figuring out what resitor to use...
okay i figured out i need a resistor to take off .5 Volts
im trying to use ohms law to figure out which resitor i need
V = I X R
i know that the voltage is 4.5 and im not sure about the I but i guess
R = V % I
how do i know what the value of i is ?
im trying to use ohms law to figure out which resitor i need
V = I X R
i know that the voltage is 4.5 and im not sure about the I but i guess
R = V % I
how do i know what the value of i is ?
Comments
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
If you know you need to lop off 0.5V you will have to come up with the current draw, I, of your device so you can solve for R=0.5/I
Alternative: You could put a switching diode in series with the device. A switching diode like th 1N4148 will drop about 0.7V. That might be too much. A signal diode may drop a little less voltage but might not be able to handle the current your device draws. Again we're back to current draw...
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I wouldn't connect that if I were you...
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