I also really like the frequency fine tune in the menu which lets you adjust its output frequency to be more m from factory it is at 50% adjustment, I adjusted mine to 58% to get it almost bang on frequency, unfortunately though this adjustment doesn't have an effect on the frequency counter input, that seems to be a seperate reference (or is not software tied to the fine tuning).
The step size is dependant upon the output frequency, it is obviously a scaling factor/divisor rather than an offset adjustment, in my case it was only -12Hz off at 80MHz when set to 58.
Maybe those that have these can do some tests that show the waveform spectral purity
Maybe those that have these can do some tests that show the waveform spectral purity
Here is spectrum measurement for sine 7 kHz 4 Vpp captured with PC sound card "line in" input at 192 kHz sample rate.
Main spectrum window RBW = 0.7 Hz.
The first picture is background noise of installation (sound card + cable connected to PSG9080, PSG9080 is physically disconnected from mains).
(Attachment Link)
The second picture is 96 kHz span with second harmonic in the receiver bandwidth (2.7 kHz).
(Attachment Link)
The third picture is zoom with first harmonic in the receiver bandwidth (2.7 kHz).
(Attachment Link)
when it comes to user interface and functionality
It has external power supply connector 5V 3A, so it can be powered from external linear power supply. External power supply can improve performance.
As far as I know, the maximum output frequency of DG811 is 10MHz, the sampling rate is 125Msa/S, and there is no programmable function, which can realize automatic output. I found that PSG9080 is grounded during use, which is safer to use. PSG9080 dual-channel maximum output is 80MHz. This price is quite cost-effective. If the requirements for AWG are not high, you can also consider JDS6600. I have a JDS6600 that has been working stably for 2 years. It works very well.
Do you hear capacitor noise when the device is off and the device is plugged in?
The BNC sockets are not fixed, can't they take the devices of good brands as an example?
Thanks @radiolistener for the teardown and the tests. Considering the price, this "Junktek" thing is really disappointing. Cheap as cheap can...
No dedicated sample memory, R-2R discrete D/A converter, (probably) marginal reconstruction filtering and no shielding at all. The power supply , especially the transformer, doesn't look too trustworthy regarding creepage distances, and performance-wise, -40dBc for the second harmonic is really less than stellar!
This generator may be okay-ish for hobby applications, but if I had to spend 170+ EUR plus possibly import VAT/taxes, I'ld rather spend 60 EUR more (all taxes included) and get Rigol's DG811 and hack it. Despite the size and the toy-like appearance, this will get you a much more mature instrument which can be considered to be the entry into the professional segment. Have a look here for a set of teardown photos (https://www.eevblog.com/forum/testgear/new-rigol-16-bit-function-generators-dg800900-series/msg2419773/#msg2419773) of my DG811. It becomes directly obvious that this generator plays in a different league.
If you don't want to spend that kind of money, the Feeltech generators are available for about half the money that the Junktek will set you back, and are pretty well characterized on this forum and, as the common opinion goes, are pretty useful as an entry level hobby AWG (with a mod applied or two...).
Just looked at some US sellers of this fine instrument...over $200??? This thing is really a piece of junk. Might be worth $50. My recommendation to anyone looking at these is save your money and get an actual good quality signal generator from a reputable brand.
Just looked at some US sellers of this fine instrument...over $200??? This thing is really a piece of junk. Might be worth $50. My recommendation to anyone looking at these is save your money and get an actual good quality signal generator from a reputable brand.
What are you basing this revelation on? have you even used one, or seen one in person ?
I have used one, and I like it, it is a LOT better than some of the others I have tried, and for the money I actually think it is pretty good, it isn't just a function generator, or an ARB, but a SIGNAL GENERATOR.
Not everyone can afford a Keysight, or Rohde & Schwarz etc. that is why there are difference classes of instrument to suit different budgets, for the price class this is in it is excellent.
It would be interesting to see what a full amplitude 100KHz sine wave looks like in detail at the half and quarter amplitude points. :)
This generator may be okay-ish for hobby applications, but if I had to spend 170+ EUR plus possibly import VAT/taxes, I'ld rather spend 60 EUR more (all taxes included) and get Rigol's DG811 and hack it. Despite the size and the toy-like appearance, this will get you a much more mature instrument which can be considered to be the entry into the professional segment. Have a look here for a set of teardown photos (https://www.eevblog.com/forum/testgear/new-rigol-16-bit-function-generators-dg800900-series/msg2419773/#msg2419773) of my DG811. It becomes directly obvious that this generator plays in a different league.yes indeed different league... your DG811 is 20MHz @ $300. this Juntek is 80MHz @ $200... i guess to make apple to apple comparison with Juntek (or UTG962), Rigol DG4062 60MHz AWG ($800+) is better suited, imho...
can you recommend a good brand name that can go 60-80MHz at ~$200?
Just looked at some US sellers of this fine instrument...over $200??? This thing is really a piece of junk. Might be worth $50. My recommendation to anyone looking at these is save your money and get an actual good quality signal generator from a reputable brand.
What are you basing this revelation on? have you even used one, or seen one in person ?
I have used one, and I like it, it is a LOT better than some of the others I have tried, and for the money I actually think it is pretty good, it isn't just a function generator, or an ARB, but a SIGNAL GENERATOR.
Not everyone can afford a Keysight, or Rohde & Schwarz etc. that is why there are difference classes of instrument to suit different budgets, for the price class this is in it is excellent.
I once had something very similar, and it was a total piece of crap that ended up croaking for no obvious reason (probably the shitty SMPS, not worth fixing). It's not even heavy enough to be a door stop. Notice that I didn't exclude Rigol or Siglent equipment. There also used.
yes indeed different league... your DG811 is 20MHz @ $300. this Juntek is 80MHz @ $200... i guess to make apple to apple comparison with Juntek (or UTG962), Rigol DG4062 60MHz AWG ($800+) is better suited, imho...
...
how far can you hack that 125MSa/s device? i dont follow the hack thread sorry. i assume to the max 62.5MHz? do you call 2 points per cycle distortion free pro/business grade? not mentioning the other fun stuffs such as freq resolution when you go near that limit... enlighten me please.yes indeed different league... your DG811 is 20MHz @ $300. this Juntek is 80MHz @ $200... i guess to make apple to apple comparison with Juntek (or UTG962), Rigol DG4062 60MHz AWG ($800+) is better suited, imho...Sure. If you will use it as-is. I know of few to none private users or small businesses who won't consider hacking. Sorry, but IMO your point is ridiculous.
The DG811 can be hacked to full DG992well unfortunately.. its not easily available for sale anymore (ebay)...
The DG811 can be hacked to full DG992well unfortunately.. its not easily available for sale anymore (ebay)...
UTG962/932 is newly released sale is not stable yet i guess it sometime come and go... but checking, its currently available in aliexpress (china market, where else?) and many sellers start to selling it there, one is $139 https://de.aliexpress.com/item/4000573960327.html?spm=a2g0o.productlist.0.0.5d833d05WH9iPe&algo_pvid=9a579168-5b1e-4282-88f2-d993b612bae3&algo_expid=9a579168-5b1e-4282-88f2-d993b612bae3-1&btsid=0bb0623016012863212357791e36d5&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ (https://de.aliexpress.com/item/4000573960327.html?spm=a2g0o.productlist.0.0.5d833d05WH9iPe&algo_pvid=9a579168-5b1e-4282-88f2-d993b612bae3&algo_expid=9a579168-5b1e-4282-88f2-d993b612bae3-1&btsid=0bb0623016012863212357791e36d5&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_)Really? In Europe, several T/M gear distributors (https://www.batronix.com/shop/waveform-generator/Rigol-DG811.html) have stock available. Btw, once again, the 125MSa/s specified on the linked page is wrong. All these units sample at 250MSa/s.The DG811 can be hacked to full DG992well unfortunately.. its not easily available for sale anymore (ebay)...
Or did you mean to refer to the UTG962 which really appears to be difficult to find meanwhile?
Hi. I received this generator today. The speaker is very loud, sealed it with tape, now it sounds much better.
What is the best way to remove the gray bumper, as it interferes with placing the device on the shelf.
Unless I'm missing something, this doesn't have a 50ohm output. The voltage only lines up with the scope on a 1M input impedance.
A few have mentioned that the frequency fine tune doesnt work with the frequency counter... I find that it does but just doesnt align with the generator section!
Hardware 1.20
Firmware 1.20
FPGA 1.20
Frequency counter sensitivity is low BUT it can also handle 20Vpp according to the manual! - be careful with this one!
A few have mentioned that the frequency fine tune doesnt work with the frequency counter... I find that it does but just doesnt align with the generator section!
what is your firmware/fpga versions?
My one:QuoteHardware 1.20
Firmware 1.20
FPGA 1.20
I have just noticed on mine that channel 1 output becomes VERY noisy when i turn on modulation. May have to send it back
Anyway i have only had it a week or so, im not going to open it up and fix it unless i have to..
It has external power supply connector 5V 3A, so it can be powered from external linear power supply. External power supply can improve performance.
That's an interesting feature, one could power this from an external battery pack for portable use, however I doubt that an external PS will improved the output signal quality, easy enough to verify tho.
Best,
Can the PSG9080 do (constant frequency) AM and frequency sweep at the same time?
Also I have another question about this generator - can I use it for getting amplitude-frequency response diagrams ? I saw sweep mode but can't synchronize gen output with "in X" on oscilloscope(( Does it really possible with such equipment?
I'm not sure that I need in such construstion in generator right now ......
I also really like the frequency fine tune in the menu which lets you adjust its output frequency to be more m from factory it is at 50% adjustment, I adjusted mine to 58% to get it almost bang on frequency, unfortunately though this adjustment doesn't have an effect on the frequency counter input, that seems to be a seperate reference (or is not software tied to the fine tuning).
yes, I also notice that frequency fine tune doesn't affect frequency meter.
Here is actual frequency output on my unit for 50 MHz setting and different frequency fine tuning value:
- 49.999713 MHz for setting 49
- 49.999765 MHz for setting 50 (default)
- 49.999817 MHz for setting 51
- 49.999869 MHz for setting 52
- 49.999921 MHz for setting 53
- 49.999973 MHz for setting 54
- 50.000026 MHz for setting 55
- 50.000078 MHz for setting 56
About 52 Hz per unit. 52*50 = ±2600 Hz tune range.
I think it's too high for usual TCXO, it will be better to have about 5 Hz per unit.
Doubt the PSG9080 or most lower cost AWGs can achieve that level of accuracy. Likely require an external reference like a GPS reference for use with the AWGs that have an external reference (10MHz) input.
Think most of the mid-level AWGs from Siglent and Rigol will work with an external GPS reference, I know our SDG2042X works with 10MHz external references although we don't have a specific GPS reference. The higher end AWGs from KS and Tektronix should also work with an external GPS reference.
Best,
Doubt the PSG9080 or most lower cost AWGs can achieve that level of accuracy. Likely require an external reference like a GPS reference for use with the AWGs that have an external reference (10MHz) input.
Think most of the mid-level AWGs from Siglent and Rigol will work with an external GPS reference, I know our SDG2042X works with 10MHz external references although we don't have a specific GPS reference. The higher end AWGs from KS and Tektronix should also work with an external GPS reference.
Best,
Thanks for the tip. I didn't know that GPS reference is so good. That can save me some money.
On another note, in Rigol's DSG800 1.5 GHz spec sheet is says, pg.2 section: "Internal Reference Frequency", that it can deliver "< 5 ppb" frequency accuracy. That's 5 parts-per-billion which I find astonishing. Its just pitty it is out of my price range.
Is < 5 ppb frequency accuracy really common in that price range of AWGs?
https://www.rigol-uk.co.uk/jg/wp-content/uploads/2020/06/Rigol-DSG800-Datasheet.pdf (https://www.rigol-uk.co.uk/jg/wp-content/uploads/2020/06/Rigol-DSG800-Datasheet.pdf)
Does this generator have a sweep sync output signal (see picture)?* sweep_sync.png (92.71 kB, 800x480 - viewed 533 times.)
Hi. I received this generator today. The speaker is very loud, sealed it with tape, now it sounds much better.
What is the best way to remove the gray bumper, as it interferes with placing the device on the shelf.
Please tell me, does this generator have a sweep sync output signal like in your picture?
1. You need a Bluetooth module to plug into the TTL port. Seems to be bundled by some vendors but not Joy-IT or Juntek.
2. AFAIK Vpp is the only way
3. The firmware seems to be v1.2 so no newer than what you probably already have.
2. Is there a way of setting the output voltage in other units than Vpp? I'd much rather use Veff or dB.
3. JOY-IT have a firmware update for 'their' PSG9080 from March 10 on their website (https://joy-it.net/en/products/JT-PSG9080). Unfortunately no further info or version history. Just saying...
PSG9080_ARB.exe COM17 -read 1 wave01.txtPSG9080_ARB.exe COM17 -write 1 wave01.txtPSG9080_ARB.exe COM17 -read16 1 wave01.txtPSG9080_ARB.exe COM17 -write16 1 wave01.txt1. I read that one channel cannot modulate while the other is sweeping. Can one channel generate a basic waveform while the other channel is sweeping?
2. Is there a marker function?
3. The on-line manual shows trigger input and output bnc connectors on the rear, but from what I read here they don't appear to actually be present and the teardown video shows unpopulated points on the circuit board in that location. Are there different versions available? Did anyone get one with trigger I/O ports on the rear? (The JoyIt version also shows these rear panel connectors on the website images).
Are those images of one of the channel outputs, or the strange output from the rear connector?
I just received my PSG9080 and after seeing some odd behavior I decided to update its software... Bad plan; after the update (which itself said all went well) the device is dead: black screen.. I am trying to communicate with the AliExpress shop I got it from to get it back to life but that is... hard.....
It appears the device is updated through a serial connection from the USB port. That serial port is still there, but the thing listening to it seems to be dead.
Has anyone any idea whether I could update the firmware through some other means on that device?
I got the firmware and the update tool from an URL that was posted on Juntek's website and also on the device. It was
http://68.168.132.244/PSG9080%20Firmware%20upgrade.zip (http://68.168.132.244/PSG9080%20Firmware%20upgrade.zip)
The upgrade itself worked without any problem: the software did the update and said that it was a success. The device at that time also told me it was successful and that I needed to restart it by pressing a button. After pressing that button it restarted - and was dead. Dead meaning: black screen, and not even the software power button (the fron one with the blue light) reacts anymore: it stays on regardless of whether it is pressed or not.
My brand for the device is really "JUNTEK".
I hope I used the correct firmware, of course. I did see multiple versions on the nets but the one above was supposed to be the correct one. I also remember seeing that same URL (with the ip address instead of a host name) on the device itself - but I might be wrong there.
A complete power off/on only switches off the blue light in the power button and powering on lets the button burn again. Pressing it does nothing. The screen remains black. Connecting it to the PC makes the PC recognize a serial port, but running the upgrade again reports that the device does not react.
Hi! Could anybody properly install the PC software for this PSG9080? I downloaded both the english and chinese version of the software from the Juntek website, but the zipped english version has CRC error. The CN version can be installed, however it could not register an .ocx controler. I added that .ocx file to the Windows and I registered it manually, so the software now can be run (an error message still show, but it can be okayed). Unfortunatelly, it does not show any text on the GUI, only the different values (frequency, amplitude, phase, etc.) can be set (if you know that what are you setting actually...).
Two days ago arrived it, so yesterday night i try everything until 01.30 and today i wake up 6.30 after go work...
Now i find the solution!!!
Changed "decimal symbol" from "," to "." in windows(control panel, region settings, addictional settings, decimal symbol)
Two days ago arrived it, so yesterday night i try everything until 01.30 and today i wake up 6.30 after go work...
Now i find the solution!!!
Changed "decimal symbol" from "," to "." in windows(control panel, region settings, addictional settings, decimal symbol)
for what reason you're needs PC software?
I am not sure that it is the FPGA that is the trouble. To me it sounds odd that you would first do a lot of FPGA work before you would show the splash screen.
Also, the update program ITSELF fails telling "Failed or not responding" immediately. I assume the update is handled by the stm32, so to me it feels like that one is buggered.
PSG9080_ARB COM1I did get a new firmware file from our Chinese friends. This one contains an update ending in 56 78 so it should be an mcu update. But it cannot be placed due to the firmware upgrade issue.
0-256okh.binThere is an empty socket for a pin header on the display board; any idea whether that would be a jtag thing? Or is there any other way I could get that stm32 into boot loader mode or something similar?
I tried to connect to STM32 through JTAG but it didn't respond, so this is a sign that the controller is protected from firmware download. I'm not sure for 100%, because I just leaned pins to a JTAG header for a test, so may be it fails to connect due to a bad contact. But I don't see the reason why manufacturer can leave firmware open for download, because it will allows to clone device and Chinese guys obsessed with protecting against it.Ah, I was planning to trace those today and solder a header on it. I suppose I can still try, it cannot really hurt.
It looks that you run MCU update with a wrong firmware. Can you please share firmware file which you used for update?Well, I'm pretty sure it was the correct one. But you might be right; it not really possible to check.
I was sent firmware by the shop that differs from the JOY-IT firmware, and it does end in 5678. So the hope would be that this is the MCU software for this device. It is hard to say because there is no recognisable data in the file; it looks to be either compressed or encrypted. I've added in the attachment, perhaps you might find it of use.
But I never seen this firmware update on Juntek site... What seller said about it?Well, the seller tells me he is in communication with Juntek about the issue, and after sending me the same (FPGA) update a few times I was able to make him understand that that update really did not work. So then he came with this one a few days after.
So, by itself I seem to have both an FPGA update file AND a MCU update file. I just do not have any way to get them where they belong..
You told me you traced the mcu jtag pins; do you happen to remember the pinout? I did trace it to the pins on the unmarked chip but I cannot make much sense of it; I see most of the pins go to pins on the chip that seem to be unrelated to jtag..
can you share all firmware files provided by seller?Well, the other one is the one widely available, with the 0-256okh.bin file.
I traced JTAG connector for a front panel board with STM32 controller (with display and buttons).Can you tell me what you found? Because I could not really connect the pinout with the assumed stm32f103rct6. The pins I traced do not seem to go to jtag pins.
Can you tell me what you found? Because I could not really connect the pinout with the assumed stm32f103rct6. The pins I traced do not seem to go to jtag pins.
I didn't save my results, but as I remember this connector has +3.3V, GND, SWDIO, SWCLK and RESET. I trace it with DMM on STM32 pins, but I don't remember exact pin description. 3.3V and GND you can easily find. SWDIO and SWCLK can be traced with DMM.Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
I didn't save my results, but as I remember this connector has +3.3V, GND, SWDIO, SWCLK and RESET. I trace it with DMM on STM32 pins, but I don't remember exact pin description. 3.3V and GND you can easily find. SWDIO and SWCLK can be traced with DMM.Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND
With the exception of the power lines all of this seems nonsense. But then I looked up your teardown images and lo and behold: I think I have a different version. My board looks like the image attached. The chip's markings have been erased, but clearly the pinout is quite different.
So, I fear I need to go on the hunt for what chip this is before I can do anything....
Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND
With the exception of the power lines all of this seems nonsense. But then I looked up your teardown images and lo and behold: I think I have a different version. My board looks like the image attached. The chip's markings have been erased, but clearly the pinout is quite different.
1) Duty cycle don't works properly for the frequency 1'000'000 Hz and above. If you set 999'999 Hz or below that it works ok. But when you set frequency just 1 Hz above, the duty cycle setting is no more works as expected. This is obviously firmware bug, probably just some kind of mistyping in the source code or something like that. But be aware, with current FPGA firmware 1.20 you will be unable to setup duty cycle for the frequency 1 MHz and above. You can setup duty cycle for higher frequency on the display UI, but the actual signal output will be invalid. It stays close to 50% for any setting from 0 to 99.99%, but it is not exactly 50%, the actual duty cycle changes for about 2-5% instead of 0-100%.
Hello radiolistener, has this problem been solved? I was thinking about buying this generator, but after reading this I suspended my purchase. I usually use square wave above 1 MHZ with variable duty cycle to test some sensors and stuff.
The PC software on the Juntek website is corrupted and has a virus. Is there another site where I can download it? I need the software to create and add other waveforms that don't exist on this device.
I'm using the FY6800 at the moment. In your experience how does the PSG9080 compares to FY6800?
No. It needs to update firmware in order to test if this bug was fixed in a new firmware. But I'm afraid to do it, because it may brick device and I don't have backup file to restore it. One people already reported that he bricked his device with firmware update. Therefore I am afraid to try firmware update without backup file for JTAG programmer.
Yes, the virustotal reports a virus for software from official site. But actually it doesn't needs. I tested it in isolated virtual environment (for safety purposes against viruses) and found that official software just allows to control signal generator from PC.
The only feature that is really needed is ability to download and upload arbitrary waveforms.
So, I created a small command line tool which allows to download and upload arbitrary waveform with no needs to install software. It is available on github, include source code:
https://github.com/qrp73/PSG9080_ARB
and works very well. It allows to upload and download waveform in two formats:
- 14-bit format (waveform is uploaded and downloaded from device as is, with no conversion), this is default format for my tool
- 16-bit format (it needs to convert data from 16-bit to 14-bit before upload), this format is used by official software
The conversion 16 to 14 bit which is used in official software may be unwanted if you want better control on precision of the waveform data, because 16 to 14 bit conversion is lossy and you may want to control how this loss should be done. This is why I added support for 16 bit format just for compatibility with files taken from original software. By default my tool works with 14 bit format and upload data into device as is with no conversion, so you can take full control on waveform data. But you can still use 16 bit format files to use waveform files taken from original software. It is possible by using specific command line options.
My tool doesn't have graphical editor, because I'm too lazy to do it. This is just a command line tool, it allows to download arbitrary waveform from PSG9080 into file on your PC or upload arbitrary waveform from file on your PC into PSG9080 and that's it.
The file format is pretty easy, this is just a text file with decimal unsigned values separated by new line separator. It consists of 8192 lines (8192 points) with values from 0 to 16383. You can create such file with MATLAB, R or other software.
You can use this command line tool from windows, linux or mac-os.
For linux and mac-os just install mono package and start the exe file with mono.
I don't have FY6800, so I cannot compare. At a glance, PSG9080 has more clean and stable waveform, because I was seen worse signal from other users with FY6800.
Also PSG9080 has very nice front panel with large display and nice buttons. So, if your eyes vision is not perfect, it's better to use PSG9080, because it has more large text on display.
That's what I was afraid of. So the seller was trying to deceive me when they said "there's no such problem".
but tell me how do you draw the waveforms?
I don't paint it, because it is not precise method. I just write my own code to generate it from a function or script. The same you can use MATLAB, R, python or other language to do that. You can also plot the waveform from a file in such way.
Correct PSG9080 it's better than fy6800 cleaner waveform from what I saw in video reviews, apart from jitter, amplitude stability and wave distortion was solved by using a linear power supply made from a old transformer and some 7812, 7912 and 7805 linear regulators.
I find out who manufactures PG9080, Hangzhou Junce Instruments Co., and did you know they are releasing a new brand name for their FG? ready? JunCtek :palm: This chinese guys don't realise what words can do to a product :-DD
I'm running my 9080 with an external linear PSU connected to the 5 V DC input. Its built-in PSU injects far too much noise back into the mains.
In case it's of interest to readers:
There's a Koolertron CJDS98 which appears to be the same as this Juntek 9080.
If you download the zip file software and docs package pointed to by the Koolertron vendor on amazon.com, it contains a manual titled PSG9080, and showing a picture of the Juntek.
Of course "same" is relative, as there could well be hardware and firmware variations.
>Quote from: ptluis on 2021-10-14, 06:38:23 (https://www.eevblog.com/forum/index.php?topic=248522.msg3746269#msg3746269)Correct PSG9080 it's better than fy6800 cleaner waveform from what I saw in video reviews, apart from jitter, amplitude stability and wave distortion was solved by using a linear power supply made from a old transformer and some 7812, 7912 and 7805 linear regulators.
I'm running my 9080 with an external linear PSU connected to the 5 V DC input. Its built-in PSU injects far too much noise back into the mains.
module or just power it from external 5V / 2A PSU. You can power it from USB power bank.
So I did a little research, an audio quality Ultra Low Noise linear power supply will easily swing over $100 (think with professional grade mechanical modifications). It is a question of whether this investment is worth it and whether an ordinary linear source with slightly better filtering will suffice.
Note that there is DC/DC step-up converter to get bipolar power for output amplifiers.The switching power supply replacement project was suspended for this reason. The DC/DC converter will likely be retained for the 5V external power option, but the power supply will be reworked to be linear when powered from the mains.
How does this look to you?
Allthough it does not answer my question, it is still a good suggestion. ;DHow does this look to you?
I added a plastic washer under that screw on mine.
Allthough it does not answer my question, it is still a good suggestion. ;D
I've seen a lot worse, and on significantly more expensive equipment.