Hobby Electronics Basics

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Relay delay circuit?

I need to make a relay switch on 1 second after a 12VDC line comes on, but switch off immediately the 12VDC goes off. W...
13 comments posted 19yrs
posted by none
13 comments posted 19yrs posted by none

Isolation transformer

I'm trying to find out why these are used as safety precautions in servicing mains connected equipment. Seems to me tha...
66 comments posted 19yrs
posted by spamfree
66 comments posted 19yrs posted by spamfree

Ferrite Rods (or work alikes)

This looks like a pretty cool circuit: http://www.redcircuits.com/Page55.htm However, where would I purchase a set of f...
35 comments posted 19yrs
posted by blahbleh666
35 comments posted 19yrs posted by blahbleh666

pc boards suitable for 40 pin DIPs

Hello to the group, I am looking for a way to get pc boards that will allow me to mount a 40 pin micro, and still have...
5 comments posted 19yrs
posted by nuisancewildlife
5 comments posted 19yrs posted by nuisancewildlife

Beginning Oscilloscope Question

I just received an oscilloscope I bought off eBay. I'm trying to test it but can't seem to get any vertical deflection....
25 comments posted 19yrs
posted by rpsommers
25 comments posted 19yrs posted by rpsommers

measring circuit

help me, i want to measure the temperature of seven points, and then display one by one or all together on a display ,...
2 comments posted 19yrs
posted by mavi0249
2 comments posted 19yrs posted by mavi0249

Interfacing FM receiver to PC thro'USB port

I want to interface my FM receiver board to My PC through USB port.If any one have an idea about that please provide me....
1 comments posted 19yrs
posted by karthik_eeeng
1 comments posted 19yrs posted by karthik_eeeng

heat wire used in soldering iron

I had an hold cheap iron and I tore it apart. Essentially it uses a wire wrapped around a ceramic cylinder with another...
17 comments posted 19yrs
posted by Jon_Slaughter
17 comments posted 19yrs posted by Jon_Slaughter

Open Challenge

Fix ? it ? Find it - & I will not pay for it if it is not Right? Just a Question? Any electronics Question(s) ? with re...
3 comments posted 19yrs
posted by quark5
3 comments posted 19yrs posted by quark5

Connecting Ethernet device to PLC chipset

Hello all, I have developed an Ethernet solution and I am hoping to be able to connect it to a HomePlug chipset. The de...
0 comments posted 19yrs
posted by npalmius
0 comments posted 19yrs posted by npalmius

Multimeter woes

Hi, not sure if anyone can help me but I am just starting out in electronics. I have bought a multimeter so I can go th...
20 comments posted 19yrs
posted by dean
20 comments posted 19yrs posted by dean

radio - testers needed !!

I need testers to test this new independent stream... http://www.nikmook.com/cgi-bin/listen.pls conection kindly apricia...
2 comments posted 19yrs
posted by matthieu_in_hk
2 comments posted 19yrs posted by matthieu_in_hk

RL parallel circuits

I have an RL parallel circuit. The AC voltage is 120 and the frequency is 60 Hz. One branch has a resistor (60 ohms) an...
2 comments posted 19yrs
posted by conrad
2 comments posted 19yrs posted by conrad