Hobby Electronics Basics

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photodiode: photovoltaic vs photoconductive

Three questions: 1) On a photodiode data sheet, you see the spectral response (i.e. responsitivity in A/W vs the wavele...
2 comments posted 19yrs
posted by usefulfacts
2 comments posted 19yrs posted by usefulfacts

more noob questions - transformers

Ok ... try not to laugh when i ask... tho i only have a few questions on designing a home made transformer.. And of cou...
5 comments posted 19yrs
posted by caltus
5 comments posted 19yrs posted by caltus

Multicore shielded cable in the US

Once upon a time this was easy to get in small quantities (25' - 100') but now it seems like 500' or more is the norm....
3 comments posted 19yrs
posted by oparr
3 comments posted 19yrs posted by oparr

Can I replace NiCad with NiMH?

I have some rechargable wireless headphones that I use on the treadmill. The NiCads have developed so much memory that...
8 comments posted 19yrs
posted by Mitch
8 comments posted 19yrs posted by Mitch

RF Transformers Lead Colors

Hello everyone, I need to use a RF Transformer in a TV circuit, But i can't find it in my country, So i think to search...
0 comments posted 19yrs
posted by Abu.Oways
0 comments posted 19yrs posted by Abu.Oways

hard drive header position

Hi, I have a little project that I am undertaking that requires accurate position feedback and I thought of using a sim...
6 comments posted 19yrs
posted by Mark.Dodgson
6 comments posted 19yrs posted by Mark.Dodgson

help with simple interface circuit

I have the following scenario. I have to do an automated blinds installation. The control circuit for the blinds consis...
3 comments posted 19yrs
posted by johanwagener
3 comments posted 19yrs posted by johanwagener

microphone

i want a microphone for hearing best than my ears
1 comments posted 19yrs
posted by agustinitanuclear
1 comments posted 19yrs posted by agustinitanuclear

Can air be used as a "semiconductor"?

Hi: Why is silicon needed in the 1st place? For that matter, why any semi- conductor? Why not just use the copper elect...
17 comments posted 19yrs
posted by glucegen1
17 comments posted 19yrs posted by glucegen1

Heating Zones and simple relay?

I have a house with 5 heating zones, some radiant heat some cast iron. Each zone is controlled with a standard 24V ther...
0 comments posted 19yrs
posted by barryklawton
0 comments posted 19yrs posted by barryklawton

Dimming the light up when you get close to it?

Hi All, Many years ago I used a 741 chip (and some others that I can't remember) to create a circuit. Circuit had an an...
2 comments posted 19yrs
posted by homi_us
2 comments posted 19yrs posted by homi_us

24 bit math so I can read and write

I am writing and reading to a microcontroller. My largest allowable variables are 16 bit and 8 bit How can I write a 24...
6 comments posted 19yrs
posted by gtslabs
6 comments posted 19yrs posted by gtslabs

PC Monior issues

The screen just got faded and fuzzy at 1152 x 862 pixels, but looks great in 800- x 600 pixels. Is the monitor dying, o...
6 comments posted 19yrs
posted by john.doggett
6 comments posted 19yrs posted by john.doggett

Onine course on basics of Embedded Systems

Hi folks, Here is a free online course on Embedded Systems for entry level engineers Check this link http://www.emittsol...
1 comments posted 19yrs
posted by nsreddy
1 comments posted 19yrs posted by nsreddy

How to (ab)use a PIC ;-)

First off, big thanks to everyone for the overwhelming amount of help I received. I've been playing around with LC osci...
6 comments posted 19yrs
posted by spam-not
6 comments posted 19yrs posted by spam-not