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 Forum index » DIY Hardware and Software
not ANOTHER 555 synth...Help?
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Italye



Joined: Jul 26, 2006
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PostPosted: Wed Jul 26, 2006 2:52 pm    Post subject: not ANOTHER 555 synth...Help? Reply with quote  Mark this post and the followings unread

hwey guys, i'm trying to build a cool little hardware synth out of the 556 dual timer. have you seen anybody do something like this with a 555 equivalent? and so i drew out these schematics, modified from some site and i'm wondering if any of you know if this might work...or if i did something wrong, or could make it easier for myself. basically, you have a switch to choose the octave, with diff. resistors, and then when you hit a key, it adds resistance to the octave "base" resistance, so i'm pretty sure i actually dont need R1, since the octave and key area actually R1. but will that screw with something? i think the difference between R1 and R2 determines the pulse width or w/e, and it'd be nice to have a switch to control that. and i havent done all the math, so yeah...thyanks
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it'll be like monomate, but hardware

edit: eep! wrong forum! i just saw that there is actually a DIY synth section...ummm feel free to move this there. Embarassed
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seraph
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PostPosted: Wed Jul 26, 2006 3:51 pm    Post subject: Re: not ANOTHER 555 synth...Help? Reply with quote  Mark this post and the followings unread

Italye wrote:

edit: eep! wrong forum! i just saw that there is actually a DIY synth section...ummm feel free to move this there. Embarassed

done Exclamation welcome to electro-music.com Very Happy

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dnny



Joined: Mar 12, 2005
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PostPosted: Fri Jul 28, 2006 12:46 am    Post subject: Reply with quote  Mark this post and the followings unread

welcome

i think the best way to develop things is by breadboarding them. so you can try if the R1 is necessary and you can tweak other component values . when you are pleased whit what you have, just solder everything up on a stripboard or veroboard

PS. have you tried Ray Wilson's Schematic Publisher Smile

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Italye



Joined: Jul 26, 2006
Posts: 2
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PostPosted: Fri Jul 28, 2006 1:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeah, i havent really ordered all the components yet so i was just fleshing out some ideas, so i'll probably buy a breadboard now, seeing as how they work, instead of alligator clipping everything together..and yeah, sorry about the ridiculously sloppy diagram.

thanks! Smile
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terminal.h0micide



Joined: Aug 01, 2006
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PostPosted: Tue Aug 01, 2006 1:52 pm    Post subject: 555 synth Reply with quote  Mark this post and the followings unread

the only prob i know with 555s is that each timer needs a seperate power source or isolate them somehow, otherwise they all run the same freq

im looking to build a drum synth out of 555s if i get a diagram ill share it with you
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toppobrillo



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PostPosted: Tue Aug 01, 2006 8:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh hey you shgould use the 7555 dude it uses alotless current and is more tame than t'other
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jksuperstar



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PostPosted: Tue Aug 01, 2006 10:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, the 7555 uses a CMOS process, not the old, which I believe was bipolar. As such, the newer CMOS style won't jacknife (nearly short) the power supply the way the 555 can when it switches.

That said, the normal old 555 might have a little unpredictable character to it ...partly due to it's bipolar nature? Very Happy Very Happy Shocked
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