What have you got between the transformer and the shunt reg? Is it the tube-i-zator power supply with CRC?
I mean, something's wrong, for sure. I have mine working first time like Oliver and it looks pretty similar.
How are you testing it? I think you should post more pics of how you've wired it all up, including the tube-i-zator etc. and even multimeter results so it can be seen where you are testing across.
I mean, something's wrong, for sure. I have mine working first time like Oliver and it looks pretty similar.
How are you testing it? I think you should post more pics of how you've wired it all up, including the tube-i-zator etc. and even multimeter results so it can be seen where you are testing across.
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that's for sure... what is really confusing me is that a different made board (quanghao) work without problems... i can see only a misplacement on Oliver's board... later i'll post more pics and details on wiring...
If every part is ok then it works perfect. I think we should share some measutrements on the board!
Somewhere i read that PRP has a batch resistors with a wrong value printing, but i don´t know where.
Anyway, are the insert values correct?
Anyway, are the insert values correct?
It is quite likely to be something very odd like wrongly marked resistors or a faulty part. It must be so annoying!
hi people...i'll start dismanteling of a board tomorrow, checking every R value and changing all the IC's, fortunately i have a couple spare set from another source that is running on the quanghao board...
later.... (and thanks)
later.... (and thanks)
My tube-i-zator board up and running...i set it up to test voltages.
All is working perfectly 🙂
Tfan69 Check to see that your 1k varisistor is working!! I have a 5k varisistor intalled in mine and at certain ranges i was also getting the same or minus 2v from the input voltage...changing the value on the varisistor fixed this and output voltage was about -25v from the input voltage.
Alon
All is working perfectly 🙂
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Tfan69 Check to see that your 1k varisistor is working!! I have a 5k varisistor intalled in mine and at certain ranges i was also getting the same or minus 2v from the input voltage...changing the value on the varisistor fixed this and output voltage was about -25v from the input voltage.
Alon
It is a sensible suggestion - the variable resistor on the shunt. If you try a larger value, it will have a larger range, though not as easy to refine.
I intend on replacing all of my variable resistors on the final build. Although future voltage drift can be remedied with a variable, I am of the assumption that it is probably also the most likely cause of any such drift. Is that right?
I intend on replacing all of my variable resistors on the final build. Although future voltage drift can be remedied with a variable, I am of the assumption that it is probably also the most likely cause of any such drift. Is that right?
guys the problem isn't the trimmer.. it is working fine.. the problem that there isn't voltage drift regulating the trimmer, Vin lowers its value instead of remaing stable and having Vout regulated from the shunt...
I guess the only thing to do then, is to isolate and check all of the resistors and caps and if all ok, then replace the transistors.
done.. checked all resistors and caps, everything is correct, changed also all the transistors, same stuff 🙁
The QH layout has rectification and CRC on board if I remember correctly. Oliver's is reg only. Since you have checked everything else and 3 guys are showing same stuff exactly like yours working, its either cursed 
or there is a difference in what's feeding it? What comprises your rectification and pre filtering? Are your input cables long by the way? Decouple its input with 1uF from +In to ground directly on reg's input for instance.
or there is a difference in what's feeding it? What comprises your rectification and pre filtering? Are your input cables long by the way? Decouple its input with 1uF from +In to ground directly on reg's input for instance.
hello Salas,
i tried oliver reg in my aikido, same stuff... tried QH board (w/o on board rectification) on the dac.. it (of course) works
no long cables (10cm)
i just come back to the shop with some green leds.. somehow i suspect that the problem lies here... let's see how it goes
i tried oliver reg in my aikido, same stuff... tried QH board (w/o on board rectification) on the dac.. it (of course) works
no long cables (10cm)
i just come back to the shop with some green leds.. somehow i suspect that the problem lies here... let's see how it goes
changed the leds.. no changes.. i'll try to docouple with a 1uF cap to ground
diodes and CRC filter like oliver and the other guys
disconnected all the zeners, same....
could you give me some tension references on the various points of the circuit to check please?
could you give me some tension references on the various points of the circuit to check please?
yesterday a friend come to help me, he's quite expert as electronics assembly/repair is his job..
we checked everything without success, but we found that when trimmering the shunt the AC before the rectification dropped as well... looks like there is some dispersion somewhere... the transformer is the one you suggested for the tubeizator earlier in this thread...
me confused... don't know what to check.. i'll build one p2p and see what happens..
we checked everything without success, but we found that when trimmering the shunt the AC before the rectification dropped as well... looks like there is some dispersion somewhere... the transformer is the one you suggested for the tubeizator earlier in this thread...
me confused... don't know what to check.. i'll build one p2p and see what happens..
Here are some measurements after 1 hr warmup
An externally hosted image should be here but it was not working when we last tested it.
Hi Alon,
perfect work
Please be careful and don´t make a HV short at the top of the capacitor
Tube-I-zator Pre-Orders:
------------------------
Cris H. - 1x (please change to your nickname yourself!)
Jacques Merde - 2x
northcool - 1x
acccruz - 1x
hawall841 - 1x
morpheous - 1x
neoinc - 1x
Crusty - 1x
HV-Shunt Module Pre-Order for 2nd Batch:
-----------------------------------------
Jean-Charles - 2x
kamaths - 3x
bequerel - 2x
morpheous - 2x
ksnider1 - 1x
ipolyakov - 2x
savvas - 2x
hawall841 - 1x
NeoInc - 1x
Ryssen - 2x
WhiteBull - 2x
I think we could start the 2nd batch for the HV-Shunt Module.
All members in the pre-order list get a PM from me!
------------------------
Cris H. - 1x (please change to your nickname yourself!)
Jacques Merde - 2x
northcool - 1x
acccruz - 1x
hawall841 - 1x
morpheous - 1x
neoinc - 1x
Crusty - 1x
HV-Shunt Module Pre-Order for 2nd Batch:
-----------------------------------------
Jean-Charles - 2x
kamaths - 3x
bequerel - 2x
morpheous - 2x
ksnider1 - 1x
ipolyakov - 2x
savvas - 2x
hawall841 - 1x
NeoInc - 1x
Ryssen - 2x
WhiteBull - 2x
I think we could start the 2nd batch for the HV-Shunt Module.
All members in the pre-order list get a PM from me!