Video

Thankyou and Thankyou :-) yes CopyPaste error.

Hi Bjorn, Thankyou! the 5th pin is not used on then Mainboard of the Scope, it probably can be used to Sense if the CCFL Tube is drawing Current or not anymore. Cheers, Konstantin

Hello, I have it since 2015 and works fine :-)

@@KonstantinGrigoriadis I hope mine lasts just as long. Only using it for voltage injection, finding shorts in macbook logic boards.

Hi Bryan, the EEV CV2427 is the MIL version of the CIV version Mullard - JP9-250C. I doubt you will find anything about the EEV CV2427 other that here : www.ostron.de/Radar-GHz/Bauelemente-bis-SHF/Magnetron-CV2427.html , its in German.Cheers

Thank you! I’ll try to put it through some translators to see if I can understand the basics of it. I appreciate the information.

Contact me via Email if you want to send you the English Version, Cheers

Thanks Bjorn, Cheers

Hello, all are from Aliexpress search for EC42 and EC49, cheers, Konstantin

Hi Jared, Thankyou! I have not made any thoughts yet how many Videos it will in this Series, there will be a video when there is progress, its a general Tube PSU , so not planned any specific Tubes either :-) I will probably use it to power a small 40W Linear Amp with the Tube shown in the Video, the one with 2 top Electrodes (RL12P35) as Part of a Transmitter I call "Frankenmitter" bcs it includes a variety of Technologies of the last 80 Years :-) , Cheers, Konstantin

Hello Tiago, Thankyou for that Info, it makes sense!, Cheers

​@@KonstantinGrigoriadis The frequency variation due to the load is small (a few hundred Hz), but it is enough to take the ceramic out of resonance, causing a significant drop in the transfer of mechanical power. You can visualize this by using a sensing coil (connected to the scope) wrapped around one of the cables of one of those ceramics.

Hi Bjorn, Thankyou! I think they just didn't thought about it with the nuts, bcs the price difference is almost 0. The very thin Stainless Steel Metal Housing is more a cutting Corners. But for that Price with that Specs and the good results I archived at my first amateurish Cleaning, its unbeatable. I am sure the cleaning will be much better by using the suitable Cleaning Solution Mix and a much better Jar :-) Concerning the Relais in US Cleaners, thankyou , I knew it but didn't gave it a thought bcs I never used one before :-). The board I Demo cleaned with the relay was just a keeper (bcs 1st Prototype) from an 2018 larger Project (there have been over 2000 of these boards made for use in Cable-cars in Latin America). I wanted to include the Reverse Engineering of the Powerboards in the same Video, but it would had get too Long. Cheers, Konstantin

@@KonstantinGrigoriadis i have very small no branded ultrasonic cleaner for cleaning my glasses and earrings, in the begin i used the cleaning product that my optical store sold for manual cleaning, this was based on Isopropanol alcohol, but i found the cleaning results not that great and found ultrasonic cleaning was way overrated. But after that i used regular dish soap, and that gave very clean glasses with no stripes att all and i was very surprised. So you can try that as well. Also the jar is a good practice, otherwise you have to replace lots of cleaning liquid. Wit a jar of zip lock bag, the surrounding water on the outside is only used as a "conductor" for the ultrasonic waves. Grtz

​@@BjornV78The Liquid I used to clean the PCB's is Soap Based, well not so great for Hardened Rosin Flux, I used it bcs the one I ordered to try for PCB's, hadn't arrived yet. I made the smaller Yellow PCB's extra Crunchy to see what the Results would be:-) The guy that soldered the Green one used water soluble Flux, that was easy. As for the Jar, yes, thats why i did it, bit not sure if the Jar I used (Hard Thicker Plastic, was all I had 🙂) was the best solution, Perhaps Glass or Tupperware Plastic would have been better. Cheers.

Thankyou!

Thankyou!

? Its Fully Voltage and Current regulated ! Voltage Feedback goes to Pin 1 and Current Feedback goes to Pin 15 of the TL494... Through Circuitry of course

@@KonstantinGrigoriadis well i didnt see another FB winding or an optocoupler and that got me a bit confused...

​@@sanjikaneki6226 :-) the Regulation Circuity is Secondary referenced bcs it uses Isolated Gate Driving, a GDT(Gate Drive Transformer), If the Drivers would not be Isolated then Optocoupler Isolation would be used. No Feedback / Auxiliary windings, are mostly used in Offline Flyback Converters and these are to Power the Controller Chip also.

Hello, All the Aluminum Cases I Showed in the Video are from Ali Express, only the Big Plastic one is from a Local Supplier.

Hello, Compensation is done for the Primary Output, this Isolated Outputs are interned to power Light Biasing Loads NOT Large Fast Switching ones!

@@KonstantinGrigoriadis thx, i was considering driveing a date driver from it and maybe some op amps that should be light enough , right? then again regulation is not a problem if it goes down a bit

@@sanjikaneki6226 This was more or Less the Reason i Designed it. But be careful with the Gate Driver , if you mean you want to use one of the Isolated Outputs to for the SUPPLY of a Gate Driver, this Depends, what Current the Drivers must Deliver to the Fates of the Power Devices you use! The 4 Isolated Outputs are Designed to deliver Maximum 200-300mA each.

Hi Again, If you use the Design to isolate between Low & High Voltage, use the correct Isolated wire for the Transformer !!! A Normal Lacquer Wire is NOT enough!! See in the Video Description about the Wires that MUST be used when Isolating Low-High Voltages. Cheers, Konstantin

@@KonstantinGrigoriadis In the US the terms to look for on the wire are things like "high voltage" or "600V" or some other voltage rating.

Hello , without the Light Load the The Outputs go Higher when Open (what is expected), what safety Zeners ? for what ? I never seen in ANY FlyBuck or Flyback Design with "Safety" Zeners....

@@KonstantinGrigoriadis You haven't seen my designs :) I usually one just low enough that I don't fry the linear regulator when the isolated output is unloaded.

Hello, Please read the Info in the Description about the Wire to be used :-)

@@KonstantinGrigoriadis Thanks for the info. Also found application note of this. Thanks.

Hello, No Problem, what application note y mean, for the Flybuck ?

Thankyou!

Hello Arve, The Osc Frq of the TL494 is set by Pins5 & 6 (CT,RT), and stays Fix during the whole Operation (except if you put a Pot at Pin 6). Fixed means, that the Frequency cannot be Controlled/Adjusted Dynamically form the Internal Error Amplifiers. The Integrated Error amplifiers of the TL494 can adjust only the Duty Cycle, but NOT the Frequency. There are other Switchmode Controllers that can do both.

@@KonstantinGrigoriadis ah I see, that explains😀 I think I will be experimenting with H bridges and maybe resonant circuits (convenient with the variable freq. ) I will follow you for sure! All the best / Arve

Hi Bjorn, thankyou! its called Pentafilar, from Penta 5 :-), Cheers, Konstantin

@@KonstantinGrigoriadis thanks, i'm gonna study that type off transformer. Out of old habit, it always use LM78xx regulators to build small linear powersupplies, and if i need 2 different voltages like per example 5V and 12V, i placed a LM7805 after the LM7812 and use a big smoothing capacitor and a 100nF capacitor for reducing transients on the input and output. When i think off switching powersupplies, i always think they are noisy, but i think with a good design they can also be very quiet. Grtz

Bjorn, its just a 5 winding Transformer, coupled coil, where the 5 wires are tightly twisted together to ensure a tight coupling. The Design is all about Isolated Rails.Cheers

Thankyou! They are faster, but I Use the Bargraphs on normal 1602 1604 Displays too without speed issues.

Thankyou, Yes.

One noise that is hard to get rid of is the noise that gets onto the secondaries via capacitive coupling. A common mode choke helps on this.

Hi Bjorn, Thank you, yes send me a Mail, but Donno if I can Help :-) Cheers, Komstantin

Hello Rick, thankyou !

Hello, Thankyou, the Small repeater in Video #2 has no Flaw and is not a Fake either, it is in Principle the schematic of a Cheap GPS Active Antenna reversed and that is what it can deliver :-) I think it was Designed for Cars Primarily to deliver GPS in the Interior. It uses a small RX Ceramic Patch antenna and drives it with far to less Power .Cheers , Konstantin

Hello, thsnkyou, seems you are the only one interested on RFoF …. Nobody else commented

Hello, Thankyou, yes perhaps, but I cant see any metal inside.

Hello, Thankyou! I hand soldered 5 Pieces for my use, but except of that there was no interest :-) even that the Design Files are available on Request. I will make another Video in the Future more in-depth when I receive another 5 that i send for PCBA. Btw, there are some nano Boards from Ali that have The PB version on it but they doesn’t break out the additional pins.

@@KonstantinGrigoriadis I was surprised that no one had commented. Granted, the ATMEGA328/P/PB is a pretty basic chip line. I think a lot of people have moved on to ARM and ESP32-based boards. To be honest, I probably wouldn't have the same interest in the AVR chips if it weren't for their 5V capabilities and their relatively good ADC performance, but those characteristics are very useful in a lot of applications. The extra features of the PB variant remove a lot of limitations of the P version. I think people would be quite interested if they understood the improvements, but many Uno/Nano buyers are relatively inexperienced and don't have the technical knowledge to see the value, particularly without default support for the PB chip in Arduino. By the way, I found your video _because_ I had purchased some of those Nano boards on Ali. It's too bad they made no mods to support the new pinouts of the PB chip, but it's still nice to have the extra features. And clearly the lack of design updates is reflected in the very low price. Regardless, I'm looking forward to your next video on this topic. And subscribing. 😀

Hello and Thankyou! I have to admit that in that Period (1-2 Years ago) I used CZcams only as Platform where I could upload Videos and put these URL's as Link in Forums Like EEVblog... I never had thought at that time that I will make Video FOR CZcams. Now I am revisiting some of my Projects where I think that eventually there would have been more Interest if I had done a better Job with the Videos. I want to try a New PCB House for Double-sided PCBA and for that I will use this PB Design. Btw, I never Put them on Tindie or Produced them. I will put on PCBWAY as a Shared Project where I will Upload all the Production Files for the Top Layer, on the Bottom Layer there are just LDO's and few Capacitors that can be soldered easy by hand.

Hello, Yes it's a more modern Version of the TL594 with a Better Output Stage and Internal Circuitry that Prohibits Double Pulse at Either Output.

Hello, Thankyou ! I didn't said it reduces Electrical noise on the Output, I said with this arrangement the Radiated EMI to surrounding components is reduced. I also gave a lot of thought why they put it there and in my opinion it is because if it was on the hot Side after the MUR3060PT/PA Diodes Bridge, it would induce Noise into the MUR3060PT Diodes and the Diodes themselves (having the Cathode at the Cooling Tab) capacitive coupled to the Case via the Cooling Pad. Instead now the MUR3060PT Cathodes are directly connected to the Smoothing Capacitors and have more or less a DC Voltage on it instead of Large Pulsing. That's my only logical explanation. I saw it done on other CHINA PSU's too of similar Build but instead of a Bridge they had a 2x MBR30100PT double Diodes in Parallel.

@@KonstantinGrigoriadis Thank you very much for the explanation! I totally forgot to consider a possible effect of capacitive coupling to the heatsink!

Wie hast du mich gefunden :-)

@@KonstantinGrigoriadis Ich finde alles :D

Noted :-)

Please send me an Email to reply you with the Design Files. Cheers, Konstantin

​@@KonstantinGrigoriadis much appreciated my friend

Hi, I didn't received an Email yet, my Email is in the "Channel details", Cheers, Konstantin

​@@KonstantinGrigoriadisyoutube is taking down email IDs for some reason

Hello, Yes, I know Open Email Addresses or Links are not allowed in the Comments, this why I said to send me an Email to reply you with the Design Files. my Emails is in the "About/Channel details" Tab. Cheers, Konstantin

Hello, this is Correct, BKLT_ON is a 5V when Backlight is OFF and 0V when Backlight is ON, its an Inverted Signal. If the Signal read as above but the Backlight Stays on all time then the is an issue with the CCFL Inverter Board with the Switching Mosfet Perhaps. In the Description of my Video I have a Link to EEVBLOG where I Uploaded my Design along with my Reverse Engineered Schematic of the Original CCFL Inverter Board.

@@KonstantinGrigoriadis hank you very much, kind friend. I bought an LED backlight driver board online. The 5v signal turns the backlight on and the 0v signal also turns the backlight on, so it seems I cannot use it. I plan to make one according to your design. Thanks again.

Hello, you can find the Data hete too : www.pcbway.com/project/shareproject/TEKTRONIX_THS710_THS720_THS730_LED_Backlight_drop_in_replacement_Controller_180430eb.html, its the Controller I made.

Hi Steve Thankyou ! Please send me an Email to reply you with the Design Files. Cheers, Konstantin

Hi Steve, I didn't received an Email yet, my Email is in the "Channel details", Cheers, Konstantin

@@KonstantinGrigoriadis Thank you… I think the CZcams chat eliminates personal info (?). Anyway, thank you, I will send to your address. Thank you, for following up! Cheers!

Hi Steve, Links and open Email Addr are eliminate, yes.... Cheers, Konstantin

Hi Bjorn, Thankyou. I used the LR8 as a High Voltage Constant Current Source couple Years ago. Cheers

My pleasure!

Hi because: 1) I wanted to have future flexibility on high level (full Linux was a requirement) 2) If I would have made a GPSDO it would have been a total different Design. 3) Further the whole design had to be finished in 1 week including hw design. I use mcu’s extensively but not with an OS. For my Design an mcu had no benefit over a low cost sbc, not even price-wise or time-wise

Hello, what you mean with this message ?

@KonstantinGrigoriadis : Sorry , professor, sir . I studied Networking . I studied Electrical engineering and Electronic engineering before computer 🖥 Networking. 😆😆😆

Indeed :-) Radio 813

@@KonstantinGrigoriadis lemme check my files ....Since we are name dropping....Roz Panthiras....98.5 :)

Hello , Thankyou! In my Build I redesigned completely the Socket Receiver, Socket Boxes concept to fit my needs of near 0 mechanic work needed :-) I use Pcbs for almost everything. Cheers, Konstantin

@@KonstantinGrigoriadis I was thinking of designing something similar, was worried about oscillation, but I’ll have to try it out

I Designed it to not have Oscillations as seen on the Videos :-)

On the Following Links of Helmuts Page I have a description of my Built with pictures: www.roehrentest.de/NB%20Grigoriadis%20Konstantin.html and www.roehrentest.de/NB%20Grigoriadis%20Konstantin%20ROETEST%20V9.pdf

@@KonstantinGrigoriadis thank you for sharing! I’ll definitely design something similar for mine as well! I

Thankyou!

Hello, Thankyou, if i would make that video 10-15 min only, either I had to omit lot of Information’s or I had to split it in 2 Videos. Same with all my Longer Videos

Thankyou

Hi, no there is no missing capacitor, the one you probably mean as Missing is C4, its just differently drawn, Cheers.

Hello, no bcs of many reasons, 1) the software does not support more, 2) the transformer is for 5a, 3) the power stage is not designed for higher currents, Cheers, Konstantin

@@KonstantinGrigoriadis thank you for explaining. ...