Sunday, August 10, 2008

555 Oscillator


I soldered together an oscillator from a 555 chip this afternoon and it pretty much works. It's got a Control Voltage input, an output and a big old 1meg pot for pitch control. The switch turns it on and off.

It "pretty much works" in that it definitely puts out a loud square wave, but the pitch only goes up and down so much before cutting out, despite there being throw left on the dial (about 1/5 of a turn in either direction). I'll tinker with it and see if swapping out the resistor in the circuit (100k) for one of a different value does anything. Look for a video when I've got it in a more, um, respectable state.

In the meantime, can anyone out there point me in the direction of a 555 cookbook for basic (read: BEGINNER) circuits? I'd like to get better at this using something other than trial and error as a guide. Thanks!

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2 Comments:

Anonymous Anonymous said...

this place might be useful to you:
http://home.cogeco.ca/~rpaisley4/LM555.html

also, these Forest Mims books are really great introtuctory texts :
http://www.forrestmims.com/engineers_mini_notebook.html

Spacehoof

8:33 PM  
Blogger Pete Shambler said...

Thanks Spacehoof! Exactly what I was looking for.

4:31 PM  

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