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btw PIC and TI have several AP's on this.

I am BLIND again, it is done all analog! Open your eyes Steven! :)

No, the Regulation is Analog, the MCU is not in the Regulation Path

I have a KORAD copy brand PSU, so I might try this in the future (far future - health issues), just for fun! :)

I just noticed that they are using 3 x 74HC595's, so a smarter idea would be to use a MCU serial in port ad do away with ALL THOSE WIRES! Feel dumb for not noticing! :(

This would of course require VERY careful MCU selection to make the serial in work properly.

Hi Joseph, did you finished it ? what are the Specs of your PSU ?

@@KonstantinGrigoriadis I just made it to the breadboard stage before finding one of the 150 watt inverters like you had in the video. Mine was TL494 based, But I was having trouble finding fast rectifiers for the voltage I was making. 1N4005 diodes worked, but would heat up. The 150 watt inverters had the rectifiers, so a little good filtering and I was set. My amplifiers are low powered so I barely loaded the PSU.

Hi Joseph, the 1N4xxx are to slow(trr Recovery time) that's why they heat up, you need Ultrafast ones like the UF4007 (NOT 1N4007) are for 1kV 1A 75nS rectifiers. I use UF5408 same Ultrafast 75nS but for 3A for Currents less that 1A and Through-hole. The onboard one are ok but not for 100-150W. Cheers, Konstantin

@@KonstantinGrigoriadis I finally bought some from amazon, but by then was using the 150 watt inverters. I make these audio amplifiers from strange parts.. I have used horizontal output tubes as finals. I was driving thermostat transformers as output transformers. They are 480vac to 24 vac. and I used neon lamps as voltage regulator for the screen voltage. Oddly enough, it sounded wonderful. It makes approximately 3.5 watts per channel.

Sounds like a interesting project! How are the inverters performing noise-wise ?

The sense on the cs pin is to limit the current cycle by cycle as a part of the Regulation, the sensing via the 393 is used to Shut it complete down in a ocp situation like a crowbar, donno why they did it so, its redundant .

@@KonstantinGrigoriadis Oh really! :) Of course they, and I and once again spoke too soon and failed to engage my brain!.

Donno Why they left it out

@@KonstantinGrigoriadis CHEAP BASTARDS, that is why :) I have no idea, and although trivial, I still would love to know, as even back then slope compensation was very well known.

Hi Steven, you can use the TL598 instead that has PushPull outputs and some more feautures, but unfortunately it's not 1:1 pin Cpmpatible. Cheers, Konstantin

@@KonstantinGrigoriadis Yeah, but I cannot get it for pennies like I can but fake TL494's on AliExpress! :) Seriously, it is expensive, way more that other BETTER chips sadly, otherwise I would have hundreds in stock like I have the TL494. ...not fakes! :)

Hello, Thankyou, I do custom projects, but not at the moment bcs to many in the queue . Cheers, Konstantin

Btw. you can always contact me via my Email, that is in the Description Tab of my Channel.

@@KonstantinGrigoriadis I don't see an email there that's why I am asking. And I am not really in a hurry, just thought you are perhaps a good match for what I might need, so I am willing to wait...

Hi Alessandro, Thankyou! The Tl494 is not TotemPole it has Diccrete Transistor Outputs. The TL598 is a 1:1 replacement with a TotemPole Output that is a lot Better but still ancient. For new Designs for PushPull and Half/Full Bridge I would use the UCC3808 series From TI, even though more restricted in means of Error Amplifiers , but with a Cycle by Cycle Current Limmiting. Cheers, Konstantin

Hi Bjorn, Thankyou ! Yes replace the 2 caps with 450 or 550 V ones for peace of mind. Cheers, Konstantin

Thankyou!

Hi Yes I realised the misnaming at the moment I said it :-) but I couldn’t remember the Brand even that I use it a lot, I get them from lcsc. Cheers, Konstantin

Hi, search on ali for „500w inverter board“ cheers, Konstantin

:-) Yes because always Unikates are created so, I want to make designs repeatable and as easy as possible.

Thankyou Dave !

Hello Thankyou, this depends on how good the Transformer is Designed and Build, how good the Mosfets are matched (RDS ON) and the DeatTime . Otherwise it could lead to transformer saturation.

Thats the thing - nobody bothers with flux balancing, you'll need proper peak or average current control for that.

Giasou Thoma, Thankyou! 1) I have done that already (I dismantle everything 🙂) and the Isolation was ok 2 layers of Tape Between between Pri/Sec in more layers, no overlapping Pri/sec without tape. Please condider, that in this Design we do NOT Deal with Mains Reference or Rectified Mains, what would make it Safety Critical, its an PushPull from 12V! Even if something goes wrong (Short Pri/Sec), the Primary Circuitry will fail(Destroyed) and that's it! I no see any elevated Safety issues here except at the working end of the PSU (High Voltage)! Further these Transformers are used in the Majority of the Commercial low-cost CN Inverters ! 2) Regarding CU coated AL, well that's how it is, again in the Majority of the Asian Magnetics used even in Brand name PC PSU's, this is something we have to live with. Expecting for that Price a pure copper Magnetic is probably illusion. Further this is NOT a commercial Design. Cheers, Konstantin

Hi Luc, Thankyou very much and Greetings from Vienna/Austria! You say "WE" , you mean more of your friends watch my Videos ? Cheers from a little to warm Vienna :-)

Thankyou !

Hi Anatoly, Thankyou! Yes as I said its some Work necessary to get these Modules output "Cleaner". I would be interested to see how the 10uf Stack of Ceramics look ! What additional LC Filtering element you men/use ? My Email is in the Channel Description Tab. Cheers, Konstantin

Its really nice made

Hi Richard, well all modern professional(not Amateur) Power RF TX / RX are using Switchmode PSU's, Today even in medicine where its dealed with nV, SMPS's are used, of course correctly designed ones.

Hello, The Frequency is specified by the used Transducer, to change Frequency the transducer has to be changed the L2 Inductor and the T1 & T2 need to be recalculated eventually.

Thank you sir, I've been playing around with ZVS driver now for a couple of years now powering CRT transformer for fun. So yes I have 100khz transducer and was wondering if lt spice is a good software to simulate the circuitry if I plan on rewinding the torroid, the choke and the pulse transformer.

Hello, LTSPICE it just a Simulation Software, yes you can use it to Simulate the Results of your changes.

Thankyou, btw, I have Tinnitus too, Cheers, Konstantin

Danke !

Hi Richard, Thankyou!

Hi Robert, KORAD is the manufacturer of those psu’s, you will see them under many different OEM names, they are basically the same, unless that some OEM habe requested slightly differences.(specs and usage Eventually) .

Hello, I dont understand what you mean ?

@@KonstantinGrigoriadis i mean the high voltage side can make the AM transmitter at 200khz and harmonic at 600khz

And what would that be of use ? There is no necessity of an antenna the sparks are distorting all over the am band.

@@KonstantinGrigoriadis wow that's so great, i try to protect my car with a jammer. Thank sir for your vidz

Hi Bjorn :-) No, the Power Rails is clean and the MCU Generates the Sweep on purpose (that's the only reason to use a MCU), perhaps to cover a wide range of Coils that van be used. Cheers, Konstantin

Hello, Thankyou ! Well, it would make no sense and it looks different, I didn't analyzed it though , cheers, Konstantin

Hi Dave, about continuous operation, it depends what current y lamp draws and if the modules are powered with 12-15v only, what are the specs of your lamp ?

Hi Luc, Greetings from Austria/Vienna

Hi, Yes, the Humming of the Low Freq Transformer is missing, like in the Frankenstein Movies :-)

Hello, unfortunately, I do not know!

Hi Darren, Thankyou! The Modules of the Video are just the HV Flyback Converters for the Future Cap Leakage Design which will be MCU based and display both Set Voltage and Leakage at the Set Voltage on a LCD Display. The Cap Leakage Tester will have switchable: 1) a 12 Pos Switch forming a Voltage Divider String for standard High Voltages 2) a 10Turn Pot to set the High Voltage Freely 2) a 12 Pos Switch forming a Voltage Divider String for standard Low Voltages < 50V or so Cheers, Konstantin

@@KonstantinGrigoriadis I look forward to the finished design. It is something that I have wanted to build for a long time.

Which one ? My Version of the hv module or the capacitance leakage tester ?

@@KonstantinGrigoriadis My first interrest goes for the hv module. Reusing the parts for a better module with real world specoifications (without the need to cool it down to near zero Kelvin like Ali express does it). I am interested in getting the ripple voltage down to a minimum.

High Tony, the Transformer uses an EFD25/13/9 Core that will deliver Max ca. 20W(according to Magnetics Datasheet), that probably was intended for a Capacitor Charger for Photography Studio Flash(my Assumption :-). The Transformer gets Warm when these max 20W are exceeded and bcs the transformer is probably not designed to work with a duty Cycle more then 50%, which is the case using the UC3843 Chip that goes up to almost 100% Duty. In my Redesign of the Module for the Capacitor Leakage Tester, I will never reach these 20W. The most important is to not exceed those 20 W (the Magnetic Datasheet states it even for less 18W) and to use higher Input Voltage (19-24V Laptop PSU), to keep the Duty Cycle as near as Possible to 50% by using the Whole Secondary Winding instead only the Half ! Cheers, Konstantin

Hi Ruben, the LC lowpass is nessesary , I would suggest additionally a ferrite bead 1000ohm@100Mhz followed by a 10nf HV Ceramic. This Module IS noisy :-)

Yes but with additional Filtering only.

Very good project. I used that module in my own cap leakage tester, but have really not trusted these modules too much 😊

I have used one of these modules for a stereo PCL86 amplifier. 13V for the filament and for the converter. But I don't trust it much. The transformer gets very hot. I think its at the limit it can handle. I disabled the negative rail output on mine: it had less power capability than the positive out, anyway. And when I draw power from the positive out, the negative rail was climbing in voltage as it stayed unloaded, fearing capacitor explosion. I think the transformer could be replaced by a more powerful one from an old smps, but used backwards?? One from a 12v 60+ watts?

Hello, Thankyou, this is why I designed my own Modules using the Transformer and even the Heatsink of the China Modules :-) Cheers, Konstantin

Hello Josep, The Transformer uses an EFD25/13/9 Core that will deliver Max ca. 20W(according to Magnetics Datasheet), that probably was intended for a Capacitor Charger for Photography Studio Flash(my Assumption :-). The Transformer gets Warm when these max 20W are exceeded and bcs the transformer is probably not designed to work with a duty Cycle more then 50%, which is the case using the UC3843 Chip that goes up to almost 100% Duty. In my Design I don't use the CT of the Secondary, I use the Sec in Total. As for more Power, I would make a new Design with a better Transformer made on my specs in China. I don't use Salvaged Transformers that are not available en mass(like the one of the Module, or on other Widely available Modules), bcs this makes it a one of project and I want my Designs repeatable. But for a on off project the salvaged one would do, although UN-optimized and the SMPS from where you use the transformer must be a Flyback one(Laptop PSU for ex.), PC PSU' are mostly HalfBridge Designs or Better. To get 300V and above I would use available (what I will show in a future Video) Aliexpress transformers for PushPull Operation >= 100W. Flyback is noisy, I prefer PushPull for Audio and RF when i need to Power HV equipment from Low Voltage. Cheers, Konstantin

Hello, Thankyou! 1) Are you using the EGS002 in High Voltage & Frequency Mode or in Low Voltage & Low Frequency mode ? 2) if you use it at Low Freq Mode, you use a Iron or Toroid Transformer ? 3) another reason the IRxxx blow can be due to fake or bad quality...(I had that) I only use drivers bought from a reliable source when using it on Low Frequency Mode. Both make a a big difference on how good or bad the Module will work. Yes i used it with China High Frequency Inverter Board, with no Problems. Problems mostly occur with Iron and even more Toroid Transformers in use, but there are some Solutions. Cheers, Konstantin

Thankyou Daisy!

Hello Dave, Thankyou. For the Load you should use IGBT's or Power Mosfets that have a DC SOA shown in the datasheet and stay in this SOA, you will see that even the IGBT can do Pulswise even Kilowatts , in DC its much much much less :-) If you operate these Power devices in Linear DC mode out of their (if exist) SOA they get destroyed very fast! I am using a EUPEC BSM 50 GB 170 DN2 IGBT (the Half of it) for at least 200W (SOA goes Higher even up to 1000V 400mA, 400W total Max). Just for Info :-) Send me an Email to Reply you with the Design Files. Cheers, Konstantin

Hello Stuart, Thankyou! The reason I didn't offered the Design Files already is that, I cannot give Support, bcs to replicate it you need : 1) Fully Working Arduino 1.8.19 IDE environment 2) Solid Programming Know How, and knowledge of the Arduino Environment 3) Good SMD Soldering experience (mostly 0603 and small Pitch SMD Parts) The Design Files consist of 3 Layouts , 2 Schematics, and the Code. If you are ok with the above and the non support possibility, send me a Email for further Info and Design Files.Cheers, Konstantin

@@KonstantinGrigoriadis I am very proficient in all of the above. I def won't bother you for support. What email address should I use. Thank you! 🙏

Hi Stuart, My email is in the Channel Description, Cheers, Konstantin

I forgot, my Email is in the Channel Description Page, Cheers, Konstantin

@@stuartmarinus4810 Hi, I did not received any Email yet for the Design Files, Cheers, Konstantin

Hello Dave, Thankyou!

Hello, there is quite more coding necessary to display all gnss meaningfully on the tft and a different u-blox chip too. The reason I did not do it, is 1) that if the GPS L1 signal is adequate, then L1 reception for Baidu and Galileo is OK too, the GPS satellites are the oldest. 2) the Design is a to be used as an L1 GPS Signal strength meter (with additional Infos). Glonass is on a diff freq but wouldn’t be a problem either. Further via usb the box can be connected to a pc running the ucenter software to show all too. Cheers, Konstantin

Hello Maurizio, please read the Video Description, there I write, that I use SNr for simplicity and that in real it is C/No in dB-Hz. And why the Sum does not make any Sense at all ? Its a relative Value that gives a rough Picture of the Overall Reception Quality, for that the Design is all about, nothing more and it is adequate to check the Overall reception at a specific Spot ! And Btw, even Linux GPSD calls it snr for simplicity!

Hi Jared, Thankyou, the Sum snr of all the used satellites in used for the bargraph to have a more dynamic display and it shows the overall signal strength, only bcs eventually a couple of sats are doing great and all other’s in use are borderline, that does not mean i have the best reception/antenna position cheers , Konstantin

Gotcha, thanks! I had figured that's more or less what it was for, thanks for the confirmation

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