Hobby Electronics Basics

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staticstical fluctuations

Quote: " As the number of electrons N decreases, the statistical fluctualtions in the number becomes an increasing frac...
3 comments posted 20yrs
posted by patrick.zou
3 comments posted 20yrs posted by patrick.zou

4017 driving multiple LEDs

I need a circuit which lights 4 LEDs upon 4 pulses on input. 4017 CMOS counter/decoder seems the obvious choice here, a...
2 comments posted 20yrs
posted by pstnly
2 comments posted 20yrs posted by pstnly

Two questions on voltage regulators

If have a circuit that needs 5V, and I have a battery that generates 9V, I can wire a couple of resisters into a voltag...
9 comments posted 20yrs
posted by jdege
9 comments posted 20yrs posted by jdege

Making three-way audio switch

Hello all, This is my first post in this group. I want to make an audio input switch for my stero system at home. My so...
1 comments posted 20yrs
posted by dg
1 comments posted 20yrs posted by dg

Surface mount OK for amateurs?

Is SMT a practical proposition for the occasional kit builder? Seems like a fair bit of investment - special tools and...
5 comments posted 20yrs
posted by jwprincic
5 comments posted 20yrs posted by jwprincic

speaker Control Pod very hot

https://www.cambridgesoundworks.com/store/category.cgi?category=spk_multimedia&item=l1il3500 If you're familiar with Cr...
0 comments posted 20yrs
posted by jdoe
0 comments posted 20yrs posted by jdoe

most appropriate high speed interface

Hello community, I am a student of electrical engineering and in the course of a laboratory I am currently designing a...
1 comments posted 20yrs
posted by quinn_the_esquimo
1 comments posted 20yrs posted by quinn_the_esquimo

Infrared RC oscillator

So many of the xmtr circuits I've seen for infrared remote control use a crystal or ceramic resonator in a cmos oscilla...
6 comments posted 20yrs
posted by newszz10
6 comments posted 20yrs posted by newszz10

cell (mobile) phone scrambler jammer

Can anyone offer some tips on building a cell phone jammer. There are apparently no laws about this (yet) in the countr...
21 comments posted 20yrs
posted by dlwebb
21 comments posted 20yrs posted by dlwebb

What does isolation actually mean?

Just about every time I see the word transformer I see the work "electrical isolation" but I really have no idea what i...
12 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
12 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

ultrasound transducer interface circuit

Hello, I am wondering how ultrasound transducers are interfaced to electronic circuit in a ultrasound imaging system. W...
2 comments posted 20yrs
posted by ma
2 comments posted 20yrs posted by ma

voltage regulator for very old motorbikes

I join my two hobbies, electronics and antique motor vehicles, by doing electronic retrofits and upgrades on old vehicl...
7 comments posted 20yrs
posted by kellrobinson
7 comments posted 20yrs posted by kellrobinson

Basic Wiring Question

I'm trying my first DIY electronics project. Here it is: http://www.venturelighting.com/images/Wiring_X1_big.gif I don'...
2 comments posted 20yrs
posted by Smapple
2 comments posted 20yrs posted by Smapple