Hobby Electronics Basics

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Crest factor?

I see this term in specs for UPS's. Wikipedia describes it as a ratio of RMS to peak voltage. That doesn't "grok" for m...
5 comments posted 17yrs
posted by notme
5 comments posted 17yrs posted by notme

Source for flickering LED's

Does any one have a source for flickering not flashing LED's? I'm looking for the ones that are in flameless candles. I...
3 comments posted 17yrs
posted by cknjsp
3 comments posted 17yrs posted by cknjsp

simple audio/video switch

Hi, I have a cable box with three pins on the back, constant 9VDC, GROUND, and 3VDC(when switched by remote, normally 0...
1 comments posted 17yrs
posted by JoshTmp
1 comments posted 17yrs posted by JoshTmp

electronics

i want some basic kno.. about electronics.... how the electronics chips working and whats the basic reqarnment for it......
2 comments posted 17yrs
posted by jeet.rock
2 comments posted 17yrs posted by jeet.rock

boost PFC duty ratio expression

Anyone has some idea how can i derive the expression for the small signal duty cycle for boost PFC designed for average...
0 comments posted 17yrs
posted by krishmaniac
0 comments posted 17yrs posted by krishmaniac

Diode across inputs to solenoid?

I was looking at the solenoid on a contactor today. It had a diode across the two leads and I've been wondering why. Th...
1 comments posted 17yrs
posted by clannorm
1 comments posted 17yrs posted by clannorm

Crystal Radio Questions

I'm winding a coil for a crystal radio. The original plan says to wind the antenna coil on top of the tuning coil, wher...
10 comments posted 17yrs
posted by none
10 comments posted 17yrs posted by none

rechargable batteries for solar lights

I'm generally OK with electronical things, but hardly an expert on rechargables, from reading the posts here. So, thank...
7 comments posted 17yrs
posted by gzuckier
7 comments posted 17yrs posted by gzuckier

cm choke for blocking oscillator

I want to take 1.5 volts and boost it to 5 volts. Don't need a lot of power, maybe 100mW. Common mode chokes are cheap...
7 comments posted 17yrs
posted by nospam
7 comments posted 17yrs posted by nospam

electric latch

Hi I have a one touch electric can opener (that no longer works). How it (used to) work: -Place on a can -Press switch...
7 comments posted 17yrs
posted by JohnNicolet
7 comments posted 17yrs posted by JohnNicolet

Noise in parallel

Hi, I'm having a discussion about placing two noise sources in parallel such as Johnson noise. I would appreciate it if...
12 comments posted 17yrs
posted by energymover
12 comments posted 17yrs posted by energymover

MOSFET as a switch and Rds(on)

Hello, I'm having a slight confusion over what Rds(on) means for a MOSFET. In the book it says that Rds(on) is the resi...
3 comments posted 17yrs
posted by eliben
3 comments posted 17yrs posted by eliben

Hard time finding two parts

I am hunting for two parts that seem to be hard to find. The first one, roughly pictured here: http://imgur.com/S6T3Ll&...
1 comments posted 17yrs
posted by jptdrake
1 comments posted 17yrs posted by jptdrake

Running LED from Mains power

Reading the thread on battery power with interest... Is there a minimal and cheap junk box circuit that anyone can reco...
0 comments posted 17yrs
posted by charlie
0 comments posted 17yrs posted by charlie