davidbball13

hello so i just found the best website www.allelectronics.com
and i got a bunch of new ICs the only one that i am having trouble with is the bar graph display driver. i cant find a good schematic for it and if i do it have something called a signal source i dont know what that is. do you guys have a schematic that i could use. or some help.


thank you.

david.

aibelectronics

You hardly give us sufficient information to work with?

A signal source is just what it is: A 'circuit' generating an electrical signal. It could be your power line generating 50/60HZ, it could also be a free running 555...

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davidbball13

do u guys have a schematic i could use. i dont know what i have else to say i want it to work like this http://youtube.com/watch?v=ynw254eBSeo

if u know anything else please tell me

ericgibbs

hi David.

Goto www.datasheetarchive.com and get the datasheet for the LM3914

Included in the data are applications for driving bar graph LED's

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Eric
"Good enough is Perfect"

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davidbball13

thanks ericgibbs i found the schematic on page 2 on the LM 3914 mcd data sheet
i am a little confused the 0 to 5 volt signal source

ericgibbs

hi,
The Vdc input can be derived from a number of sources.

eg: temperature sensors, audio or as in the 'movie' a simple 10K variable resistor connected between +5V and 0V, with the wiper to the input.

Does this help.?

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

davidbball13

yes i will print it out and do it (the schematic) tonight
just a quick question what website do you guys get stuff like electronic parts it is hard because i am only like 12 so i dont have a credit card or anything and radio shack does not have that much i have been using www.allelectronics.com
what do you use.

ericgibbs

Whats your location.?

I would suggest you just put your country name in your profile.
Never publish your email address on a forum or give your date of birth..

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

davidbball13

yeah i know about the hole age thing thats why i have a gun under my bed. is a 1200fps pellet gun. i live in upstate NY

davidbball13

what is the wiper

audioguru

I am only like 50 years older than you, little kid.

Ask your mommy or daddy to buy parts online for you from Digikey or Newark. If you order before 8:00PM then it is delivered the next morning unless you live on Mars.

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ericgibbs

A variable resistor [potentiometer] has 3 connections.

For your project the two outer connections are connected as follows.
One to the +5V line and the other to the 0V line, the centre connection [the wiper or slider] goes to the LM3914 Vsource input.

So as you turn the pot the voltage on the wiper will vary.

Look here:
http://en.wikipedia.org/wiki/Variable_resistor

Do you follow .?

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

davidbball13

hey cmon dont bring my mom and dad into this i feel like i am doing good now i install linux on computers for friends i work at a computer store making 8.95 a hour. i have made a 275mw red laser with a regulated power supply (LM317) and a 50mw blu laser also with the LM 317. i have built a quad core computer.

really shipping is that quick how much is it.

ericgibbs

hi David,
Dont let anyone bug you about your age.!

This is a technical forum, we will help if we can, just give us as much detail as you can so that we can advise you correctly.

Nice one with the laser projects.!

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

audioguru

Hey little kid,
If you worry about a few dollars to ship parts to you then you can't afford anything.

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Uncle $crooge