may I oscillate a bit of feedback?
PSU/HA! 1 seems in perfect working condition, +-24.5VDC (or very close), led lights up and keeps shining several minutes.
PSU/HA! 2 seems good to, same voltage but no led (it's not the led, swapped them to see)
HA! 1 has 15VDC-ish on the LED.
but—HA! 2 has 24VDC-ish on the LED?
edit: haven't changed the build yet, one step closer though...
PSU/HA! 1 seems in perfect working condition, +-24.5VDC (or very close), led lights up and keeps shining several minutes.
PSU/HA! 2 seems good to, same voltage but no led (it's not the led, swapped them to see)
HA! 1 has 15VDC-ish on the LED.
but—HA! 2 has 24VDC-ish on the LED?
edit: haven't changed the build yet, one step closer though...
Attachments
well, pcbs are the same ......... 
obviously, operator is having different number of wine glasses while populating parts ....
either that, or Gremlins
obviously, operator is having different number of wine glasses while populating parts ....
either that, or Gremlins
Didn’t do anything in the meantime but it just popped in mind: the psu and its led worked smoothly before redoing it (mechanics only)… so it may be heading a bit more in direction of dodo… will have to look at it and whip myself.
I AM GREMLIN!
Had a spare 1/2 hour and rechecked things. (Still did not change/build anything...)
Beside one LED—and not the connection on PCB which is good) not working for whatever reason (connection lost or burned), both HA! are very alive and doing well, 24.8VDC both channels.
HA!
(And there's no wine/beer/booze/other substances but nicot-/caffeine)
Had a spare 1/2 hour and rechecked things. (Still did not change/build anything...)
Beside one LED—and not the connection on PCB which is good) not working for whatever reason (connection lost or burned), both HA! are very alive and doing well, 24.8VDC both channels.
HA!
(And there's no wine/beer/booze/other substances but nicot-/caffeine)
Just to waste your time / emphasize how gremlin I am: they both were glowing, once. Hahaha.
Will try to get serious next …
Will try to get serious next …
I was in fiddling mood today and started adjusting the first channel … [emoji851]
After realizing it would be a good idea to plug in the mains, I don’t seem to be able to change offset on the output (reading says 20v!, hopefully another gremlin) while the other readings are good.
Any advice besides behaving, concentrating and connecting everything as it should be?
Won‘t be allowed to continue the next unnkoen amount of time 🙁
After realizing it would be a good idea to plug in the mains, I don’t seem to be able to change offset on the output (reading says 20v!, hopefully another gremlin) while the other readings are good.
Any advice besides behaving, concentrating and connecting everything as it should be?
Won‘t be allowed to continue the next unnkoen amount of time 🙁
Just was thinking about it.
Anything specific or overviews?
(It’s a crowded build in a messy workshop though.)
Anything specific or overviews?
(It’s a crowded build in a messy workshop though.)
I went through the howto.
I believe p104/204 was open not closed, rest… not sure, seems to be greenhornishly correct
Edit: P104/204
I believe p104/204 was open not closed, rest… not sure, seems to be greenhornishly correct
Edit: P104/204
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will have time tonight to look properly at pictures
you know that maxed P104 means maximum possible Iq?
😡
you know that maxed P104 means maximum possible Iq?
😡
check continuity between output parts and heatsink; there reading must be zillioarda of ohms; it is needed to temporary disconnect audio gnd from case
check outputs with diode test, if needed disconnect wires from Ge for that (mosfet is most likely OK)
re-check pinout of Ge
check outputs with diode test, if needed disconnect wires from Ge for that (mosfet is most likely OK)
re-check pinout of Ge
your wiring of 2N1099 looks suspicious, can't see ident pin on your pic clearly
one more thing - what's clearance of NTC pcb to metal beneath?
I'm using 10mm risers there, not 5mm
one more thing - what's clearance of NTC pcb to metal beneath?
I'm using 10mm risers there, not 5mm
Attachments
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Thank you, ZM
I believe I have 10mm spacers too (not sure, and I'm home right now), for the mosfet needs some space under the board.
Connection of 2N1099 was made according to your prototype [this img] triple checked for proper orientation and insulation (heat shrink, nylon washer, keratherm).
Will check it all tomorrow!
BTW: while I was making measurements/adjustments, the heatsink around the mosfet got gently warm, 2N1099 stayed cold (<- scares me most!)
I believe I have 10mm spacers too (not sure, and I'm home right now), for the mosfet needs some space under the board.
Connection of 2N1099 was made according to your prototype [this img] triple checked for proper orientation and insulation (heat shrink, nylon washer, keratherm).
Will check it all tomorrow!
BTW: while I was making measurements/adjustments, the heatsink around the mosfet got gently warm, 2N1099 stayed cold (<- scares me most!)