Author Topic: mikrocontroller code?  (Read 7744 times)

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mikrocontroller code?
« on: March 22, 2009, 18:02:23 pm »
hi, i was wondering if anyone has built a pwm using a mikrocontroller? i want to replace the old lawton 555 circuit because it is not contemporary anymore and does use too much energy / is too big.

i am into learning how to program mikrocontrollers at the moment but if anyone has done a decent pwm system for something like an atMega8/32 i would have more time for other things.

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Re: mikrocontroller code?
« Reply #1 on: March 22, 2009, 18:19:13 pm »
I'm sure this answers most of your questions regarding pwm in uc's:

http://www.mil.ufl.edu/imdl/handouts/ATMPWM.pdf

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Re: mikrocontroller code?
« Reply #2 on: April 01, 2009, 22:52:30 pm »
thanks alan,  today i finished my pwm system, which can be used with a duty cycle from 0% to 100% and pulse frequency from 0,25Hz to 8Mhz,


news on my project: I got my tubes with a gap of around 1mm and a bifilar coil, will measure the inductivity and capacity of both and with the help of that set the frequency to resonate.
at the moment i cannot get more than a few volts on the tubes, if they are not present i can measure nearly 500v after the transformer depending on the frequency, voltage dies in water as some people told before.

if i cannot get this thing to work i'll drop meyers completely, i followed the process described in his first patent which lay the foundation to his other work, if that doesn't work i'll let it go..

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Re: mikrocontroller code?
« Reply #3 on: April 01, 2009, 23:04:07 pm »
thanks alan,  today i finished my pwm system, which can be used with a duty cycle from 0% to 100% and pulse frequency from 0,25Hz to 8Mhz,


news on my project: I got my tubes with a gap of around 1mm and a bifilar coil, will measure the inductivity and capacity of both and with the help of that set the frequency to resonate.
at the moment i cannot get more than a few volts on the tubes, if they are not present i can measure nearly 500v after the transformer depending on the frequency, voltage dies in water as some people told before.

if i cannot get this thing to work i'll drop meyers completely, i followed the process described in his first patent which lay the foundation to his other work, if that doesn't work i'll let it go..

If it doesnt work , you have to research why it doesnt work and find a solution .

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Re: mikrocontroller code?
« Reply #4 on: April 01, 2009, 23:18:47 pm »
how many people are on this for years now and have not replicated it? the only ones who claim that they have results do not share how they did it so it's kinda obvious they didn't have success either.


the well documented replications do not work either, i'm afraid you were right about ravi. did not work.

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Re: mikrocontroller code?
« Reply #5 on: April 02, 2009, 19:41:16 pm »
try to find the resonant freq without the watercap (max voltage), then play with the dutycycle for voltage stepup effect

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Re: mikrocontroller code?
« Reply #6 on: April 03, 2009, 15:45:39 pm »
a coil alone has no resonance frequency.

or do you mean just no water in the tubes?
« Last Edit: April 03, 2009, 16:43:43 pm by haithar »

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Re: mikrocontroller code?
« Reply #7 on: April 03, 2009, 18:28:09 pm »
How have you wound the coils?

try to measure the voltage across the chokes without a cap and see if it varies when you change frequency (don't now if this is valid, but you can try it, need a hv probe). if it does, try to find the highest voltage by adjusting the frequency.
Try the same with the cap.
meyer said Xl > Xc, which means the impedance of the choke is max (no current, max voltage) and the impedance of the watercap is minimal (all current through cap) @ a frequency = no current trough coil and all current through cap (but amps are choked), try to look for these properties.

Just fool around :) you know what to look for, try not to get obsessed with trial and error to get bubbles, that is a step ahead, look for no current, max voltage and step charging by finding out the correct dutycycle (T2 < T1), T2 equals the timeconstant of the choke.