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 Forum index » DIY Hardware and Software
2 or more 555 oscillators
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chutneyfarmer



Joined: Jul 21, 2006
Posts: 16
Location: Ireland

PostPosted: Fri Jul 28, 2006 10:41 am    Post subject: 2 or more 555 oscillators Reply with quote  Mark this post and the followings unread

heya folks.

i've been trying to find schematics online that will show me how to wire 2 or more 555 based oscillators together. so far i haven't had any luck. i'm hoping to build a device similare to these....

http://benthack.blogspot.com/2005/05/noizer-ii-square-wave-synth.html

http://community.livejournal.com/circuitbending/208258.html

the circuit of the second one looks really simple!!!

if anyone has finished schematics of similar devices, it would be great. buying components over here (ireland) is pretty expensive so i can't really afford to go out and buy a load of different value components to experiment with.

i really just want to build a simple noise synth for myself to annoy the neighbours with Smile any help would be very much appreciated

thanks
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Gimpoid



Joined: Jul 19, 2006
Posts: 5
Location: Ireland

PostPosted: Thu Aug 03, 2006 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

hey dude nice to meet you where abouts in ireland are you north or sounth, i am in the north myself just ouside belfast.
you could wire the output of osc 2 (pin 3)to modulate the freq/pitch (cant remember the pin)of osc 1 .
they should all be able to power off the 1x Embarassed 9v battery
apart from that i am not really sure what you mean.
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dnny



Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8

PostPosted: Fri Aug 04, 2006 2:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Gimpoid wrote:
they should all be able to power off the 1x Embarassed 9v battery
apart from that i am not really sure what you mean.


take a look on this topic not ANOTHER 555 synth...Help?

terminal.h0micide wrote:
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

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

jksuperstar wrote:
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


so the advise is to use 7555 instead of 555

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