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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
cmos based Dubsiren
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DUBmatze



Joined: Feb 18, 2013
Posts: 72
Location: DE

PostPosted: Mon Nov 04, 2013 10:20 am    Post subject: cmos based Dubsiren
Subject description: Siren alongside cmos
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the classic Dubsiren is a design with 2* LM555.
Today i finished my "lunettastyle" Siren with cmos. (4093, 4046)

Posted Image, might have been reduced in size. Click Image to view fullscreen.

here is a quick video (sorry not the best sound quality)
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PHOBoS



Joined: Jan 14, 2010
Posts: 1520
Location: Moon Base
Audio files: 319

PostPosted: Mon Nov 04, 2013 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice one Very Happy

I did spot one small mistake in the schematic, the power pins for the CD4093 should be 7 and 14. Since you have one spare NAND it could be used to
make another oscillator. If you connect it to pin 5 of the 4046 you can modulate the VCO (on/off), or if you connect it to pin 14, short pins 3 and 4
and take the ouput from pin 2 you will get a ringmod signal of the VCO and the oscillator. not sure if that's a sound usefull for a dub siren though,
and you allready have it build in a nice box anyway. Cool

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DUBmatze



Joined: Feb 18, 2013
Posts: 72
Location: DE

PostPosted: Mon Nov 04, 2013 1:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Phobos,

i uploaded a corected version.

Switching the osc on and off i tryed two devices earlier - i wasnt happy with it:
Smile


the ringmodthing is somthing for my modular Lunetta i think ...
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commathe



Joined: Jul 26, 2013
Posts: 42
Location: Beijing

PostPosted: Mon Nov 04, 2013 7:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

the LFO speed/LFO style section looks really interesting. How does it work?
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DUBmatze



Joined: Feb 18, 2013
Posts: 72
Location: DE

PostPosted: Tue Nov 05, 2013 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello commathe,

my plan was feeding the 4046 with a triangle voltage to get the classic "ni-no-ni-no" sound (like my 2 years old son say).

So i grab the voltage on the input of the 4093 oscillator. While i am breadboarding this i notice when i connect somthing to the output or input of the oscillator it destroy the geometry of the triangle. so i keep trying with different duty cycle circuits. (i.e. http://electro-music.com/forum/topic-47266.html)

After some trys i added a pulldown resistor (91k) to the input. Now the pots called "LFO Speed" and "LFO Style" change the frequency of the LFO. "LFO speed" gives the bigest amount of frequency change, but i need to adjust the duty cycle with "LFO Style" to stay at the "ni-no-ni-no"-sound. othewise i get a slower "iou-iou-iou-iou"- or a faster "di-di-di-di"-sound.

I think the "ni-no" is a /\/\ at the input of the 4046. the "iou-iou" is more like /|/| (raising ramp) and the "di-di" is more like |\|\ (falling ramp). that all happens because the load at the input of the 4093 prevent the cap from loading "normal".

Maybe a stereo pot with two diffrerent resistors and diodes will help here to stay always at a triangle. -> but i like the 2 pots at the siren Wink

maybe some1 else can explain it better.
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commathe



Joined: Jul 26, 2013
Posts: 42
Location: Beijing

PostPosted: Tue Nov 05, 2013 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome! Thanks for the explanation! I hope to breadboard me up one of these soon!
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DUBmatze



Joined: Feb 18, 2013
Posts: 72
Location: DE

PostPosted: Sat Nov 09, 2013 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Till at the conntrols:

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