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I already ordered AlN insulators from Aliexpress. They should arrive in two weeks. 73, Wojtek SP5DAA

That’s great news! I would strongly suggest switching to the aluminum nitride insulators Gordon kx4z

Yep, at least I had a bit of foresight and ordered a few more pairs of IRF510s. I'm going to pick it up again tomorrow. I've found that in cases like this, more than a few hours and I start to get

Yes! Replacing the MOSFETs fixed my sBitx v3. So I have learned two lessons: * Running continuously in FT8 mode requires either reducing DRIVE or using a fan to improve cooling MOSFETs (especially if

So typically what you do there is unsolder the drain on each MOSFET and just disconnect it so that you can stop those from potentially taking all the current and then see if you still have the direct

ConstructionManual PDF Document · 1.4 MB

Well, the reverse voltage or whatever happened might have fried the MOSFETS

https://www.qsl.net/nf4rc/2021/PolarityProtectorPartOne.pdf

Yes, so I've removed D7, I have a direct short to ground, somewhere. I haven't even thought of plugging a pi into it since this began. Right now, even if I apply only 2-3v, the fat trace running from

Gordon - do you have the circuit diagram for that protector? Gerry Sherman Sent by the Windows 11 Thunderbird

If you have a current limited supply at about 2Amps OR a variable voltage supply, Then you could do a preliminary test after replacing D7 so you again have SOME reverse polarity protection. We

Not sure, I must have inadvertently applied 12v somewhere I shouldn't have. Either way, I doubt that I can check any further damage until I replace D7. Probable worst case would be having to drop $40

Michael, how did D7 get damaged? Was reverse polarity applied to the radio at some point? that would be the most likely way to damage D7 and it would have serious impacts on some of the other

So, after the diagnosis and repair of the power group components, Q9,Q10,Q101,R5,R6 (all replaced), on power up, +12v drops to under 2v and the area around the Q12-15 group heats up quickly. I did

Thanks a lot for sharing Best 73 Patrick

This needs to be implemented in sBitx V4, Getting back to the SMS 5V regulator noise, I just finished building a QRPlabs QMX+ and while it uses 3 different SMS regs it does not exhibit any noise from

*Software Release Announcement: sBitx Version 4.4* Version 4.4 introduces new features, enhancements, and fixes to improve your experience. Here’s what’s new: *New Features:* * Added power

Pro ty, co si nedoká?í najít translator:? It's good news for all those waiting. There is no need to force the HF Signals collective to hurry. They do their best to make sure everything is in

Well, let's wait with celebrating until I replace the MOSFETs and find the device working properly. What annoys me is that I didn't detect that parasitic "diode" between gate and source at the first

Hi Ramon, Try adding noaudio to the vc4-hdmi (not sure this is the correct name) line in the config.txt file in /boot.? I had to do that for an external HDMI monitor with audio. I still need to