Electronics Forum / Basics / January 2008

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Which instruments can I use to test capacitance and resistance in
circuit?

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I am looking for a piece of hobby electronics I had in 1978 and this
seemed to be a good place to ask. It was a black box with four or five
toggle switches on the side. When the switches were thrown the box
would make various chirping, squeaking, and siren sounds. I got it at

Would appreciate some help.
Was thinking of using a car radio at home. Specs read current
consumption 1.5A (at .5W).
The fuse is 5A.

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The power equations P = VI = I^2 R = V^2 / R  work for dc signals and
ac sine signals if we use RMS values (peak / root2).
Now what if we have different shapes signals?  Square wave is
obvious.  What about triangle wave?

I've been off doing other things for a year or two, and have recently been
monitoring this group again. The spam problem is much worse than it was.
Does anybody have a good algorithm for marking it, or a suggestion for a
program to do that without generating too many false ...

As an assignment I have to design a CCD Sensor based FPGA digital
Camera. However, the Camera will be exposed to XRAY (It will be placed
behind an Imaging Intensifier). Does anybody know how XRAY affects the
electronic circuits (The CCD Sensor and the FPGA ). What type of noise

I have a Radio Shack frequency counter (#22-305), with two frequency
ranges and a digital pulse mode.  Its input is a 50 ohm BNC connector.
Can someone suggest a suitable inductive pickup for this to wrap
around a spark plug wire that will provide a signal that is not too

Hi - forgive me I'm a mechnical guy with limited electrical knowledge.: )
I noticed cell phone batteries have small circuit boards at the end of the
pack.  What is the purpose of the board?
I am being tasked with a project using arrays of larger lithium cells - I

I pulled an old part out of the junk
drawer, and I'd like to find some info
on it.
I seem to recall it being a Hall Effect

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I just bought a dirt-cheap wireless lapel microphone with
transmitter and receiver.  But, I think there may be a problem with
battery life.
The transmitter is powered by a 9V alkaline battery, and I rigged it

I know very little to nothing about motors. I am looking to get a
motor to help improve my grain mill (I'm a homebrewer).
What I know I need is this:
1750 rpm