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 Forum index » DIY Hardware and Software
Clock , clocks & clocking
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Skrog Productions



Joined: Jan 07, 2009
Posts: 788
Location: Scottish Borders
Audio files: 87

PostPosted: Sat Dec 14, 2013 6:29 am    Post subject: Clock , clocks & clocking
Subject description: tick tock
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Hi all
I have a list of a few tweeks and upgrades for some of the modules in my blue synth .
While browsing the euro modular worlds infinite web pages i stumbled upon this http://www.4mspedals.com/qcd.php
and i thought , i wonder if there is an easy diy way of building just one of the clock channels , perhaps even without vc control .

I have 5 DIY sequencers (Fonik vcps8 / RYK M-185 / EM Klee / mfos 16 step standard / mfos 16 multi step ) i have built clock dividers for these (ample circuits on web) but it's the clock multiplication on the 4ms unit that interests me , i don't have any form of pic chip burning experience , just pushing a pic chip into a dil socket for projects is as far as ive went.

Scott from L.A. very kindly gave me a link many moons ago for a circuit to simply double an incoming clock , could i expand the circuit to get x2 / x4 / x8 clock speeds ?

I have posted something like this before but my brain needs re-freshed every so often Very Happy heheh

Dave.

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JovianPyx



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PostPosted: Sat Dec 14, 2013 1:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

I assume that you refer to a PLL using a 4046?

If so, the answer is "yes", you can multiply by any integer.

To multiply by 2, you would use a divide by 2 (simple toggle flipflop) counter inside the loop. If you want 4x, then use a divide by 4 counter. For 8x, you would use a divide by 8 counter. In fact, you can also use odd dividers such as divide by 3 to get 3x.

Also, you could use a counter like divide by 16 and a 1 of 16 decoder. This would give you selectable outputs of /1 /2 /3 /4 /5 ... /16. Take the output of the decoder and use that to reset the counter.

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Skrog Productions



Joined: Jan 07, 2009
Posts: 788
Location: Scottish Borders
Audio files: 87

PostPosted: Sun Dec 15, 2013 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Scott , i'll sketch a diagram later today to plan out what i need on the new clock module im building.

Dave.

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