Conrad, I just want to know what to do with the PWM and tacho wires if I do NOT want to use them. The tacho wire is an open collector output. You can simply leave it disconnected, and it shouldn't ca
Chris, Jim, and all, in addition to various circuitry that performs audio processing at varying levels of versatility, quality, and cost, we should not forget the possibility to do it in software. Al
Jim, and all, we should not forget the possibility to do it in software. Yes, certainly a possibility. But have you looked at latency? This may or may not be a problem. Indeed my first thought was th
Hi Chris, OK, it's not actually a SMPS, but similar, a 136kW LF amp. I built it some time ago. I hope you mean 136kHz, not kW! :-) I had been looking at gate and drain wave forms and saw nothing horr
Jim, Why that question? And how much, how and where do you operate? It puts ones opinions and experience in context. And your response was helpful. Operators opinions of what works and how well, what
Hi all, It's my humble opinion that this whole thread on how to cool high power solid state amplifiers, using water (or evaporation, oil, freon, whatever) is on the wrong track. Instead of using high
Jim, Only a few do, on short wave, most of them just outside ham bands. Most broadcasters use AM or FM, of course. I do take your point. High efficiency amplification is trivially simple on FM, and o
Hi Doug, I have been poking around on Internet looking for a scholarly article or two on generating SSB using switching techniques for the RF generation. There is a lot of material out there. But not
Despite being a tad off-topic, I will add my input to this thread, from the point of view of someone living in Chile, and often buying stuff in the USA and many other countries. This might be useful
Okay, folks, can we then perhaps reach some consensus, or recommendation about what exact liquid to use in watercooled electronics? It has to be water-based, because there is simply no other liquid t
It's fun to see you quarreling, once again, over the "are tubes or transistors better" question! I thought this had been about settled, back around 1960 so or... When you handle them, do you have an
Mike, In my limited research I've found: (RM Italy seems like lower power and some are illegal in NA) (SGC no longer making the power cube I don't think) (THP out of business) What else is out there?
Bill, Jim, Be careful with so much power in a mobile. Many newer cars are highly computerized and won't tolerate RFI. YES! My 2006 Toyota Sequoia (big SUV) went into "limp home" mode with only 100W o
Carl, It has been called a condensor ever since the distributor was invented. Called that by people from all walks of life and education, DIY parts houses. And in fact that's probably the correct wor
Hi all, just a quick comment about a point touched by Joe: Several of the newer LDMOS designs are using *two* active devices rated at 1500W each. I'm not aware of any LDMOSFETs rated at 1500W output
Hi Cathy, So would it be better to use 4 or or more devices with somewhat lower ratings for linear operation? I do think so. Specifically I would look for devices designed specifically for linear ser
Cathy, I'd welcome your opinion on the design. I will provide it in this mail. Mine looks to be this design: http://www.kg9e.net/projects/hfpacker/ It may be telling that K5OOR has resigned the amp s
Hi all, nice to see so much activity in this matter! Here are my condensed replies to some posts by several of you. I'm merging them all into one post, instead of posting many separate replies. Jim,
Cathy, You guys should publish a construction article(s) in QST and other nations' equivalent magazines. A lot of us would love to build such an amp, but we're not competent to design it. Such articl
Steve, Can you explain what this design is trying to achieve with separate transformers for the output (T1) and for supplying DC (T2) ? Why not the more traditional center-tapped transformer that act