Author Topic: Cd4046 intelligent ring modulator  (Read 237 times)

0 Members and 1 Guest are viewing this topic.

Oweng4000

Cd4046 intelligent ring modulator
« on: February 14, 2018, 11:05:23 AM »
Iím currently building a ring modulator pedal using a ad633 and I had a crazy idea and I was wondering if it was at all feasible. I would feed a cd4046 my guitar signal and use the PLL to track the signal and then use a switch to get it to hold the note I just played so I could have the ring modulator match the key I was playing in. Anyone have any experience doing something like this?

EBK

Re: Cd4046 intelligent ring modulator
« Reply #1 on: February 14, 2018, 11:24:16 AM »
You just reminded me that I need to learn more about PLLs.   :icon_wink:

Welcome to the forum!

I'm still messing with an AD633-based modulator on my breadboard.  Interesting chip.

I like your idea of locking in a frequency using a guitar note. Probable could have lots of uses.
No affiliations. If I glowingly mention specific merchants or products, it is because I like them without having to be paid to like them.

iainpunk

Re: Cd4046 intelligent ring modulator
« Reply #2 on: February 14, 2018, 12:12:59 PM »
Seems like a great idea!!!

Maybe you could also use the PLL to track your signal octave down or up (switch) for even more options in sound.

All the best of luck
Iain
If we don't study the mistakes of the future, we're bound to repeat them for the first time.
-Ken M

Kipper4

Re: Cd4046 intelligent ring modulator
« Reply #3 on: February 14, 2018, 12:19:56 PM »
Since the CD4046 is voltage controlled I reckon you'd have a hard time matching the vco tone to a guitar note.
I feel sure it's been tried before.
Maybe do a forum search for 4046 ?

I hope you can do it though.
Jellybean dodging since 2012.
Smoke me a Kipper. I'll be back for breakfast.

PRR

Re: Cd4046 intelligent ring modulator
« Reply #4 on: February 14, 2018, 03:57:23 PM »
This was discussed within the last month.

"Tracking" is not as easy as we could wish. But there is/was a commercial product that let a '4046 acquire a tone, and then broke the VCO loop so it held (as long as the cap leakage allowed).

EBK

Re: Cd4046 intelligent ring modulator
« Reply #5 on: February 14, 2018, 04:38:51 PM »
Sounds like tracking time isn't an issue, if I understand the goal correctly. 
No affiliations. If I glowingly mention specific merchants or products, it is because I like them without having to be paid to like them.

reddesert

Re: Cd4046 intelligent ring modulator
« Reply #6 on: February 14, 2018, 06:39:40 PM »
The CD4046 PLL is used in the Parasit Studios Guitar Synth octave circuit. Together with a shift register, it is used to generate  a 1 or 2 octave up square wave. You might look at that for ideas. There is sort of a similar concept in the frequency synthesizer section 4.2 of the CD4046 application note, see http://www.ti.com/lit/an/scha002a/scha002a.pdf

matmosphere

Re: Cd4046 intelligent ring modulator
« Reply #7 on: February 14, 2018, 10:52:48 PM »
Neat idea, Iím interested to see how it plays out.

I just built the Parasit U235. It also uses a 4046 to make one or two octaves down but it has a completely different feel than the into the unknown so it might be worth looking at too.