Methink it's confusing but correct...
Ok then, so.
Apologies for my ignorance and confusion.
I tried to make a sketch how everything is connected, and afaik it’s all there (haven‘t forgotten anything).
I not able to draw it as a true scm, so it’s a bit of a kindergarden attempt...
the 2 Fotos show:
1) The connection from the mains (after the switch) into softstart resp. to speakerdelay. (The speakerdelay is not connected to the softitart-board but just uses it as connection-point. This looks confusing, I did it for lazyness)
2) The connection FROM the softstart TO the toroid's primaries. (Paper is there for visibility)
PS: I had all PSU-parts already switched on, everything seems fine so far: Softstart engages (quick, may need a longer delay), PSU gives 24.8V I believe... Speaker-delay got tested under the sharp eyes of mooly, all good there.
(Please don't read this: Basically, I'm confident it is all well here
)
Ok then, so.
Apologies for my ignorance and confusion.
I tried to make a sketch how everything is connected, and afaik it’s all there (haven‘t forgotten anything).
I not able to draw it as a true scm, so it’s a bit of a kindergarden attempt...
the 2 Fotos show:
1) The connection from the mains (after the switch) into softstart resp. to speakerdelay. (The speakerdelay is not connected to the softitart-board but just uses it as connection-point. This looks confusing, I did it for lazyness)
2) The connection FROM the softstart TO the toroid's primaries. (Paper is there for visibility)
PS: I had all PSU-parts already switched on, everything seems fine so far: Softstart engages (quick, may need a longer delay), PSU gives 24.8V I believe... Speaker-delay got tested under the sharp eyes of mooly, all good there.
(Please don't read this: Basically, I'm confident it is all well here
)Attachments
........
PS: I had all PSU-parts already switched on, everything seems fine so far: Softstart engages (quick, may need a longer delay), PSU gives 24.8V I believe... Speaker-delay got tested under the sharp eyes of mooly, all good there.
(Please don't read this: Basically, I'm confident it is all well here
so what's the problem, then?
quick look at pic sez everything is OK, just take care of damn small xformer - 2R reading is sure sign that you connected it backwards
looks good so far...
ZM, Pico,
I checked it all, made the corrections (wiring details), checked again that primaries/secondaries etc. are all where they belong, grounds connected.
(had to hold my breath) hooked it up with light-bulb tester and nothing went off.
Light-bulb went on (not too bright) and dimmed down to dark/unvisible.
softstart-relay switched on smoothly, delay was ~ 0.6 - 08 sec.
speaker delay relays switched on smoothly, delay ~ 4-5 sec.
measured the rails (first with, then without lightbulb-checker): with 23.something, without 24.59 stable, both channels
These are good signs, aren't they?
ZM, Pico,
I checked it all, made the corrections (wiring details), checked again that primaries/secondaries etc. are all where they belong, grounds connected.
(had to hold my breath) hooked it up with light-bulb tester and nothing went off.
Light-bulb went on (not too bright) and dimmed down to dark/unvisible.
softstart-relay switched on smoothly, delay was ~ 0.6 - 08 sec.
speaker delay relays switched on smoothly, delay ~ 4-5 sec.
measured the rails (first with, then without lightbulb-checker): with 23.something, without 24.59 stable, both channels
These are good signs, aren't they?
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this time something's weird...
HA!
All connected, LED's are all on (need to adjust brightness of the softstart-lights though but that's not to bother you.) which made me expect success.
but: there's plain bold 0000.0 across the source resistors. both channels. (A as well as mA).
offset is adjustable but very jumpy between <1 and >-1 mA.
PSU seems ok, I get +/- 24.6V on both channels...
HA!
All connected, LED's are all on (need to adjust brightness of the softstart-lights though but that's not to bother you.) which made me expect success.
but: there's plain bold 0000.0 across the source resistors. both channels. (A as well as mA).
offset is adjustable but very jumpy between <1 and >-1 mA.
PSU seems ok, I get +/- 24.6V on both channels...
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scm and thoughts
Here are the schematics of the goodies I built.
They are the plain originals straight from the diyaudiostore...
I must say that I did not rely on them for the build.
I had the boards and the BOMs, and (almost) blindly trusted the community...
I don't know, but, what strikes me is that both channels behave exactly the same: power goes properly(?) to the channels, I can manipulate offset and leds are alight...
Then, the helper-boards Soft-Start and Speaker-Delay seem to work fine, but ...
Here are the schematics of the goodies I built.
They are the plain originals straight from the diyaudiostore...
I must say that I did not rely on them for the build.
I had the boards and the BOMs, and (almost
) blindly trusted the community...I don't know, but, what strikes me is that both channels behave exactly the same: power goes properly(?) to the channels, I can manipulate offset and leds are alight...
Then, the helper-boards Soft-Start and Speaker-Delay seem to work fine, but ...
Attachments
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AFAIK, I used NCP431ACLPRAG @ Q11
(That's according to my mouser order-history.)
Not able to verify onboard or to take measurements yet.
(That's according to my mouser order-history.)
Not able to verify onboard or to take measurements yet.