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 Forum index » DIY Hardware and Software
simplest sub osc
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
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PostPosted: Mon Aug 21, 2006 7:20 am    Post subject: simplest sub osc Reply with quote  Mark this post and the followings unread

Hi guys, nothing fancy for me today. i know how this works, i just forgot what cmos ic is best used.
All i need is div by 2 and 4 with 50/50 duty cycle. 40xx?

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Scott Stites
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Joined: Dec 23, 2005
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Location: Mount Hope, KS USA
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PostPosted: Mon Aug 21, 2006 9:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Zipzap,

I use the CD4013.

Cheerio,
Scott
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
Audio files: 24

PostPosted: Wed Aug 23, 2006 10:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Scott, i too use a 4013 now. I´ve got a little extra for your suboscs. I wanted to fade between 1 and 2 oct down with a single pot. Get some nice colours. Best of all, in the middle position you get a stairwave that is another octave lower (makes 3). Looking at the second wave on my drawing you see what i mean. It sounds different than a square, it´s first overtone is also very prominent.
The opamp stuff is to get even amplitude and to compensate the offset from the single power cmos.
BTW, this makes me think:
Is it posssible to power a single cmos chip from coltage dividers? like, i have a +-12v supply. I use resistors to make +-6v for the chip, so i get a bipolar output and don´t need the last opamp/trimmer.
Of course the square clocking it would need to be limitet between that range.


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