Doug KB8M did a beautiful job with his Michigan Mighty Mite. But, as often happens, it still didn't work. He turned to us for advice. I gave him a long list of things to check, but Pete brought the power of superior tribal knowledge to the problem and spotted the defect immediately: The transistor was in backwards. It is a P2N2222. That means the pin out it C-B-E not the usual E-B-C. I had fallen into this trap with one of my BITX rigs and had to pull out and reverse many of those transistors. Fortunately for Doug he had used a socket for the transistor. TRGHS!!!!!!!!!!!!! JOO!!!!!!!!!!!
Re: Is the design feasibility of 160M 625W Class D transmitter?
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Noticed your online...
The calaculator seems great...
Do you have the link...
Ohhh you just departed...
Wayne
24 minutes ago
Look for one of the cheap Chinese eBay testers GM328A they are only a few dollars and they do LCR and give pinouts for diodes and transistors FETs the lot! Got a junk box full of old transistors, just test them quickly Bill. Cannot be without mine.
ReplyDelete73 David GM4JJJ
The Mighty Mite needs a mate!
ReplyDeleteI will also say it has "soul". My 8-yr old son Wyatt helped me wind the coil. He was excited to see/hear the MMM transmit on our receiver. I used a socket for the transistor and crystal. When I made the PCB I even etched "CBE" at the transistor socket so I wouldn't do that! Fun times
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ReplyDeleteThis is Fine Business.....you've passed a couple of the first tests for lifetime membership in the International Brotherhood of Electronic Wizards. Putting a transistor in a circuit backwards is the little known first rite of passage immediately followed by experiencing JOO! Congratulations on the beautiful little build - and really super that Wyatt helped you out. That is how it begins!
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