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Cliff, Howard and Others: Congratulations Howard!!!!? Glad to see it is working for you. Cliff - you did a much better job of explaining this than I did.? Yes, you will get the dreaded message if

Lee, Not class E.? Its class D and MOSfets or Bipolar transistors can do that. Class-D requires a on state (saturated) that Mosfets do well.? ?Its not device speed as IRF510 is more than good

Tony, In LTSpice if you hover the cursor over a component as if to measure current through it, then press ALT and right click, LTSpice will give you a plot of instantaneous power. You can window that

Hans, For any dissipative non-reactive component, linear or not, the power being dissipated at any instant is V(across) x I(through), period. It's that simple. There are not many places for the

Jim, as a followup, I did just find this answer ( https://groups.google.com/g/digipi/c/u7cczaULk8o/m/1Q5pRooWAwAJ ) to the question of running logging programs on DigiPi, from its creator: The extra

John, A couple of things. First, how are you getting the mosfet dissipation from the spice simulation? Are you eyeballing an instantaneous power (Vd * Id) waveform and doing a mental

While RD16 is a good RF device it offers nothing is switch mode (class-d) service as it has a poor Rds-on which is typical of RF service devices. Note: the RD-16 has a breakdown voltage of 50 Volts,

Yeah I forgot that one ;-) -- - 73 de Andy -

Check out the last page of the manual.

Hello John Isn't the calculation fraught with difficulties? Where did the 0.5 microseconds assumption come from? Wouldn't that depend on the effective resistance to ground of the parallel BS170s

I should add the 5v is from the usb micro lead.

I'm running it on 5 volts so perhaps I should raise a ticket?

I just noticed that Revision I of the QMX assembly manual has been published.? I haven't seen anything posted here about it.? Can Hans - or someone else - tell us what has been revised? I'm halfway

Not sure if it is related but there is a lag on sidetone implementation with keying in iambic mode much above 16wpm which causes errant keying. Hans is aware of that issue. Not saying it is the same

Hi Evan, This is my take of QDX class D amplifier as an experiment. I am using FDT86256 mosfets instead of BS170. The driver is different than QDX. As I said it is just an experiment board. It is not

Hi, About a week ago in a project I simultaneously fired up two ProgRocks - each with 3 outputs enabled - from an 11-ish volt supply - this was from a 12.0 volt supply with two diode drops as the

Barb, Is the IR image off compared to the background?? The hole in the upper left corner is off by about the same amount as the two hot spots that could be the transistors.? It could be that the

That is my issue here. Class D and Class E amplifiers should have relatively little heat generated compared to AB1 or AB2 amplifiers, based on my understanding of relative efficiencies . I suspect

Hey guys. I have just built my new QMX and it works just fine except the volume control. I have read somewhere in the threads that it is a software issue and will be fixed on the next firmware, but if

Ted, I am a bit lost too! In previous posts there was an inquiry for heat map of BN43-202 binocular during tx so I had those flir photos of my design which guves similar tesult as QDX. I thiught this