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Dear Friends:
After reading of several references about IH i found that a starting point of designing of any IH is a coil design, because a coil will handles the required power and transmits it to the load, so if you design your suitable inductor, after that you can choose capacitance and...
For Accurate measurements i suggest to use ADC (like ADC0804) instead LM3914, it gives you 8Bit Resolution and just you need to convert from 5v logic to 3.3v one, you can do it by general purpose npn transistor with suitable resistors.
if you have a uC in your project, so use it's internal ADC instead of LM3914.
you should build only a voltage divider (13.8v==>5v) for battery and measures it's voltage
Dear Friends:
I solved a problem as follows:
1- Grounding box(because a high voltage respect to human body was measured on box body)
2-initialize LCD before sending data(to clean it if any funny characters appear)
i know it's not a perfect solution, but in my next designs i will apply a full...
Dear FvM:
Thanks for your valuable support.
i did some tests on LCD and found this points:
1-Holding points are float, not connected with VSS.
2-There was two capacitors C1,C3 between VDD,VSS missed (i think those for bypass)
3-LCD metal frame also float, not connected with any pin.
what's...
Re: LCD 16*2 Problem with Atmega8 microcontroller
Here is a circuit:
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i connected lcd body with metal sheet through screws to fix it, as you notified, it maybe a major reason of my problem,i will try to isolate it.
when i fixed lcd directly to controller board there...
Dear Friends:
I built a points welding controller for automatic welding machine.
everything was good except lcd display,if any inductive load runs or enabled it shows garbage characters and unreadable Chinese characters.
i used 20 Cm ribbon cable to connect it in 4-Bit mode.
main controller is...
How to achieve 25 ohms impedance?
if i added a series 35.3nF capacitor with resonant tank (impedance equals 22.5 ohm @ 200kHz) it will work or not?
i appreciate your help
regards,
hi,
your schematic not clear enough to understand your problem, if you show us a full schematic it will be good.
anyway, in inductive loads as motors you should add a parallel snubber circuit (R,C) with triac to save it from high dv/dt and to prevent currents from flowing.
you can put a high...
Thanks for your help
i will try to apply 200Khz with standard Mos or IGBT, but i don't know if IR2110 drivers can handle this frequency!!
as i understand, with 200Khz i need a small working coil and a small parallel capacitor, am i true or not?
let's consider a working coil will be 2uH...
show us schematic
anyway, change pulldown resistor to 2K or 1K and at top of your code, put a clear instruction for an ouput that drives your Mos.
regards,
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