Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Electronics
 Basic Electronics
 LED circuit help

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:
UserName:
Password:
Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List
   
Message:

* HTML is OFF
* Forum Code is ON
Smilies
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG)

   

T O P I C    R E V I E W
jackd Posted - Oct 14 2009 : 5:07:05 PM
First off I'll let you know my electronic knowledge is limited. (I have first year industrial electrician schooling) What i need is hard to explain but basically I have a xylphone type instrument and i want an LED to stay on for 2 seconds or so when a key is rung. i want an LED for each individual key. having a corded hammer (the thing you hit the keys with) is definiatly an option to carry voltage or whatever, and i need all this in as small as a space as possible. is this possible to be done easily and cheaply or even at all? please help.
2   L A T E S T    R E P L I E S    (Newest First)
Aaron Cake Posted - Oct 18 2009 : 10:33:12 AM
R/C network. Just Google "resistor capacitor timer" and you will get the idea.
monobrow Posted - Oct 15 2009 : 09:15:25 AM
it's definately possible, but i'm wondering the best way to do it.

I should think the best way is to have diodes on each key and a capacitor that charges on key press. Use maybe a darlington pair couple with the capacitor to act as a timing circuit.

personally i would use a 555 timer, but i can't think how you could isolocate each key with one single timer.

Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.05 seconds. Snitz Forums 2000