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My latest product went to EMC testing and failed miserably. I run the circuit from 115VAC and a long cord. I will test soon, but my gut says that the noise is comming in on the 115. Has anyone built a circuit(filter) for such a problem? The EMC high freq test is a steel plate driven by a...
I see what you mean.
Can you tell me how you calculate the 100 ohm gate resistor.
That is what I'm have trouble with.
I did find a note about how to calc the power of the gate resistor
>The gate resistors are in series with the gates but they are all driven
I have a relay that is driven from a PIC 18F452.
It is driven with a FDV301N N-FET.
I've put a 10k in series with the uC pin to limit current to the FET.
NOW I want to put a pull-down on the pin for when the micro-controller is in
reset and the pin is set as input. so I don't want the input to...
I don't think the mode has anything to do with it.
If you want to read 24 bits at a time you will need 24 free input pins.
If you don't have 24 available input pins, then you could latch the results and read
say 8 bits at a time, and mux to the next 8 and so on.
The 8 and 16 mode you refer to...
Re: what does PPm/deg celcius denoted when mentioned in spec
PPM is parts per million.
I've seen it used in oscillators.
where its rated at 20MHz ±30ppm/deg C
So your value(20MHz) can be off by +-30 hertz per million...
very very hot
I don't know who wrote this,... but it works and it is very handy.
the cooool thing is you get to see how changing a parameter changes the parts.:D
p.s. i start with 10mV ripple and 40kHz
If you need to go farther, or are having problems, take a look at this
He is a great poster. He knows what he is talking about.
Follow what he says and use that chip P82B96L...
If blue is the color of your bottom traces(it is for me) then it sound to me like your
trying to route net A through traces already routed on bottom for net B. Net A and
B can't touch, that a short. Its just may be that you didn't see them (refresh screen)
problem. Sometimes when I change...
homemade credit card reader
I've made one of these. I bought the reader, that outputs wiegand.
((it doesn't make sense to build the reader/head unless your making millions of these))
Then the PIC reads the wiegand and outputs to the PC.
Some readers are shown here...