Hobby Electronics Basics

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12V 4amp pwr supply

Good day I have on of those Colman coolers the pwr supply is not working. The pwr supply is rated at 12 volts 4 amp. I...
3 comments posted 17yrs
posted by rickj
3 comments posted 17yrs posted by rickj

Full H-Bridge Driver IC

Anyone know of a relatively cheap full bridge driver that has a built in PWM that can be programmed using I2C or through...
0 comments posted 17yrs
posted by Jon_Slaughter
0 comments posted 17yrs posted by Jon_Slaughter

Curiosity

Just curious here. I managed to break the tiny coaxial connector on my express card TV tuner. Decided to remove the con...
2 comments posted 17yrs
posted by Periproct
2 comments posted 17yrs posted by Periproct

Help newbie!

Hi! I am in last year of high and want to study for Telecommunications Engeenering in university. What books or tutoria...
18 comments posted 17yrs
posted by eltoni.91
18 comments posted 17yrs posted by eltoni.91

spectrometer

Hi everybody, I'm trying to make something for "analysing" light spectrum. I'm interrested in hight UV band (350 - 420...
3 comments posted 17yrs
posted by g.bon2
3 comments posted 17yrs posted by g.bon2

555

When a 555 is wired as a 1 Hz square wave oscillator and pin 4 goes high does pin 3 go high at the same instant or does...
11 comments posted 17yrs
posted by dewhurst
11 comments posted 17yrs posted by dewhurst

usb output

Anyone know how much voltage a Usb port outputs? I am trying to recharge a mp3 player via the port, but it takes too lo...
6 comments posted 17yrs
posted by kvsteve
6 comments posted 17yrs posted by kvsteve

Nanosolar Power - Home-made cells?

I've seen from the web several models for producing nanosolar cells. As far as I understood, these kind of solar cells...
5 comments posted 17yrs
posted by asandcrab
5 comments posted 17yrs posted by asandcrab

Voltage limiter for a guitar distortion circuit

Hey guys, I'm trying to design my first guitar pedal. Distortion is created when an AC wave's amplitude is greater than...
3 comments posted 17yrs
posted by ngdbud
3 comments posted 17yrs posted by ngdbud

120V DC panel indicator question

Can anyone recommend a panel indicator... it could be LED or Neon bulb, or incandescent.... I've only used LEDs and onl...
5 comments posted 17yrs
posted by panfilero
5 comments posted 17yrs posted by panfilero

why does a car battery spark

I'm trying to figure out what are the paramters that cause a spark.... a visible spark. For example, if I take a 9V bat...
118 comments posted 17yrs
posted by panfilero
118 comments posted 17yrs posted by panfilero

Battery Pack Dead

Anyone know why a 24 Drill battery pack would read 0mV overall and for every NiCd cell? No open cells since the total r...
5 comments posted 17yrs
posted by Jon_Slaughter
5 comments posted 17yrs posted by Jon_Slaughter

need a quick ultrasonic noisemaker

For the neighbor's dog. Heard about the ultrasonic noisemakers that are triggered by a dog's bark, but at $50 and sever...
13 comments posted 17yrs
posted by mrdarrett
13 comments posted 17yrs posted by mrdarrett

Understanding simple voltage divider

Hi I understand the mathematical equation for voltage dividers I just don't understand why the voltage drops ... Can any...
11 comments posted 17yrs
posted by first10
11 comments posted 17yrs posted by first10