Electronics > Beginners
HEF4013 flip flop question
Chris Wilson:
--- Quote from: T3sl4co1l on May 23, 2019, 03:31:55 pm ---Yeah, bingo. Si5351 is a 3.3V device. You need a logic level converter from 3.3V to 12V.
Tim
--- End quote ---
OK, thanks Tim, so what i am seeing is the Si5351a is generating just enough t fire the 4013 but it's far from ideal or reliable. What about using a logic level flip flop like a 74HCT74? That should correctly trigger from the Si, right?
The other thing I am seeing is unlike the ultra reliable, perfect FET gate and drain waveforms on the similar LF amp, the MF one shows one fairly decent gate and drain waveform on one pair of FET's, but the other pair show incredibly spiky drain waveforms and poor gate waveforms when power to the FET's is applied, intoma good Bird water colled dummy load or the antenna system. I have tried changing the FET driver IC's over, tried replacing the driver IC's and the FET's even to expensive ultra low gate capacitance ones, and tried swapping the gate leads from the drivers to the FET's over but the same "side" of the output shows bad waveforms. I also swapped out the 1500pF and 10 Ohm R1, R2, C3 and C4 components, and still the same side shows bad waveforms. the transformer wiring is symmetrical, I even changed the whole transformer T1 out to a newly wound one on on a different core,
https://www.buerklin.com/en/Products/Passive-Components/Inductors/Ferrites/Ring-core%2C-outer-%C3%98-x-inner-%C3%98-x-height-%3D-63-x-38-x-25-mm%2C-N30/p/84D258
but still the same side has bad waveforms... I can't see why this should be... The circuit is as below in regard to after the FET driver. I was using an HEF4013 flip flop and a pair of IXD_614 FET driver IC's. The interconnections are pretty short. The FET driver to FET gate wires are short and symmetrical.
www.ixysic.com/home/pdfs.nsf/www/IXD_614.pdf
T3sl4co1l:
Need layout pictures.
Tim
Chris Wilson:
--- Quote from: T3sl4co1l on May 27, 2019, 05:38:35 pm ---Need layout pictures.
Tim
--- End quote ---
How embarrassing, but OK, will have to be in the morning as one of our old dogs died peacefully today and burying her (she was a BIG dog) has fair knackered me as I had to get through a load of tree roots, before making progress with a big 4 foot deep hole. Age, alcohol and generally unfitness has taken its toll of me these days! I am in bed looking forward to a pint of frothy medicine later in the week. Thanks Tim! Will update later with some photos.
T3sl4co1l:
My condolences. Take your time!
Tim
Chris Wilson:
--- Quote from: T3sl4co1l on May 27, 2019, 07:04:11 pm ---My condolences. Take your time!
Tim
--- End quote ---
Thanks Tim, an old dog, but she had a good life.
Here are some photos, zipped up. http://www.chriswilson.tv/1kw.zip
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