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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Ring Modulator for the Sound Lab
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shimshon



Joined: Sep 03, 2008
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PostPosted: Thu Jan 22, 2009 10:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks
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mosc
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PostPosted: Fri Jan 23, 2009 2:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

shimshon wrote:
stolenfat wrote:
jameco sells them for 9 bucks a pop, is there a cheaper place to find them? 9 bux! I think thats whacky!


they're on "sale" for 7.75 now Confused


Considering there is no need for trimpots and it is much more stable, this is a pretty reasonable price, IMHO.

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LektroiD



Joined: Aug 23, 2008
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PostPosted: Fri Mar 27, 2009 7:48 pm    Post subject: Re: super simple ring modulator Reply with quote  Mark this post and the followings unread

dnny wrote:
Hi all there is one RM circuit from Aaron Cram

its analog and uses LM13700 (transconductance Amp) + 3 op amps , 8 resistors and 2 pots - thats all! so it´s really super simple

i havent try it yet but, you cant lose anything by breadboarding this

http://www.ori.org/~aaronc/synth/
and scroll down for ring modulator


daniel

did anyone save this schematic before the link was removed?

*Edit* I found it:
http://experimentalistsanonymous.com/diy/Schematics/Ring%20Modulators%20and%20Frequency%20Shifters/LM13700%20ring%20mod.pdf

Anyone know the pin numbers for the 13700? They're missing on this schematic. Also the 33KΩ resistor is going nowhere?

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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Mon Mar 30, 2009 5:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

hello

it looks like that 33K is going to +voltage

here is the pinout of the National Semiconductor LM13700 from the datasheet. i believe this is the usual pinout for this chip.

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

hope that helps Smile
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Mon Jun 15, 2009 12:13 am    Post subject: Re: super simple ring modulator Reply with quote  Mark this post and the followings unread

LektroiD wrote:
dnny wrote:
Hi all there is one RM circuit from Aaron Cram

its analog and uses LM13700 (transconductance Amp) + 3 op amps , 8 resistors and 2 pots - thats all! so it´s really super simple

i havent try it yet but, you cant lose anything by breadboarding this

http://www.ori.org/~aaronc/synth/
and scroll down for ring modulator


daniel

did anyone save this schematic before the link was removed?

*Edit* I found it:
http://experimentalistsanonymous.com/diy/Schematics/Ring%20Modulators%20and%20Frequency%20Shifters/LM13700%20ring%20mod.pdf

Anyone know the pin numbers for the 13700? They're missing on this schematic. Also the 33KΩ resistor is going nowhere?


The link is gone again... Sad
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optigrab929



Joined: Nov 19, 2009
Posts: 4
Location: New York, NY

PostPosted: Thu Nov 19, 2009 6:02 pm    Post subject:  AD633 Ring Mod
Subject description: HELP!
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Hey,

I am trying to build this circuit>


http://www.musicfromouterspace.com/analogsynth/RingModulator/RingModulator.html

I'm new at this stuff, and it's for a project for school...I was told that I could use two 9V batteries linked together with battery snaps to create the +9V and -9V. Is this ok?
Also, how does this all translate to the breadboard (is -9V going to the ground rail, or are the things going to ground separate)?
I bet you can tell that I'm a novice.
Please help!

Thanks,

Brandon
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v-un-v
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PostPosted: Fri Nov 20, 2009 4:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey Brandon, welcome to electro-music.com Very Happy

Yes- two 9v batts will be fine. You need to read off the spec sheet how much of less the chip will take, voltage and current wise. But yes, you should be fine. Smile

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optigrab929



Joined: Nov 19, 2009
Posts: 4
Location: New York, NY

PostPosted: Fri Nov 20, 2009 6:54 am    Post subject: Ring Mod Reply with quote  Mark this post and the followings unread

Thanks!
But I am confused -- should the things in my schematic going to "ground" be going to the same rail as the things going to -12V? (i.e. things going to +12V to the red rail and ground and -12V going to the blue rail)

I am very new to all of these procedures--if you have a tutorial or a detailed description of how to do this properly, it would be extremely helpful!

Thanks again,

Brandon
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Blue Hell
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PostPosted: Fri Nov 20, 2009 9:57 am    Post subject: Reply with quote  Mark this post and the followings unread

You'll need the + of one battery to go to the - of another, that junction will be your ground (and you could make the connection between the batteries on the ground terminal of your circuit).

Then you'll have another two battery terminals, one labeled - which will go to the -12V connection on your circuit and another labeled + going to the +12V on the circuit.

like this :

Code:



        +---------------> to +12V on circuit
        |
        |   +
      -----
       ---
      -----  9 Volt battery 1
       ---
      -----
       ---
        |   -   
        |
        +---------------> to Ground on circuit
        |
        |   +
      -----
       ---
      -----  9 Volt battery 2
       ---
      -----
       ---
        |   -   
        |
        +---------------> to -12V on circuit


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optigrab929



Joined: Nov 19, 2009
Posts: 4
Location: New York, NY

PostPosted: Fri Nov 20, 2009 1:47 pm    Post subject: Power Supply Reply with quote  Mark this post and the followings unread

Thanks!

I have two 9V battery snaps (each with a red and a black wire). So I snapped the positive of one battery to the negative of another. So both the red and black wire from this side go to the ground rail on my breadboard? If yes, then do I put the battery snap on the other side also and connect the red (pos.) and black (neg.) to their respective places within the circuit?
AND..since the positive and negative voltages need to be applied to both the Analog Multiplier and the Op Amp, how do I bus the power (especially the negative voltage).
Am I missing something? Is the negative voltage also part of the red (power) rail?
Sorry I'm so slow, but you guys are really helpful!!

Thanks a lot,
Brandon
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optigrab929



Joined: Nov 19, 2009
Posts: 4
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PostPosted: Fri Nov 20, 2009 1:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Also, my switch configuration is a little loopy. I realize that it is a 6-lead DPDT switch, and I know how it functions, but I am having trouble translating what pin goes where within my circuit. I have a drawing that I found (attached) of a DPDT setup and I was wondering if it is correct, and if so, which pin is which compared to my schematic (A=1, B=2, etc.)??

http://www.musicfromouterspace.com/analogsynth/RingModulator/RingModulator.html

Thanks so much again!!

Brandon


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MirlitronOne



Joined: Nov 07, 2009
Posts: 77
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PostPosted: Thu Nov 26, 2009 4:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

1. Look carefully at Blue Hell's diagram above. It explains all your connection questions.

2. Do not use your polarity-reversal switch circuit, as this is not what you want to do (unless you want to let the smoke out). Treat your DPDT switch as a DPST double on-off switch. Use one half to switch the +V supply line, and the other half to simultaneously switch the -V supply. The joint ground connection can stay connected all the time.

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skylab76



Joined: Dec 30, 2007
Posts: 38
Location: Austin

PostPosted: Sat Dec 19, 2009 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

If anyone is interested in building a stripboard version of the AD633 based ring modulator, here's my diagram:

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

The layout is based on the Ray's schematic , of course:

http://www.musicfromouterspace.com/analogsynth/RingModulator/RingModulator.html

I added extra amplification on the mod and carrier inputs, and I've constructed one based on my diagram. It works like a charm.

Here's the PDF (easier on the eyes).
http://www.fileden.com/files/2009/2/22/2334311/AD633_RM_SBLayout.pdf

Note: each grid horizontal grid line represents a trace and the intersections represents holes. It may not look perfect since I used Graffle to create the layout.

I'll append some samples this weekend.
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MirlitronOne



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PostPosted: Sun Dec 20, 2009 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for that contribution!

A suggestion: cutting all the traces across the board will significantly weaken the board. Just cut the traces where you need to - i.e. between the pins on the ICs - and then you won't need those extra link wires, either.

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skylab76



Joined: Dec 30, 2007
Posts: 38
Location: Austin

PostPosted: Sun Dec 20, 2009 4:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

MirlitronOne wrote:
Thanks for that contribution!

A suggestion: cutting all the traces across the board will significantly weaken the board. Just cut the traces where you need to - i.e. between the pins on the ICs - and then you won't need those extra link wires, either.


Thanks for the tip. Yes, in the end, the board seemed a bit "flimsier." That was my first one. I'm working on a layout for René Schmitz's "VCA-2" and I'll definitely follow that advice. That one is tricky since there are numerous cuts for the transistors ,etc.

Regards,
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MirlitronOne



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PostPosted: Sun Dec 20, 2009 5:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

It comes with practice, but it's worth the effort. Once you've had a bit of experience, it's way easier than making PCBs. Rock on!
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Antimon



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PostPosted: Mon Dec 21, 2009 4:44 am    Post subject: Reply with quote  Mark this post and the followings unread

skylab76 wrote:
If anyone is interested in building a stripboard version of the AD633 based ring modulator, here's my diagram: (...)


Wow, cool! Thanks for this! Smile I've been waiting to try out a stripboard design, and this looks like a great, simple project.

/Stefan

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skylab76



Joined: Dec 30, 2007
Posts: 38
Location: Austin

PostPosted: Mon Dec 21, 2009 9:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Stefan. I'm glad to share.

MirlitronOne, yes, I'm really enjoying the strip board method. I've rebuilt a few of my modules I constructed on peg board which were horrendous ( I found another module still on breadboard Laughing ). That was worth the time and now I'm looking forward on finishing a couple of new stripboard-based modules. If they're up to par, I'll post them somewhere central in the forum.
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sync24



Joined: Aug 08, 2009
Posts: 18
Location: UK

PostPosted: Fri Dec 17, 2010 7:39 am    Post subject: Reply with quote  Mark this post and the followings unread

skylab76 wrote:
If anyone is interested in building a stripboard version of the AD633 based ring modulator, here's my...


i know this i from a year ago, but thanks!
it's just what i was looking for Smile

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