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The correct line is selected on mouse up, not mouse down. So slide the finger to the target line and lift the finger.

I have noticed this even on LDMOS. i dropped AFT05MP075, a 75 watts LDMOS transistor in place of the IRFs. In this setup, there are no thermal pads. The LDMOS is directly soldered onto a small copper

Whow about real RF transistors? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner –

Most prominently exhibited by those poorly designed amplifiers that do not account for thermal effects to bias related voltages. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ

After I modified the output stage circuit at SBitx v2 ( /g/BITX20/files/Sbitx_V2%20modification%20to%20protect%20FETs.pdf ) , I only now had the opportunity to test it in

Because they are not lead (Pb) free, lead free one are about $2.34 US. -- https://www.vk5tm.com

No chuckle here.... I ran into that building guitar pedals. The ic's I bought were labeled MN3007 which are kinda hard to get and expensive. But they ended up being a MN3207 which does pretty much the

Ashhar thanks for all that experimentation!!!!

Great!

Why are they so costly? The 2N2219s are about 9 dollars on Mouser. - f

Some of you guys may get a chuckle from this, but I tried swapping some of these into my uBitx and never really got them to work. Didn't think too much of it and moved on. I'm working on some

V3 fixes these. It works pretty well, I must say. - f

Upgrade to V3. It sorts all these problems. - f

Thanks. ?This is what I was looking for. -- Bob AA4FJ

Ashhar, can I first of all congratulate you on all the work on the sbitx V2 and V3. This new V3 I have upgraded to is superb and has gone well above all my expectations. It must surely has made the

Farhan; I switched out the silpads in my DE for Alumina Ceramic insulators. The attached thermal image photos show the stock silpad under the right FET and an Alumina Ceramic insulator under the left

Gordon, I failed to mention but I have tried it with Aluminium Nitride, Silpads (Grey and Blue) and Mica insulators, there was no difference at all. I should get a contact sensor to measure the rise

It would be interesting to see if the drop in power is reduced with aluminum nitride insulators. Previous work has suggested it will decrease the rise in temperature of the die For a very

The following files and folders have been uploaded to the Files area of the [email protected] group. * /SBITX KB1GMX-mods ideas./Bias Circuit for LDMOS Amplifiers.pdf (

I put a copy of the full article in the files area under my call. -- Allison ------------------ Please use the forum, offline and private will go to bit bucket.