oscillators and looping a sound

Tokyo Witch · October 31, 2007, 03:37:12 PM

Hi,

I've only just started my first project last night and it seems to be going quite well. The project I'm working on is a toy electric guitar with buttons that produce sounds. I'm managed to change the sound with two pots one to speed it up and one slows it down. It sounds great.

I have a question about an aditional bend I'm trying out. at the moment when I push the button it plays the sound once and then I can alter it. What I want it to do is loop the sound. I don't mind if the actual loop isn't from the begining of the sample I just think it would sound better if I could get a sustained sound and then speed it up and slow it down.

What I did do was replace the push button with a switch however I think I will need some form of oscillating ciruit connected to the switch so it would turn it on and off continuously. Does anyone know how I can do that?

There is nothing in reed ghazala's book on oscillators and whether they would fry a circuit. I suppose I could just buy one and see what happens but I don't want to buy one and have nothing happen

Thanks,

the_zombiest · November 01, 2007, 12:12:26 AM

You can use a simple astable 555 circuit such as this one to trigger switches: http://www.mikmo.dk/cblfo.html
mad easy.

untune · December 06, 2007, 12:59:35 AM

Can this LFO circuit be used on a keyboard to vary the sound a little?

wiredtoygeek · January 14, 2008, 07:12:29 PM

hmmmmm...The stuff I'm bening doesn't seem to have a 555 on the board. Can I add one to the circuit board?

computer at sea · January 20, 2008, 04:53:04 PM

Quotehmmmmm...The stuff I'm bening doesn't seem to have a 555 on the board. Can I add one to the circuit board?

Yeah. Follow the link given above to build your own oscillator with a 555 chip and a small handful of other parts.

goldenbaby · December 18, 2008, 04:56:28 AM

Does a 555 circuit like this also work to sample a sound....well, not really sample, but so that while a circuit is glitching out, I can lock it into a trance with the flick of a switch or turn of a pot?

computer at sea · December 18, 2008, 05:43:41 PM

Hmmm.... kind of. It can loop some glitches, particularly ones that connect to the ground of the circuit.