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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.
btw unrelated
I did find a note about how to calc the power of the gate resistor
see below
>The gate resistors are in series with the gates but they are all driven
>from a...
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...
Re: Light/dark switch
try something like this (Last page is schematic)
**broken link removed**
or this
http://www.discovercircuits.com/H-Corner/12LightDarkSw1.htm
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.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=X062-ND
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.
**broken link removed**
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
i2c cable
If you need to go farther, or are having problems, take a look at this
http://www.ccsinfo.com/forum/viewtopic.php?t=39938
He is a great poster. He knows what he is talking about.
Follow what he says and use that chip P82B96L.
**broken link removed**
Also see figure 1...
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.
**broken link removed**...
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