Hobby Electronics Basics

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Quicky circuit

Suppose I have a transformer with an output of 13.8v (sort of thing that powers a CB) and I want to take it down to 12v...
12 comments posted 20yrs
posted by grahame9
12 comments posted 20yrs posted by grahame9

laser pointer

can i make a laser pointer from an old cd player? i tore it apart and found this tiny board mounted with a small compon...
5 comments posted 20yrs
posted by sb2004
5 comments posted 20yrs posted by sb2004

PCP Prototyping

I'm looking into making one-off PCBs at home (I'm in the UK). My interest is in making small boards (say, up to 2x4") t...
11 comments posted 20yrs
posted by a
11 comments posted 20yrs posted by a

some basic question about communication

why do we go for modulation?what r the advantages of using high frequency carrier wave? how does a high frequency wave t...
9 comments posted 20yrs
posted by pradheep.sh
9 comments posted 20yrs posted by pradheep.sh

Help! Transformer-less powersupply

Could anybody help me on how to design a mosfet based powersupply, naturally, requiring no transformer....
8 comments posted 20yrs
posted by acorreya
8 comments posted 20yrs posted by acorreya

To School or Not To School?

Alright... Lately (yet again) I've been considering returning to school. Off and on since I've gotten my now unused AOS...
12 comments posted 20yrs
posted by blahbleh666
12 comments posted 20yrs posted by blahbleh666

Electric Problem - UPDATE!

Hi All, I have been examining a wiring diagram of my bike which I had studied at length before but I couldn't even work...
1 comments posted 20yrs
posted by jk
1 comments posted 20yrs posted by jk

yahoo help

I DONT KNOW IF YOU CAN HELP ME OR NOT BUT I HAVE A QUESTION. WHEN I TRY TO IM SOMEBODY THEY CANSEE WHAT I WRITE BUT I CA...
2 comments posted 20yrs
posted by michaelcrutchfield64
2 comments posted 20yrs posted by michaelcrutchfield64

robot sensors

Hi I have a project that I'm doing now. I want to build a robot (on wheel) that would cover a predetermind floor area....
1 comments posted 20yrs
posted by lerameur
1 comments posted 20yrs posted by lerameur

basic question about "switching power supplies"

hi all - sorry if this is trival but not found much useful info.... I have many devices whos power supplies have such i...
4 comments posted 20yrs
posted by gavin
4 comments posted 20yrs posted by gavin

flash charging circuit (flyback oscillator)

I'm looking to build a simple circuit such as those found in cheap disposable cameras to charge the flash capacitor. Wh...
3 comments posted 20yrs
posted by whitecollar
3 comments posted 20yrs posted by whitecollar