Hobby Electronics Basics

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Building a USB keyboard

I need to build an external USB (or PS2 if that's somehow easier) computer keyboard around a Dell Inspiron 8100 replace...
15 comments posted 21yrs
posted by dave
15 comments posted 21yrs posted by dave

LED bargraphs

hello everybody i learnt from the forum that it is probably easiest to implement a LED bargraph by means of an LM39xx.....
2 comments posted 21yrs
posted by robertrobertrobert
2 comments posted 21yrs posted by robertrobertrobert

recording from gas water and electricity meters

My electronic knowledge is stuck somewhere back in the 1960's so please bear with me. I'd like to monitor my household...
4 comments posted 21yrs
posted by http://www.environmentalconsul
4 comments posted 21yrs posted by http://www.environmentalconsul

Need help with current sensing circuits

Hello! I was wondering if anyone has or knows where I can find a simple, cheap current sensing circuit that I could use...
11 comments posted 21yrs
posted by pdebella
11 comments posted 21yrs posted by pdebella

Maximum Power Transfer

Dear all experts, 1) If i were to connect a simple circuit to determine the effects of capacitance in Maxim Power Trans...
2 comments posted 21yrs
posted by albertleng
2 comments posted 21yrs posted by albertleng

555 Timer

What happens to the output voltage when the 555 timer supplies higher current? how good is the program multisim? Would i...
3 comments posted 21yrs
posted by stillbreezy
3 comments posted 21yrs posted by stillbreezy

compararos

wouls a sinusoidal input to a comparator produce the same transfer curve as a triangle waveform
1 comments posted 21yrs
posted by stillbreezy
1 comments posted 21yrs posted by stillbreezy

Find uses for this device:

I've developed a small device that trips a circuit if its power consumption goes outside a bound. There are quite a few...
7 comments posted 21yrs
posted by siliconmike
7 comments posted 21yrs posted by siliconmike

Can epia be run off generic batteries?

I'm wishing to make a DIY subnotebook, if possible. It'd use generic batteries, a monochrome display, a laptop keyboard...
8 comments posted 21yrs
posted by casioculture
8 comments posted 21yrs posted by casioculture

How to measure a small change in resistance?

I'm looking for a way to measure a small change in resistance (not necessarily a small resistance, just a small change)...
1 comments posted 21yrs
posted by davidd31415
1 comments posted 21yrs posted by davidd31415

VDA layout

Greeting all, I would like to know if anyone has any info on a video distribution amplifier, such as the PCB layout or...
5 comments posted 21yrs
posted by cynabar
5 comments posted 21yrs posted by cynabar

Inverters

Can anyone tell me if an inverter actually uses additional energy to convert DC to AC? Is it a percentage in direct prop...
2 comments posted 21yrs
posted by boblinfortino
2 comments posted 21yrs posted by boblinfortino

difference between anode and cathode?

Hi - I thing the single thing that causes me the most problems with electronic devices is polarities. Right now the thi...
12 comments posted 21yrs
posted by mnoone.uiuc.edu
12 comments posted 21yrs posted by mnoone.uiuc.edu