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Ordered And Thanks Summers over so time to get back to my ubitx projects Regards KB1HKO Laurence Oberman

Ladies and Gents Gordon Gibby, KX4Z has offered us a great little kit to release and its now ready! This digital interface has all the bang with a great price. On board 5v regulator that you can power

Yes

When dropping down voltage I always use more than one regulator in series to split the dissipation. E.g. 7809 or 7808 from the nominal 12V then to the 7805 and bolt them to the aluminium case or to a

Maximum current draw for the 5" Nextion (backlight @ 100%) is?410mA Arduino Nano ~20mA Si5351 (all outputs enabled) ~22mA Assuming 13.8V input, there's over 4W of thermal power to be dissipated. As

Check , raduino with nextion miight need 1amp odd. You cant work at 100% with input 12 or 13.5v. If the 7805 input is just 3v above what you said is understandable. Better try a genuine 78s05 it might

Have had success with the stock 7805 mounted on the raduino. Have 4 of the critters with up to 3.5" nextions I use a stock power transistor heat sinks with an additional hole. To mount it. Have found

From this example, are you saying that your software shows the SDR at 14.076, but it's actually receiving at 14.0775? Then the RTL-SDR and your software need to be calibrated. Which SDR software are

Very simple the 7805 and kin are linear regulators and at 500ma the max voltage that can be tolerated before the power dissipated as heat is about 1.5W which places the input voltage at not more than

I have had the coffee today.. maybe need to keep a white board at my side when I read these posts?!

Perhaps thermal overload, but I was having problems with the 7805 until I replaced it when I put in a 5" Nextion. I did not try the heat sink as it required more cutting to fit then I wanted to try. I

Hello Jerry, I ordered 5 pcs. of them. After it did not work-from the 1th second!! )- i tested 2 of them on a small breadboard. Without load and with a load of a few 100 Ohms. The did never work.

Hi, Maybe check the firmware and make sure there's a delay between switching the relays and enabling TX RF? -a wrote:

You are 100% right!! tnx Verzonden: dinsdag 17 september 2019 13:06 Aan: [email protected] Onderwerp: Re: [BITX20] Nextion with KA78T05 Why would you need another regulator ? The LM7805 is designed for

Did this sell yet?

Could be that you got bad parts. Or could be that the part is getting too hot, and going into thermal shutdown. So you need a better heatsink. On page 2 of this Fairchild datasheet for the LM78T05, it

Clark, Please forgive my lack of clarity.? I'll try to fashion up something better and make a go of individual relay measurements within a week or so; I'm about to have vertebrae C3-C7 fused and

Why would you need another regulator ? The LM7805 is designed for 1A output and the 5" Nextion display + Raduino uses about 500mA (per specs). You only need a heatsink for the LM7805. This will be

Hi I did the same only the KA78T05 I got (bought 10 cause they were cheap) went red hot ? so I shut it all down and went back to the step down to power the Nextion. Luckily it didn’t seem to

I think I have to explain a little more. My ubitx is calibrated and works on the right frequency. I can oparate FT8 or WSPR without any problem. The thing is, when I connect a RTL Dongle?(hooked up