Hobby Electronics Basics

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Work bench for electronics

My room is getting cluttered with electronics stuff and I'd like to get it organized. Is it worth investing in an elect...
33 comments posted 20yrs
posted by orangepic
33 comments posted 20yrs posted by orangepic

ultra-newbie: picking a first microcontroller?

I'd like to build an embedded device that takes in a thermocouple input, and then, if the temperature is below the user...
21 comments posted 20yrs
posted by mrdarrett
21 comments posted 20yrs posted by mrdarrett

+120V

If a wire is at +120V does it have more electrons or fewer than a wire of equal size at ground?
4 comments posted 20yrs
posted by bob
4 comments posted 20yrs posted by bob

op amps wont zero

I have a pair of TL071s running as follower with gain. The second 071 uses 1k trimpot on 1-5 to offset. Inverting input...
2 comments posted 20yrs
posted by logicon
2 comments posted 20yrs posted by logicon

Using DMM battery to power sensor?

I want to build the gauss meter mentioned in another thread, and would like to make it self-contained (ie, no external...
4 comments posted 20yrs
posted by a
4 comments posted 20yrs posted by a

homemade solenoid coil

hi folks, i'm having some really bizarre behavior out of a homemade solenoid, please read and help! i've got some reall...
9 comments posted 20yrs
posted by webnews1
9 comments posted 20yrs posted by webnews1

Checking a transformer?

My brother has an amplifier to his stereo and it stopped working. There is nothing happening anywhere when its turned o...
5 comments posted 20yrs
posted by clannorm
5 comments posted 20yrs posted by clannorm

Impedance Low/High

I seem to be real slow in grasping these simple concepts. Another question on Impedance. What is low impedance? and wha...
33 comments posted 20yrs
posted by uriahsky
33 comments posted 20yrs posted by uriahsky

Parallel LED strings w/ constant current source

Sorry if this has been covered already; I couldn't find an exact answer in searching... I would like to drive multiple...
4 comments posted 20yrs
posted by speedytahiti
4 comments posted 20yrs posted by speedytahiti

difference between two AC voltage regulators?

I have a cheap voltage regulator APC LE1200. http://apc.com/products/family/index.cfm?id=67 Apparently it has helped st...
1 comments posted 20yrs
posted by jdoe
1 comments posted 20yrs posted by jdoe

how does a voltage regulator work?

I was browsing the web, and found this: http://electronics.howstuffworks.com/digital-electronics4.htm "The 7805 takes i...
12 comments posted 20yrs
posted by mrdarrett
12 comments posted 20yrs posted by mrdarrett

What would a burnt out PIC do?

Hello, I'm working on a little project with a PIC microcontroller and I think that I might be overheating the chip when...
7 comments posted 20yrs
posted by brickwalden
7 comments posted 20yrs posted by brickwalden

Relay to switch HVAC Unit

I want to be able to switch an HVAC unit on/off. The unit is 220V AC. With the compressor on the unit draws about 8 amp...
11 comments posted 20yrs
posted by N
11 comments posted 20yrs posted by N

[DC ASIC] Why more area == good timing?

Hi all, My friend told me if you want to get good timing, you have to make the ASIC with more area, is it right? By the...
5 comments posted 20yrs
posted by zhushenli
5 comments posted 20yrs posted by zhushenli

Powering a breadboard

I am completely new to electronics and just picked up a breadboard. I have a 12 volt power supply with a 2.5mm plug tha...
11 comments posted 20yrs
posted by billjwebb
11 comments posted 20yrs posted by billjwebb