Caps are al 50V so should be OK then. The input voltage puzzles me also. PSU has a 50VA toroid followed bij CRCRC. No problems before. I can try what happens if I load it with a 1K resistor. If the voltage collapses, something is wrong with the PSU. Currently I have no load on the output of the super reg. Sense and out/return are connected though to obtain a correct voltage reading.
Well, if you measure 32V at the supply and 26V at the SR, there's an issue with the wiring.
That should be resolved first of all.
You can do a resistance measurement between the end points of the cables you think are connected on each side, should of course be close to 0 ohms.
And also between cables, should be close to infinite ohms of course.
All without stuff connected .
Jan
That should be resolved first of all.
You can do a resistance measurement between the end points of the cables you think are connected on each side, should of course be close to 0 ohms.
And also between cables, should be close to infinite ohms of course.
All without stuff connected .
Jan
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I thought the raw supply was 32v disconnected, but dropped to 26 V when connected to the reg. Maybe some clarification is needed.
Turns out it was the pass device. I replaced it and the led lights up, output measures 24.01V (tiny bit more than before), pins 2 and 3 of the opamp measure the same voltage. At the input I now measure a bit over 30V, which is the same as the raw PSU voltage when loaded with a 1k resistor (PSU output voltage drops by 1.6V in that case). So I guess all is ok now. Luckily I ordered a spare part. No more shorts allowed from here on ;-)
Thanks for all the help!
Thanks for all the help!
sorry for a beginner`s question.
If I use a 500VA 230/230V autotrafo at the beginning of my PC and Audio Analogue 2 oscilloscope, do I get a FULLY DIFFERENTIAL probe on at least 1 channel? So that i can put the earth of my oscillloscope anywehere in Superregulator or a JLH 1996 amplifier ?
Or if i put it on the power supply of SuperJung and JLH, can i measure anywhere with my Audio Analogue 2 withouf worry about shortcircuit?
In other word, can i get by without buying a differential probe, or just need to buy 1 instead of 2 for 2 channels?
a 500VA 230/230V autotransformer is 4x cheaper than a high sensitivity fully differential probe..
If I use a 500VA 230/230V autotrafo at the beginning of my PC and Audio Analogue 2 oscilloscope, do I get a FULLY DIFFERENTIAL probe on at least 1 channel? So that i can put the earth of my oscillloscope anywehere in Superregulator or a JLH 1996 amplifier ?
Or if i put it on the power supply of SuperJung and JLH, can i measure anywhere with my Audio Analogue 2 withouf worry about shortcircuit?
In other word, can i get by without buying a differential probe, or just need to buy 1 instead of 2 for 2 channels?
a 500VA 230/230V autotransformer is 4x cheaper than a high sensitivity fully differential probe..
In general, an autotransformer is not isolated from the mains, so that would not work.
You would also have all that capacitance from a floating PC on your circuit which makes it a bit unreliable that what you see is what's there.
But why not use two scope channels and set it to subtract? That would give you the diff capability.
BTW Do you mean Analog Discovery 2 scope?
Jan
You would also have all that capacitance from a floating PC on your circuit which makes it a bit unreliable that what you see is what's there.
But why not use two scope channels and set it to subtract? That would give you the diff capability.
BTW Do you mean Analog Discovery 2 scope?
Jan
i belive that a separating trafo 230/230V IS to separate galvanically. I thought, that if my oscilloscope gets isolated from common ground, it will become "fully differential" on 1 channel of my Analog Discovery 2 scope.
I already orderd myselft those 2 trafos for next experiments with SuperRegulator
https://sklep.toroidy.pl/en_US/p/STS0500-Transformer-TS-500VA-230230V/120
https://allegro.pl/oferta/autotrans...xYjlhMGU5YTJlYTRiNjIxYzM4M2YyMzY0ZjFkMmZiOGU=
now i`m torn between buying additional FOUR CH 100MHz scope (economy siglent 500$) to use as a 2 CH fully diff.
https://siglent.com.pl/pl/c/Seria-SDS1000X-U/64
I`m on the budget, so i`m not sure about those high sensitivity differential probes for around 400$:
https://siglent.com.pl/pl/p/Pintek-DP-60HS-Napieciowa-Sonda-Roznicowa-/93
basically i`m a learning enthusiast on a budget, who wants to be able to measure everything of importance within the power supply, also for future experiments with low current shunt regulators for active crossovers.
I already orderd myselft those 2 trafos for next experiments with SuperRegulator
https://sklep.toroidy.pl/en_US/p/STS0500-Transformer-TS-500VA-230230V/120
https://allegro.pl/oferta/autotrans...xYjlhMGU5YTJlYTRiNjIxYzM4M2YyMzY0ZjFkMmZiOGU=
now i`m torn between buying additional FOUR CH 100MHz scope (economy siglent 500$) to use as a 2 CH fully diff.
https://siglent.com.pl/pl/c/Seria-SDS1000X-U/64
I`m on the budget, so i`m not sure about those high sensitivity differential probes for around 400$:
https://siglent.com.pl/pl/p/Pintek-DP-60HS-Napieciowa-Sonda-Roznicowa-/93
basically i`m a learning enthusiast on a budget, who wants to be able to measure everything of importance within the power supply, also for future experiments with low current shunt regulators for active crossovers.
Well if your on a budget I don't understand why you want to spend all that money. The AD2 does everything you want. Just start to measure and move on if your need develops. Zero cost solution, your welcome.
BTW What do you want to scope in the superreg that needs a diff probe?
When I worked on the design I never felt the need 😎
Jan
When I worked on the design I never felt the need 😎
Jan
in order to make immaculate power supplies for audio i will buy a laboratory anyway. Electronic load Siglent SDL1020X-E is on my way. I dont smoke or drink, and my favourite toys used to be new audio amplifiers and speakers. Once i saw the beauty of self made amps, i will never buy new amp again. So where else can i spend my money and have this much fun ? For spectrum analysis i already have MOTU 826 mk2 + ARTA. And few remaining things like 4 ch 100mhz scope, programmable PSU and 2ch bench DMM with usb logging should close the list for now for less than 3000$. Maybe an multisweep ultrasonic cleaner and electric oven for copper and silver buses annealing.
Don't tell us you're on a budget ;-)
That will be a nicely equipped lab.
Looking forward to your measurements, maybe you can tell us your plans?
For instance, I'm interested in your measurements on the superreg, obviously!
Which differential measurement were you planning on that?
Jan
That will be a nicely equipped lab.
Looking forward to your measurements, maybe you can tell us your plans?
For instance, I'm interested in your measurements on the superreg, obviously!
Which differential measurement were you planning on that?
Jan
You might also consider
Pick and Place machine
Reflow oven for large (10 inch X 10 inch) PCBs
Stereo microscope / USB video microscope
SMD rework station
300 watt noninductive load resistors (4R and 8R)
6.5 digit DMM with true-RMS and four point Kelvin probe features
2 x Lab DC power supplies, >50V and >3A, adjustable voltage and current limit, with meters
Arbitrary waveform / function generator with square wave risetime < 5 nsec and 10V RMS output
Mega328 component tester
I would add a MICSIG scope https://www.batronix.com/shop/oscilloscopes/Micsig-TO1104.html.
(Bought when they were still $ 400).
The nice thing is that it runs on an internal battery and can be worked with a wireless mouse, so can be fully floating.
I use it routinely to measure at 2kV!
Jan
(Bought when they were still $ 400).
The nice thing is that it runs on an internal battery and can be worked with a wireless mouse, so can be fully floating.
I use it routinely to measure at 2kV!
Jan
Mark Johnnson & jan.didden - thanks a lot for suggestions ! That`s what i need !
Mark : after biting my fingers off for a few months, reading about SMD production prototyper,
i tried hand soldering a dozen of exercise smd pcbs down to 0603 caps, with a usb microscope vs forehead lupe 3x and 5x.
I decided i can solder prototypes myself with forehead juweliers lupe 3,5x + good light, soft with good colour accuracy.
For an exact DMM i already use these: https://www.welectron.com/Brymen-BM869s-Multimeter_2 https://www.tme.eu/Document/aa703d3b31d7e20292dd7331fab4a964/BM869.pdf
for miliohm measurements i use DER EE 5000 LCR with Kelvin clips.
and honestly, when it comes to static measurements, i see no point in going under 0,1mV accuracy, considering real world tolerances of resistors, betas in transistors, Vgs off in jfets and so on. At 10uV or uA just the air fluctuating around pcb causes numbers to drift randomly, making these expensive 5 1/2 numer DMM a moot point.
i would appreciate however a multichannel DMM with usb logging, and probably will go for this one:
https://www.batronix.com/versand/multimeter/Siglent-SDM3045X.html - cheap and good enough for the usb and software funcionalities.
unless you convince me it is beneficial to go for higher specs.
SMD rework station of hight quality would be nice, but its not my priority right now. I use cheapest chinese handheld air soldering station with simplest potentiometer regulation, and successfully resoldered ne5534 in soic 8 footprint, as well as smaller chips on cheap smd excercise pcbs. PCBway does minimum 5 pcbs and take orders for smd soldering as well, so no point in manufacturing myself with a machine.
Prototypes i can solder and resolder with my hands.
For high power load, i mounted on a big heat sink 6 resistors each 50W non inductives, from 1 to 20 Ohms, and use them in diffrent series/paralell combinations. I find it too cumbersome though, hence my last buy of 200W electronic load from Siglent. For me a 25kHz load with 2,5A/us is a very important feature for virtually ALL parts of my design.
For PSU i already have two Zhaoxin rxc 305D - 32V 5A in series, as a symmetric +-32V with central "ground". For just 60$ each, they allowed me to get by to my first pcb.
a fully programmable dynamic power supply, i will probably go for this one, when future budget allows: siglent SPD 3303X , 1mV 1mA aacuracy, 4 digit, 220 Watt.
I conciously and after a thoroughful consideration decide for lower power devices, both loads and psu. Price diffrence if roughly 70% higher between 200W and 300W versions.
My endgoal is a 5-way active speaker, with upper 3 speakers on class A amps, and two lower spekaers with current feedback loops. High efficiency speakers.
Nowhere in this design there is a need for 300Watt. Even for the lowest bass, the 200W conservative limit, when used with high efficiency 15 inch subs in boxer config will be enough for every room, and for almost any normal type of music, bar "Bass, i love you" that requires building subs from cellars under the living room.
Its very easy to overspend when buying equipment. I could just as well go to Rhode&Schwarz and ask for flagships ;-)
jan.didden: THANKS A LOT FOR RECOMMENDATION ! Good i didnt order any 400$ diff probe or 500$ 4ch scope. I will have to rethink a lot with your proposition. (i was thinking about building a 5,5V psu for Analog Discovery from a few paralell 9V batteries, and 2 x lm317 cascaded, to achieve smth similar)
any other recommendations welcome! 🙂 As you see, the list of necessities is still long, the "nicer" versions are significantly more expensive, and technically speaking, even Jeff Bezos is on some budget. I appreciate recommendations for budget frendly yet future proof gear from more experienced EEs.
Mark : after biting my fingers off for a few months, reading about SMD production prototyper,
i tried hand soldering a dozen of exercise smd pcbs down to 0603 caps, with a usb microscope vs forehead lupe 3x and 5x.
I decided i can solder prototypes myself with forehead juweliers lupe 3,5x + good light, soft with good colour accuracy.
For an exact DMM i already use these: https://www.welectron.com/Brymen-BM869s-Multimeter_2 https://www.tme.eu/Document/aa703d3b31d7e20292dd7331fab4a964/BM869.pdf
for miliohm measurements i use DER EE 5000 LCR with Kelvin clips.
and honestly, when it comes to static measurements, i see no point in going under 0,1mV accuracy, considering real world tolerances of resistors, betas in transistors, Vgs off in jfets and so on. At 10uV or uA just the air fluctuating around pcb causes numbers to drift randomly, making these expensive 5 1/2 numer DMM a moot point.
i would appreciate however a multichannel DMM with usb logging, and probably will go for this one:
https://www.batronix.com/versand/multimeter/Siglent-SDM3045X.html - cheap and good enough for the usb and software funcionalities.
unless you convince me it is beneficial to go for higher specs.
SMD rework station of hight quality would be nice, but its not my priority right now. I use cheapest chinese handheld air soldering station with simplest potentiometer regulation, and successfully resoldered ne5534 in soic 8 footprint, as well as smaller chips on cheap smd excercise pcbs. PCBway does minimum 5 pcbs and take orders for smd soldering as well, so no point in manufacturing myself with a machine.
Prototypes i can solder and resolder with my hands.
For high power load, i mounted on a big heat sink 6 resistors each 50W non inductives, from 1 to 20 Ohms, and use them in diffrent series/paralell combinations. I find it too cumbersome though, hence my last buy of 200W electronic load from Siglent. For me a 25kHz load with 2,5A/us is a very important feature for virtually ALL parts of my design.
For PSU i already have two Zhaoxin rxc 305D - 32V 5A in series, as a symmetric +-32V with central "ground". For just 60$ each, they allowed me to get by to my first pcb.
a fully programmable dynamic power supply, i will probably go for this one, when future budget allows: siglent SPD 3303X , 1mV 1mA aacuracy, 4 digit, 220 Watt.
I conciously and after a thoroughful consideration decide for lower power devices, both loads and psu. Price diffrence if roughly 70% higher between 200W and 300W versions.
My endgoal is a 5-way active speaker, with upper 3 speakers on class A amps, and two lower spekaers with current feedback loops. High efficiency speakers.
Nowhere in this design there is a need for 300Watt. Even for the lowest bass, the 200W conservative limit, when used with high efficiency 15 inch subs in boxer config will be enough for every room, and for almost any normal type of music, bar "Bass, i love you" that requires building subs from cellars under the living room.
Its very easy to overspend when buying equipment. I could just as well go to Rhode&Schwarz and ask for flagships ;-)
jan.didden: THANKS A LOT FOR RECOMMENDATION ! Good i didnt order any 400$ diff probe or 500$ 4ch scope. I will have to rethink a lot with your proposition. (i was thinking about building a 5,5V psu for Analog Discovery from a few paralell 9V batteries, and 2 x lm317 cascaded, to achieve smth similar)
any other recommendations welcome! 🙂 As you see, the list of necessities is still long, the "nicer" versions are significantly more expensive, and technically speaking, even Jeff Bezos is on some budget. I appreciate recommendations for budget frendly yet future proof gear from more experienced EEs.
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If you are interested in flaoting USB-connected equipment you need this:
https://intona.eu/en/products/7055-c#features
Jan
https://intona.eu/en/products/7055-c#features
Jan
phew, almost 400$ for a 5,5V power supply ? Just to make my Analog Discovery 2 floating? whoa. I would rather go for this awesome handheld 4ch 100Mhz scope you showed me post before. I could use it at work as well, or on the route . I work as a world travelling service technician for production lines, as an electrician with PLC programming. I can afford "some" lab when buying cautiously. I have some cheap chinese PCB from ebay for my Chord Mojo, that was supposed to do the galvanic separation, but it doesnt help my AD2 so seems to be fake.
i thought also, that if i put a 500VA safety trafo before extension cord to my laptop and AD2, i would float my whole PC and scope at once for much much less, i.e. 70$
i thought also, that if i put a 500VA safety trafo before extension cord to my laptop and AD2, i would float my whole PC and scope at once for much much less, i.e. 70$
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I guess you mean 100M(ega)Hz not m(illi)hz. Anyway.
But I still have no idea what you want to measure differentially on a superreg.
Do you?
Jan
But I still have no idea what you want to measure differentially on a superreg.
Do you?
Jan
No, I don`t. I`m not an EE, i`m just self learning enthusiast. I need to be able to measure throughout, from single transistors beta linearity, to finding the source of oscillations.
Also, while building my synchronours mosfet bridge, i had my hands too close to live 230VAC too many times during measurements (1 dmm is NOT enough), and thought, i need a safety trafo anyway, as i have seen faulty RCDs while installation testing in factories.
70$ worth of copper in a 500VA safety trafo under the table doesnt ruin me yet, and offers interesting possibilities.
Also, while building my synchronours mosfet bridge, i had my hands too close to live 230VAC too many times during measurements (1 dmm is NOT enough), and thought, i need a safety trafo anyway, as i have seen faulty RCDs while installation testing in factories.
70$ worth of copper in a 500VA safety trafo under the table doesnt ruin me yet, and offers interesting possibilities.
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after consideration, i like more and more this DMM:
https://www.siglent.eu/product/1141...-5-1-2-digits-dual-display-digital-multimeter
20 Channels with extension card, for production automated multipoint testing . For such price ! wow. They bought me. I With usb software I could simultaneously see on 27 inch 4k screen 6 channels of current, and 14 other of anything, DCV, ACV, DCI, ACI, R, C, diode, you name it.
I`d prefer to optimize the voltage drops throughout all the filters, if i go for high current class A amps.
Filters: DC blocker, CLCLC high voltage side before trafo, synchro bridge (snubbed if neccesary, i.e. GaN mosfets still have some C), CRCLCRC before Superreg (I am considering a cascaded high current tansistor boosteds LM317s too, or just go for fully cascoded two Superregs).
I still have a gut feeling though, that best investement will be 6x360uF ultra low impedance smd hybrid alu caps just at the leg of Superreg input transistor. Not for smoothing, but for sheer Joules gathered as close as possible. At the amplifier a Superreg want to see a small crappy high resistance electrolite in the 200mA version. Mine must deal with 0 to 3,6 A swings though, and i need to be SURE what cap bank brings best stability on the 20-25kHz sweep.
I dont`t like those general recommendations for voltage drops on filter stages. I need to see it ands hear it myself, once the square waves look perfect, and both op amps and all transistors work comfortably in the most linear range of current in their A biases.
https://www.siglent.eu/product/1141...-5-1-2-digits-dual-display-digital-multimeter
20 Channels with extension card, for production automated multipoint testing . For such price ! wow. They bought me. I With usb software I could simultaneously see on 27 inch 4k screen 6 channels of current, and 14 other of anything, DCV, ACV, DCI, ACI, R, C, diode, you name it.
I`d prefer to optimize the voltage drops throughout all the filters, if i go for high current class A amps.
Filters: DC blocker, CLCLC high voltage side before trafo, synchro bridge (snubbed if neccesary, i.e. GaN mosfets still have some C), CRCLCRC before Superreg (I am considering a cascaded high current tansistor boosteds LM317s too, or just go for fully cascoded two Superregs).
I still have a gut feeling though, that best investement will be 6x360uF ultra low impedance smd hybrid alu caps just at the leg of Superreg input transistor. Not for smoothing, but for sheer Joules gathered as close as possible. At the amplifier a Superreg want to see a small crappy high resistance electrolite in the 200mA version. Mine must deal with 0 to 3,6 A swings though, and i need to be SURE what cap bank brings best stability on the 20-25kHz sweep.
I dont`t like those general recommendations for voltage drops on filter stages. I need to see it ands hear it myself, once the square waves look perfect, and both op amps and all transistors work comfortably in the most linear range of current in their A biases.
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