Hobby Electronics Basics

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Solder tack time?

Hi, What is solder tack time? I was looking at solder paste and it states that it has a tack time of 4-8 hours. Thanks!
1 comments posted 20yrs
posted by bigschlong
1 comments posted 20yrs posted by bigschlong

Memory capacitors

What are the general rules of thumb re memory capacitors and voltage retention when power is switched off? Is a higher...
8 comments posted 20yrs
posted by mattgyma
8 comments posted 20yrs posted by mattgyma

Current and PCB Traces

How much current can, in general, a pcb trace withstand? Is there any general guidelines that I need to be aware of so...
15 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
15 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

LED Help

Hi I need some advice on how to go about lighting up a picture made from stained glass. The frame is approximately 24"...
2 comments posted 20yrs
posted by dillinger1999
2 comments posted 20yrs posted by dillinger1999

Voltage Regulators

I'm tried to do my ps but I'm having some problems. I ended up burning out one of the regulators for some reason but th...
15 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
15 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

nicad and ordinary battery

I have opened an ordinary battery to get the carbon rod and the black powdery stuff around it stained my drawer. I had...
1 comments posted 20yrs
posted by eswnl
1 comments posted 20yrs posted by eswnl

Ohm's law power formula question

Ok, using ohm's law, in a DC circuit, we can say that: power= (V^2)/R I^2 * R V * I But what if you have a one ohm resi...
6 comments posted 20yrs
posted by itsme.ultimate
6 comments posted 20yrs posted by itsme.ultimate

car stereo mains

How would I go about powering a car stereo from the mains? I'm guessing the most logical way is to get some sort of tra...
8 comments posted 20yrs
posted by will_usher
8 comments posted 20yrs posted by will_usher

looking for learning sites

Hi all, Can anybody point me to some good electronic circuit learning sites with projects i can build and a good explana...
1 comments posted 20yrs
posted by rickd_65
1 comments posted 20yrs posted by rickd_65

Speaker impedance - explain?

Can someone explain to me exactly what speaker impedance is? Also, Why is it only 4, 8, etc. ohm? (such even numbers).
14 comments posted 20yrs
posted by aheyn
14 comments posted 20yrs posted by aheyn

Transistors common what?

Hello group, Is there a "rule of thumb" to choose which set-up for a transistor........ common base, common emitter, or...
2 comments posted 20yrs
posted by bborb
2 comments posted 20yrs posted by bborb

Respiratory Circuit

i am tryin to derive the respiratory rate from the chest leads but i am gettin a lot of noise. also, i am not able to d...
2 comments posted 20yrs
posted by avm007
2 comments posted 20yrs posted by avm007

Building a basic USB device?

Greetings, all. I have a requirement for getting some external sensor-data (possibly analogue, possible digital, not su...
8 comments posted 20yrs
posted by cylindric
8 comments posted 20yrs posted by cylindric