I have recently gotten in the habit of taking off electronic components from motherboards, circuit boards, etc. and I want to know what the capacitance is of the capacitors I take off.

Any help?

Hi,

I’m building a simple circuit with two 4000 series logic ICs, an LDR and a buzzer amongst a couple of other things.

I’m not sure what type of capacitors to buy to go in it.
I need a 0.001 mf, a 10mf, and a 100mf capacitor but am not sure what type.

Please could you provide a link from this site:

http://www.rapidonline.com/Electronic-Components/Capacitors

of the type of capacitor I should buy. I am thinking electrolytic?

Thank you very much.

Froskoy.

Hi, i’m having a little trouble. A schematic diagram of a 3-band equalizer is on this link: http://freecircuitdiagram.com/2008/11/25/3-band-graphic-equalizer-circuit/

Here’s a story. I went to a local electronic shop to buy the parts needed for that 3-band equalizer. When I asked the vendor for the capacitors, he asked me, "how much is the voltage? what kind of capacitor do you need?" and i just said, "i don’t know". The supply needed is 12V DC and the values of the capacitors are:

0.1uF
47nF
4.7nF
0.47nF
22nF
1nF
33uF

I’m sorry but I’m such a noob at this, but I’d really really appreciate it if anyone can help or tell me if there’s some sort of formula for this.

Thank You very much

I have small battery powered electronic toy that makes sound. I would like to amplify the sound to make it louder. I have a very basic knowledge of electronics, so I could add small capacitors or resistors to some wires, but anything involving complicated circuit boards or actually rewiring the toy itself are pretty much out of the question. Thanks…

I want a user friendly software that uses a drag and drop approach to design a electronic circuit, measure current or voltage between any points, some basic components in it like resistors, transistors, capacitors etc… Do you know any software like that?
Sheldon, i wanted a drag and drop type software. not a programming software..

and Blackstreet you dipshit, your software doesnt allow me to test the circuit.. it allows me only to build it and chuck it out of window.
All these dipshits got the answer wrong.
All of these are only drawing software. But i wanted a software with which you can test the actual circuit.

Yes, I am making something like electronic jewellery that can be used as as a warning.

Each circuit has to have two LEDs of different colour, mine is green and red. The circuit got to have resisters, capacitors, semiconductor devices and battery snap. I could add something different to it, but I have as well as to justify it.

Can you give me some ideas?

Hi everyone, I am interested in learning how to build electronic devices such as radio controlled cars, flashing lights, anything. I would like it if anyone could post good books, tuts, online lessons, and dvds.
I want stuff that starts from the very beginning that teaches how capacitors, transistor, Integrated circuits, micro-controllers, anything of the sort, works. I know nothing about electronics and would like to learn thanks.

I’m learning programming for the first time (starting with C for beginner) but I first I want to understand exactly what happens when I type the key, let’s say "b" on my keyboard and seeing letter "b" appear on a notepad for instance.

My guess is this and I’m not sure to what extent it is correct:

First, a computer is, physically speaking, nothing but electricity and circuitry (matter; electronic components such as resistors, capacitors etc and electrical power which comes from the battery/wall and finally the way all these are connected to one another)

1. The keyboard, being an electronic device, needs electricity in order to work so it is powered by the computer through the USB port.

2. By pressing any key ("be" in our case), I’m actually closing a circuit which makes some current/voltage flow (high for 1 and low for 0)

3. Some programs (Operating system which then communicates to notepad God knows how) convert this series of high’s and low’s or 0’s and 1’s into what I see on my screen as letter "b" on the notepad.

Am I close to the reality of computing?

I mean how does the computer know that I have actually pressed the key "b" on the keyboard and not "a", does every key send some sort of special current or something? This part I need clarifying the most!

Does this have anything to do with "Hex"?

Thank you.
where does the processor come into play in all of this? my processor is 2 GHz, what does this mean in terms of typing and seeing something on the screen?

The resistors are all labeled with R# and it seems the capacitors are named accordingly with C#. What could a part with the labeling D2 be? it looks like a black cylinder with 2 small metal pieces holding it slightly above the board.
any help is greatly appreciated .

oh ya, and its a LCD power supply, looked for the schematic but couldn’t find it.

I’m building a simple FM transmitter. circuit is here… http://www.electronics-lab.com/projects/rf/030/index.html
the problem is i couldnt find one of the capacitor 100nF in any of my neghboring shops… is there any other choice like can i use other capacitors like 0.01uF o somethin????
another question…. I dint get the trimming capacitor 0-45pF but i got 0-22pF two. can i mount them iin parallel in place of that single 45pf trimming capacitor….
Guys please help me out…