cmos based Dubsiren

DUBmatze

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.

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

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

PHOBoS · Posted: Mon Nov 04, 2013 12:09 pm Post subject:

nice one

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

DUBmatze · Posted: Mon Nov 04, 2013 1:08 pm Post subject:

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 ...

commathe · Posted: Mon Nov 04, 2013 7:15 pm Post subject:

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

DUBmatze · Posted: Tue Nov 05, 2013 7:56 am Post subject:

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.

commathe · Posted: Tue Nov 05, 2013 6:26 pm Post subject:

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

DUBmatze · Posted: Sat Nov 09, 2013 6:46 am Post subject:

Till at the conntrols:

schmelfhelp · Joined: Apr 15, 2012 Posts: 24 Location: france

I've been trying to make this circuit but not much luck. so far I'm just getting a tone with 2 of the knobs not really doing much. I was wondering what diodes you are using?

cheers

DUBmatze · Posted: Tue Sep 02, 2014 5:15 am Post subject:

mhm ... my webserver is down.... (maybe you can upload the shematic to this forum)
i have used 1n4148 for this.

If you only get a permanent tone the LFO isnt working.
Try this LFO section:

basicdubsiren.png

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schmelfhelp · Joined: Apr 15, 2012 Posts: 24 Location: france

Thanks! I'll give that a try.
I found a cached version of the schematic.

schmelfhelp · Joined: Apr 15, 2012 Posts: 24 Location: france

so that worked better but i could only get sound to work for the square wave when I don't have a resistor running to +

How does the logic work when input 1+2 are tied together?

Cheers

PHOBoS · Posted: Wed Sep 03, 2014 4:14 pm Post subject:

schmelfhelp · Joined: Apr 15, 2012 Posts: 24 Location: france

thanks! i'll give that a go with the diode. It's sounding pretty nice, one siren type sound and then a modulated sound which is true to your diagram.

I also just tried adding in the parts like the first circuit diagram. I'm not having much luck with it. are the second and third inverters just to operate the LED?

Also what is the purpose of the 1000u cap? again, it's not doing anything much for me at the moment. might give the first circuit a fresh go in the morning.

Cheers

DUBmatze · Posted: Thu Sep 04, 2014 5:16 am Post subject:

DUBmatze · Posted: Thu Sep 04, 2014 5:19 am Post subject:

ups maybe 10k is a bit low try 100, 200k or so .....

DUBmatze · Posted: Thu Sep 04, 2014 5:28 am Post subject:

mhm iam to slow.....

kip · Joined: Jan 23, 2017 Posts: 6 Location: UK

I finally got some cd4093BE chips. (long wait, dont ask.)

I tried breadboarding just the oscillator at +9v.
For some reason it isnt working.

pin
14=+7v
7=0v
1=3v4
2=3v4
3=3v4

This is my first time with this chip.

I was wondering if the project is verfied or any ammendments have been made to the circuit.

I was expecting a nice freqauncy range from low to high. but when I turn the pot it seems the gain is altered not the freqauncy.

please help.
Thanks
Rich

kip · Joined: Jan 23, 2017 Posts: 6 Location: UK

strato54s · Joined: Mar 03, 2014 Posts: 3 Location: france

Hi there
This synth siren is so cool I really want to make one
Please someone has the schematic of this post and the part list please.