Hobby Electronics Basics

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data communication

When the average amplitude is non zero then the problem arises is ______________????
7 comments posted 17yrs
posted by sirfmereliay
7 comments posted 17yrs posted by sirfmereliay

Optocoupler puzzle

I dug an old 4N35 out of the junk box, and wired it up two ways (below). I put ~150us pulses on pin 2, and expected to...
5 comments posted 17yrs
posted by randy.day
5 comments posted 17yrs posted by randy.day

Voltage sensing switch with deadband ideas?

I need to maintain pressure on a hydraulic system within a narrow +-3% band for some tests but the commercial precision...
4 comments posted 17yrs
posted by gashmore
4 comments posted 17yrs posted by gashmore

Hopefully simple question about DC power supplies

Hi, I'm hoping that this is a simple question to answer. Although I'm not a technical ignoramus, I know very little abo...
18 comments posted 17yrs
posted by davidburgess99
18 comments posted 17yrs posted by davidburgess99

LED and constant current supplies

I've got a bit of a mystery. I've ordered a couple of these: along with a constant current supply: The only tidbit of i...
11 comments posted 17yrs
posted by yan
11 comments posted 17yrs posted by yan

Two Column Selection Game

The non-profit org I belong to has a push-button match column A with B type of game for kids to play. The first column...
4 comments posted 17yrs
posted by tcosmas
4 comments posted 17yrs posted by tcosmas

Gold From Filter Feeders

Ingesting calcium from oyster shell suppliments is supposedly unhealthy from the high lead levels. Filter feeders conce...
29 comments posted 17yrs
posted by BretCahill
29 comments posted 17yrs posted by BretCahill

Default reply to all

Nov10 2008,6.53AM
1 comments posted 17yrs
posted by jittithap.naudom
1 comments posted 17yrs posted by jittithap.naudom

On/Off switch with a difference

Hi all, I have a machine that I'd like it to turn the coolant system off when it has finished a job as it sprays crap e...
14 comments posted 17yrs
posted by davenpete
14 comments posted 17yrs posted by davenpete

photovoltaics in parallel

I live in the woods, so my solar powered walk lights do not charge very well in the winter months. I decided to add ano...
8 comments posted 17yrs
posted by rabiticide
8 comments posted 17yrs posted by rabiticide

Stand-by power supply question

Hi people, I have a Un-Interruptible Power Supply with a dead battery. Am I correct in thinking that I could remove the...
6 comments posted 17yrs
posted by davenpete
6 comments posted 17yrs posted by davenpete

Components naming

Hello, I am curious to know how the naming of transistors and ICs are organized. Why a 2N3055 is called 2N3055 and LM741...
25 comments posted 17yrs
posted by olivier.scalbert
25 comments posted 17yrs posted by olivier.scalbert

LTSpice dependent sources symbol

I'm making some schematics on LTSpice and need a symbol for the dependent source, but not the one it includes by defaul...
2 comments posted 17yrs
posted by jerry
2 comments posted 17yrs posted by jerry

Casio NP-50 batteries

I'm not sure if this question is a bit off-topic, but I found BestBatt.com to be selling those batteries for $12 rather...
1 comments posted 17yrs
posted by stanigator
1 comments posted 17yrs posted by stanigator