Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Here is a very readable account of where the 4.44 originates...except I do not quite understand the final steps.
davelevasseur.com/wp-content/uploads/2021/12/TN84-Why-4.44.pdf
Firstly, the average of a positive half sine wave is found as about 0.636.
Then they look at the case of a square...
Hi Klaus
The question I had in mind was simply "How do I synchronise PWMs on separate PICs ?".
Now, I look at the thread's title and it does not say that - I do not know why I typed a misleading title... apologies.
However, the wider question mentioned (actual code synchronisation) might...
Hello Klaus
My understanding of the suggested solution is that
(a) The PWM duty is compared with the captured timer value.
(b) Because the same timer is used for PWM and capture, we know that the value captured is the time offset from the start of the PWM cycle
(c) We then want to...
Thank you Klaus
I missed the 'Attach Files' button as I was focusing on the row of icons at the top, wheras 'Attach Files' is a button at the bottom.
The range is 7.3Hz to 8MHz.
On the existing hardware, I believe the two PWMs are (in principle) 'perfectly' synchronised.
I would like the...
I wrote a "user guide" for the existing design which should explain things well.
I was about to attach the PDF file, but that option seems missing from this forum, so I'll add some images. I can't add the images either, the forum wants a URL.
Here it is on ebay - the specifications are there -...
Many thanks indeed for all the replies. My application is a user-configurable PWM source with 2 channels.
In the case where both PWM run at the same frequency, the user can choose to exactly align phase, use quandrature phase or arbitrarily choose any desired phase.
For fexibility though, I'd...
Suppose I have to synchronise multiple PWMs on separate PICs, how would I do that? Assume the two PICs share a common system clock.
Of course, one 'solution' is to side-step the question and find a PIC with enough independent PWM modules which can then somehow be sychroninised... However, I am...
The criteria I currently use are
Schottky diodes tend to have greater reverse leakage (and the lower the Vf, the larger the leakage)
Schottky diodes have less forward voltage drop (Vf)
Schottky diodes have zero stored charge
From the above list, I'd only prefer a silicon diode if leakage...
Thanks for the replies!
Whilst I was aware that gate capacitance could be a problem for the op-amp, I simply searched the LTSpice list for 'fairly low gate charge in comparison with the others in the list'. I should have checked more carefully, especially in relation to the chosen op-amp's...
In AoE - The x-chapters, fig 4x.124 shows a way to cancel the error due to non-zero base current. The circuit sinks 100mA.
When would a designer choose a BJT over a MOSFET in this circuit, given the MOSFET has such a small gate current requirement - for better frequency response?
<EDIT> I...
Am working on a (non-safety crtical, 2nd line of defence) industrial smoke sensor project. We are using an RE46C200 chip and we are at last seeing nice results. However these rely upon a smoke chamber taken from an existing domestic detector.
Basically these chambers have to
Permit the...
Hi
Despite opening a case with Microchip, I'm unable to make a composite CDC+HID device work (no matter how simple).
Microchip were helpful - but I still have no working solution. they told me
"The MCC USB Device Lite library does not support creation of a composite device in an easy way at...
I have a commercial smoke detector which I'd like to use for experimental purposes. It uses a soic-16 chip by "SEMIC": CS2105AGQ-S1Z, TGAY2VU401L.
The piezo sounder is the type with 2 terminals (ground, brass and silver <--> ground, drive, feedback ?).
If the piezo has a resonant driver...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
