help with light organ using bjt

Thread Starter

ibm123

Joined May 13, 2009
17
hello again
i'm tring to make some led organ..

i got 4 leds i want each one will light on 4 diffrent frequency..

i got the circuit but it works only if i use 4 darlington pairs

problem is i dont have time to wire up so many

please look at my schemetic and see if you can help me

thank you
 

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Wendy

Joined Mar 24, 2008
21,839
OK, lets get that picture out of the word document...



Ever use a protoboard? It is a quick way to wire something like this.
 

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Thread Starter

ibm123

Joined May 13, 2009
17
but my professor insist that we will wire it...
thats why i want it to be a small parts project..

what are my options ?
 

Wendy

Joined Mar 24, 2008
21,839
Wire one or two, to show the basic principle. Truth, it doesn't take that long, but you have to start somewhere.

Remember, this circuit is repetitious. Besides, I've known lots of people who make projects using protoboards as the final way to do it. Expensive, but practical. It don't see how protoboards could be ruled not wireing it, it is just another form of breadboarding, same as solder.

Suggestion, put an LED on the collector.
 

Thread Starter

ibm123

Joined May 13, 2009
17
do you think there is a way to make it work with an volt amp ?
like op amp or CE\CB ?
 

Wendy

Joined Mar 24, 2008
21,839
A volt amp ?

You're going to have to define that one.

I would have done it a little different, like using a wien bridge. But there are lots of ways to do this.

I'm also a firm believer in KISS (Keep It Simple Stupid).
 
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