Hobby Electronics Basics

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Filling station

hi, I was hoping somebody out there could give me some ideas on an automatic filling system that i'm trying to create.I...
5 comments posted 19yrs
posted by rose80
5 comments posted 19yrs posted by rose80

Dell FP Monitor screwing-up sleep mode on Mac

I just got as a gift a Dell 2407WFP Monitor to use with my Mac G5. The monitor has a built-in USB hub & universal USB m...
0 comments posted 19yrs
posted by N
0 comments posted 19yrs posted by N

Problems with 7400 series floating high

Hi, I'm quite new to electronics, in the penultimate year at school, quite good with computers and wanting to teach mys...
5 comments posted 19yrs
posted by loikratong
5 comments posted 19yrs posted by loikratong

LT Spice or Visual Spice?

I'm a rank amateur that would like to begin learning a simulation package to aid my understand of basic electronics. I...
3 comments posted 19yrs
posted by luv2fly99
3 comments posted 19yrs posted by luv2fly99

electron and hole mass

how can we consider electron and hole masses as different??how are they equal??isnt a hole supposed to be imaginary??
5 comments posted 19yrs
posted by strider014
5 comments posted 19yrs posted by strider014

UV LED in development

I'm building a cheap UV exposure frame using a gutted flat scanner unit and putting in a UV setup so that UV light will...
6 comments posted 19yrs
posted by noen
6 comments posted 19yrs posted by noen

Help: Connecting Leads to Pins

I am working on a project and want to incorporate some single row terminal blocks. I'm trying to figure out the best wa...
23 comments posted 19yrs
posted by Searcher7
23 comments posted 19yrs posted by Searcher7

visible light frequency generator

I was just wondering if there are standard frequency generators that can create frequencies all the way up to visible li...
3 comments posted 19yrs
posted by bob
3 comments posted 19yrs posted by bob

555/556 Timer Circuit

I'm kind of new to this electronics stuff. I took a class years ago and have a pretty good idea of how basic circuits w...
4 comments posted 19yrs
posted by piscatory
4 comments posted 19yrs posted by piscatory

Making a good ground

I had always heard that a cold water pipe makes a good electrical ground. If copper, use a copper clamp and if steel us...
8 comments posted 19yrs
posted by spammenot
8 comments posted 19yrs posted by spammenot

Part substitution

I want to build this PWM circuit, and I have no 100k pot. Can I substitute a 10k pot and a 1uf cap for timing, or are t...
2 comments posted 19yrs
posted by randy.day
2 comments posted 19yrs posted by randy.day

An RF question

After listening to the RF interference radiated from a PDA on a portable radio it got me to thinking. When pulses are s...
2 comments posted 19yrs
posted by etpm
2 comments posted 19yrs posted by etpm

resonant frequency

When a system is driven by a wave at its resonant frequency, how does the shape of the wave come into play? For instanc...
6 comments posted 19yrs
posted by mike7411
6 comments posted 19yrs posted by mike7411

connect simple button through rs-232

Hello. I want to send a signal through serial connection by pressing simple button. (I use vvvv software which operates...
3 comments posted 19yrs
posted by bare.xld
3 comments posted 19yrs posted by bare.xld