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Post by keurslagerkurt on Oct 3, 2021 19:58:08 GMT
As of this weekend, I'm selling a new module kit called 'The Great Divide' that is based on the basic R2R resistor ladder circuit. ( www.tindie.com/products/keurslagerkurt/the-great-divide-2-x-r2r-module-diy-kit/ ) I wanted to make this post here, to encourage anyone with the brAEdboard or a normal breadboard to try it out for yourself. Its an incredibly easy and fun circuit to make, as it uses only resistors. The circuit itself, as well as different patch uses, are explained perfectly over here: www.olegtron.com/olegtron-r2r-1For the final module, I changed the resistors to smaller values (as we deal with lower voltages in AE), and they can probably be even smaller if its just for a breadboard build. Just make sure you use resistors of equal values where there are equal values in the original. You could probably get away with as low as 1k resistors, but the power consumption will of course go up. My final schematic is for the module is this: Schematic_The Great Divide_2021-10-01.pdf (41.45 KB) |
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Post by maydonpoliris on Oct 3, 2021 21:54:35 GMT
very unselfish of you. Thanks for sharing.
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Post by rodney on Oct 4, 2021 6:28:30 GMT
Thou art legende! 
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Post by pt3r on Oct 4, 2021 6:55:41 GMT
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Post by keurslagerkurt on Oct 4, 2021 9:26:09 GMT
Oh wow, didn't know this existed, but makes a lot of sense that it exists for the DAC setting! Shows that I'm still relatively new to this electrical engineering bizniz  This would make it easily possible to fit even 4 of these in 1U AE! But that might as well be overkill? Interesting find, thanks for sharing. |
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Post by funbun on Oct 4, 2021 22:31:07 GMT
Wow! Already sold out!
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Post by bearheadwood on Aug 12, 2023 4:59:04 GMT
Glad this was still here when I finally got around to it a couple of years later, thanks!
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Post by leethargo on Dec 22, 2023 17:03:26 GMT
Newbie question here: I thought that the "resistor ladder" is called R/2R, because it features two types of resistors, one having double the resistance of the other.
But in the schematics, I see the values 4.7kOhm and 10kOhm, so it's not exactly double. Is this intentional, to compensate for some other effect, or are 4.7KOhm resistors just abundant and close enough?
I'm asking because I wanted to try this on a breadboard but only using one type of resistor (for 2R) and then plug in two of these in parallel to get R.
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Post by solipsistnation on Dec 22, 2023 17:49:24 GMT
...and so they're REALLY common and extremely inexpensive, while 0.5 may be more expensive and/or harder to get and still probably not entirely accurate anyway (or you will only be able to get 0.5 resistors in very high precision, and thus very expensive packages).
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gerif
Junior Member
Posts: 76
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Post by gerif on Dec 22, 2023 22:44:30 GMT
There are R2R network integrated in one componete to buy:
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Post by saltatempo on Dec 23, 2023 8:31:05 GMT
Hi I'm new here. Thanks for these Infos. This is my prototype 2U breadboard module.
I'm new in eletronics too so please be patients ![]() Attachments:
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Post by saltatempo on Dec 23, 2023 8:51:11 GMT
I don't undestand the P3 part in the diagram, is it present? In front of the module I see only the 8 inputs and 8 outs
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gerif
Junior Member
Posts: 76
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Post by gerif on Dec 23, 2023 9:59:45 GMT
P3 is the connecter at the back of each module for connectong the bus which is running from Master or Power module to all other modules! The Great Divider is using only the GND!
On your bread board you get the GND e. g. from Master Modul! |
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Post by saltatempo on Dec 23, 2023 11:49:37 GMT
Thank you!
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Post by saltatempo on Dec 23, 2023 12:22:17 GMT
Here It Is, only 4 in and 4 outs. Chances to testing It right now with my Volca? 3,3V DC into PIN 1 IN and jumpers from the 4 outputs going to the volca modular stuff, Is It safe? Attachments:
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Post by saltatempo on Dec 23, 2023 12:37:06 GMT
Mmm... what is the difference between the left IN column and the right OUT column? I'm thinking there is no difference... IN or OUT we can choose to use the left one or the right one as we want. Is it wrong?
Like a Dual Attenuator
left column pin 1 1,22 V (37%)
pin 2 1,74 V (53%)
pin 3 are OUT 2,26 V (68%)
pin 4 is IN 3,3 V
GND in common
right one pin 1 0,66 V (20%)
pin 2 1,33 V (40%)
pin 3 are OUT 1,99 V (60%)
pin 4 is IN 3,3 V
GND in common
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Post by saltatempo on Dec 23, 2023 12:50:31 GMT
P3 is the connecter at the back of each module for connectong the bus which is running from Master or Power module to all other modules! The Great Divider is not using any of the signals from bus!
You need only the resistances!
How can this module be connected to the ground of the MASTER? Update: my 5ATT module 2U using also forum.aemodular.com/thread/359/diy-project-01-passive-attenuatorsAttachments:
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Post by leethargo on Dec 23, 2023 15:14:44 GMT
Nice pictures! I tried breadboarding it as well, but it turns out I have the wrong resistors (4.7Ohm instead of 4.7kOhm).
> How can this module be connected to the ground of the MASTER?
I think you're supposed to connect to the ground where it says GND in the schematics, at the very top, next to R29 and R8. So, this specific part of P3 is used, after all.
I'm not sure what the difference is between connecting to GND in the bus cable or on the front panel of some module (eg MASTER), but I believe the front panel connections have some additional resistor attached.
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Post by saltatempo on Dec 23, 2023 16:31:37 GMT
Ok Attachments:
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gerif
Junior Member
Posts: 76
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Post by gerif on Dec 23, 2023 21:14:31 GMT
The great divider needs the GND too! (i forgotten it before)
With baerd board you take GND from master module! When installing to the rack you need to connect to bus connector (H3)!
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