Electronics Forum / Basics / April 2007

I would like to measure the resistance (impedance) of a soldering iron tip
to ground with power on - When I use a standard ohm meter I am getting
fictitous readings.
With no power I get a 1 ohm (typcical)dc resistance.  When I power I get

I would like to make a small timed alarm to gift a friend. What I have
in mind is an input consisting of 3 'up arrow-marked' buttons so that
the user can cycle through all values of input (hours, minutes and
seconds). Then, when user presses the alarm enable button, this value

Hi People.
I am looking at a particular application. I want to build a currency
counter. The device will be based on optical technology. What I want
to do is, "look" at the side of the stack of banknotes and from there,