Hobby Electronics Basics

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555 timer: why won't this work

ok, thank you all for your help. I just bought a brand new 555 IC, plugged it in, and still this thing doesn't work. th...
11 comments posted 20yrs
posted by randomname12345
11 comments posted 20yrs posted by randomname12345

motor drivers

I have a question about motor drivers/speed controllers. Where do you find out the info on how many motors can be contr...
7 comments posted 20yrs
posted by quanghoc
7 comments posted 20yrs posted by quanghoc

Digital Monostable

Hi, 1) Is there any equivalent to monostable in fully digital electronics (logic gates)? I am trying to trigger a pulse...
1 comments posted 20yrs
posted by cooldude65
1 comments posted 20yrs posted by cooldude65

power on delay using a 555 chip

Hello, Is it possible to give a delay of 20mins upon power on before a LM555 can be used as a oscillator in its astable...
15 comments posted 20yrs
posted by kfel
15 comments posted 20yrs posted by kfel

Ammeter

I bought me a big old 5A AC ammeter. (8" x 8") I must admit I bought it thinking it was DC, but hey, I really only want...
4 comments posted 20yrs
posted by johnriley11
4 comments posted 20yrs posted by johnriley11

555 timer

hello everyone, ive posted about this in "design" which i found out was the wrong group. heres the deal: im trying to m...
25 comments posted 20yrs
posted by randomname12345
25 comments posted 20yrs posted by randomname12345

Interface device

I need to be able to send and recieve data from a custom electronic board to my computer program (written in c). from w...
2 comments posted 20yrs
posted by jkacen
2 comments posted 20yrs posted by jkacen

NiMH battery pack

I have a number of 4 cell, 4.8V NiMH mobile phone batteries that I want to string together to make a larger battery pac...
0 comments posted 20yrs
posted by johnriley11
0 comments posted 20yrs posted by johnriley11

Crystals vs Oscillators vs Resonators

Can you tell me the differences and similarities among Crystals vs Oscillators vs Resonators? In term of: + Functionali...
11 comments posted 20yrs
posted by quanghoc
11 comments posted 20yrs posted by quanghoc

Stranding?

Can someone help me to explain the term "Stranding? http://bwccat.belden.com/ecat/pdf/9265.pdf What does 7x30 mean? What...
42 comments posted 20yrs
posted by quanghoc
42 comments posted 20yrs posted by quanghoc

measuring a reference signal

What is the best device for measuring a reference signal (i.e. 10 MHz) to verify it's accuracy? Thanks.
3 comments posted 20yrs
posted by mike7411
3 comments posted 20yrs posted by mike7411

Small headphone amplifier

I need to slightly amplify audio from my PC sound card to mono headphones. This is for use with Skype (VOIP) so it does...
1 comments posted 20yrs
posted by sorry
1 comments posted 20yrs posted by sorry

Capacitor orientation

Simple question...Do ceramic capacitors have to be oriented in a specific way like electrolytic do? positive/negative ??...
5 comments posted 20yrs
posted by lmcgill2
5 comments posted 20yrs posted by lmcgill2