Hobby Electronics Basics

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Driving a big LED with a MOSFET

I'm trying to drive a big LED (3W) with a MOSFET. Eventually I want to drive it with an Arduino but so far I'm failing...
25 comments posted 14yrs
posted by tooby
25 comments posted 14yrs posted by tooby

Charging an alarm battery

I have a Xantrex 12v rechargeable 600 Power Pack battery. Yesterday I charged it up and then attached a 12v smaller ala...
4 comments posted 14yrs
posted by wolftracks
4 comments posted 14yrs posted by wolftracks

*small* spark generator

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to b...
20 comments posted 14yrs
posted by scott.a.mayo
20 comments posted 14yrs posted by scott.a.mayo

Burnt out Electric Fence Tape

Hi guys, Anyone got any answers to an odd phenomena i've seen with an electric fence tape. The tape in 1/2 inch wide in...
5 comments posted 14yrs
posted by Terminal_Crazy
5 comments posted 14yrs posted by Terminal_Crazy

Step Up Pre Coil/Transformer

OK Honda no longer makes the original ignition coil that steps up the voltage by 3 -4 orders of magnitude. What's the e...
3 comments posted 14yrs
posted by BretCahill
3 comments posted 14yrs posted by BretCahill

Tesla generator

Has anyone actually made one of these out of four diodes and four capacitors. If so how much aerial is needed and what v...
0 comments posted 14yrs
posted by dewhurst.roger
0 comments posted 14yrs posted by dewhurst.roger

Curious about white LED circuit

I bought a few surplus pc boards that contain 29 LEDs and some resistors. 13" long x 2" wide. The wiring seems odd, the...
3 comments posted 14yrs
posted by amdx
3 comments posted 14yrs posted by amdx

OT: Oooops!

Oooops! Technology has caught up with me... Looks like the modern world of home theater all talks HDMI. (All my present...
5 comments posted 14yrs
posted by To-Email-Use-The-Envelope-Icon
5 comments posted 14yrs posted by To-Email-Use-The-Envelope-Icon

Where do I find this part?

Where do I find this part?.... http://www.analog-innovations.com/SED/RubberFoot.jpg It's a rubber cabinet foot, made in...
10 comments posted 14yrs
posted by To-Email-Use-The-Envelope-Icon
10 comments posted 14yrs posted by To-Email-Use-The-Envelope-Icon

orbital shells and energy levels

High school and undergrad physics teaches that electrons change energy levels when they emit or absorb a photon. They a...
5 comments posted 14yrs
posted by td_03
5 comments posted 14yrs posted by td_03

equation: dBm to mW/cm^2

I have a 1 GHz 1/4 W whip driving a detector that outputs RF level data as a D.C. reading that is easily convertible to...
26 comments posted 14yrs
posted by Winston
26 comments posted 14yrs posted by Winston

Photon counting for the masses

Photon counting for the masses. Last Friday on SEB someone asked about the reverse bias voltages for LEDs. So I thought...
395 comments posted 14yrs
posted by gherold
395 comments posted 14yrs posted by gherold