced?
and for the kid in youand them kids out there 😀 :
Tape Pull-out Ensemble | テープ引き回し合奏 - Open Reel Ensemble - YouTube
Open Reel Kotatsu Session │ オープンリールコタツ会議 - Open Reel Ensemble - YouTube
Them like Zorn, Frith etc.
Like them a lot but can't listen to very often.
You know naked city or painkiller I am convinced?
and for the kid in youand them kids out there 😀 :
Tape Pull-out Ensemble | テープ引き回し合奏 - Open Reel Ensemble - YouTube
Open Reel Kotatsu Session │ オープンリールコタツ会議 - Open Reel Ensemble - YouTube
Looks like I missed something. May be I didn't follow every post, so, where is writen that I have to use edcor 600:600 and not 600:15k? Every shematic I see shows the 600:15k, so it's already bought. Not a problem, I may use them elsewhere.
Oh yes, first Painkiller album is still unsurpassed! Got the vinyl back in the day.
Love Mick Harris solo work. Scorn's Evanescence album in particular. His last album Cafe Mor is a return to old form:
Cafe Mor | Scorn | Ohm Resistance
Bass, bass and more bass.
do not worry, I'll explain clearly all possible dilemmas
600:15K is working without any change needed, so you're good