|
|
Post by funbun on Dec 1, 2021 13:17:34 GMT
What would it take to port all the Yusynth-EddyBergman modules to AE modular? I guess the biggest thing is getting everything down to 5V from 12/15V. Is it just a matter of using OpAmps to get things down to 5V or does it take a complete redesign? I have a big breadboard, lots of components. Just never started because I'm just getting settled into the new house.
Thinking of where I want to go with my AE Modular. Building my own is the next step.
|
|
|
|
Post by keurslagerkurt on Dec 2, 2021 19:30:24 GMT
It is really a module specific process. I won't say it's very hard (i only started learning about electronics two years ago!), but you do need to get a hang of it.
Main thing is indeed the op-amps. All TL0XX's have to go out, MCP60XX's replace them. Most grounds get swapped with 2.5V. -12's become ground, +12's become 5V. It's good to have your opamp basics in check, you have to know how they are used on the original circuits, so it's important to learn to spot which one is used as inverter, which one as summer, integrator, buffer, rescaler,..
Not all circuits are possible to port tho. Things based on specific IC's that don't run on 5V for example. So that would be stuff like the CEM3340 VCO's, electrodruid chip based LFO's, VCA's or filters. Things like a diode ladder filter will be hard as well, as each diode has a fixed voltage drop of 0.6V and 5V runs out of gas quickly with those.
But i'd be happy to help you out here if you have a specific circuit of Eddy in mind. I'd happily explain you which values i'd adjust and why, and probably i'll make mistakes along the way as well and learn with you 😃 the thing with breadboard is that is so forgiving to experiment, and as such it's a great way to learn analog electronics.
|
|
pol
Wiki Editors
Posts: 1,349
|
Post by pol on Dec 2, 2021 19:57:18 GMT
What would it take to port all the Yusynth-EddyBergman modules to AE modular? I guess the biggest thing is getting everything down to 5V from 12/15V. Is it just a matter of using OpAmps to get things down to 5V or does it take a complete redesign? I have a big breadboard, lots of components. Just never started because I'm just getting settled into the new house. Thinking of where I want to go with my AE Modular. Building my own is the next step. Sorry if I misunderstand the purpose, but could you "just" design a module that will convert from one format to the other, e.g. a 0-5V signal will go 0-15V in proportion? I would imagine triggers are easy enough, it will be CVs.... |
|
|
|
Post by keurslagerkurt on Dec 3, 2021 11:00:38 GMT
Oh yeah, maybe i misunderstood it? If you have a +-12/15V PSU, you can indeed build the original units, and then use a rescaler for each input/output. For example, +-15V VCO output to 0-5V would be a fairly simple opamp circuit, featuring a TL072 to rescale the voltage to +-2.5V, then a cap + resistor to bias the voltage around +2.5V (for AE), and maybe a buffer (but not really needed unless you want ultimate volume stability). If this is what you want, I could also whip up a quick example that you can build on the breadboard to test it out and adapt it to your needs. But if you rather explore it yourself, you will just need an inverting opamp config like the left one here:  With a gain (A) that is equal to 5V/30V = 0.1666.. Then after that stage a capacitor and resistor combo for biasing (see my Quad Boost schematics output stage to get an example). This to get the VCO oscillating around 2.5V instead of 0V. You will also need a simple MCP6002 or TL072 to provide the 2.5V reference in a buffered way. So a voltage divider generating 2.5V from your 5V supply, and then an opamp in buffer configuration attached to it. Output of the opamp is your (relatively) stable 2.5V. Stable enough for AE audio use at least. (its fine to use this same buffer for a lot of outputs) Last stage could be an MCP6002 as buffer, and also a diode going from the output to 5V (this prevents voltages ABOVE 5.xV, which should be safe enough), and a diode going from the ground to your output (prevent negative voltages). Diodes should ideally have only a small voltage drop, which you can find in their datasheet. Most people use Schottky diodes for this. |
|
|
|
Post by funbun on Dec 3, 2021 15:17:16 GMT
No, all I have is my AE Modular. I'm talking about adapting all the modules from scratch to use natively within AE Modular. Mainly I'm interested in building a comparator and a ring modulator.
But, your idea of making the Yusynth modules, then just having an adapter module might be a much easier path.
Are their many 0-5V designs out there? I'm just so afraid of burning my house down, I'd much rather stick with AE modular since there is zero negative voltage in the case.
|
|
pol
Wiki Editors
Posts: 1,349
|
Post by pol on Dec 3, 2021 18:57:57 GMT
Oh yeah, maybe i misunderstood it? If you have a +-12/15V PSU, you can indeed build the original units, and then use a rescaler for each input/output. For example, +-15V VCO output to 0-5V would be a fairly simple opamp circuit, featuring a TL072 to rescale the voltage to +-2.5V, then a cap + resistor to bias the voltage around +2.5V (for AE), and maybe a buffer (but not really needed unless you want ultimate volume stability). If this is what you want, I could also whip up a quick example that you can build on the breadboard to test it out and adapt it to your needs. But if you rather explore it yourself, you will just need an inverting opamp config like the left one here: <button disabled="" class="c-attachment-insert--linked o-btn--sm">Attachment Deleted</button> With a gain (A) that is equal to 5V/30V = 0.1666.. Then after that stage a capacitor and resistor combo for biasing (see my Quad Boost schematics output stage to get an example). This to get the VCO oscillating around 2.5V instead of 0V. You will also need a simple MCP6002 or TL072 to provide the 2.5V reference in a buffered way. So a voltage divider generating 2.5V from your 5V supply, and then an opamp in buffer configuration attached to it. Output of the opamp is your (relatively) stable 2.5V. Stable enough for AE audio use at least. (its fine to use this same buffer for a lot of outputs) Last stage could be an MCP6002 as buffer, and also a diode going from the output to 5V (this prevents voltages ABOVE 5.xV, which should be safe enough), and a diode going from the ground to your output (prevent negative voltages). Diodes should ideally have only a small voltage drop, which you can find in their datasheet. Most people use Schottky diodes for this. This started going over my head after Oh Yeah, but it sounds/looks really good,  |
|
|
|
Post by keurslagerkurt on Dec 3, 2021 19:07:19 GMT
No, all I have is my AE Modular. I'm talking about adapting all the modules from scratch to use natively within AE Modular. Mainly I'm interested in building a comparator and a ring modulator. But, your idea of making the Yusynth modules, then just having an adapter module might be a much easier path. Are their many 0-5V designs out there? I'm just so afraid of burning my house down, I'd much rather stick with AE modular since there is zero negative voltage in the case. Comparator should be an easy one to be honest! Ring modulator: haven't dived in this ones, so not really sure, but I know that some users here have build some with a small transformer, so should def not be too hard. No need to be afraid to burn your house down! Thats really not possible if your working with low voltages like everything from 15V & below. You might occasionally smoke a chip, but as long as you turn off your breadboard power when youre not there, nothing can go wrong. Very worst case you can kill your AE Power module I guess. But even that could be avoided by for example using a battery to power your breadboard circuits first. Or a small bench power supply with current limiting. If you post a specific schematic you'd want to adapt, i'll be happy to give you some pointers! |
|
|
|
Post by keurslagerkurt on Dec 3, 2021 19:09:59 GMT
On 5V designs out there:
there are a lot out there, but they are almost all digital focused designs (because microcontrollers & classic digital IC's mostly run on 5V or below).
Most classic analog circuits out there run on more than 5V, mainly for historical reasons I think. Most are def adaptable to 5V, but you do need understanding of how the circuit works. Or of course some trial and error approach on the breadboard.
|
|
|
|
Post by keurslagerkurt on Dec 3, 2021 19:29:59 GMT
Sorry for hi-jacking this thread, but just had a look at the comparator by Yusynth you suggested funbunGood news is, it basically has the same topology as the Five Steps (which also provides gate + trigger outs), except Five Steps has five of these BUT has no control over the threshold voltage (its fixed in FS). This module looks super useful and is SUPER EASY to port to AE I believe! I had a good look, and you should just do as follows: 1) all -15V becomes 0V in AE. 2) all ground becomes 2.5V. 3) all +15V becomes 5V 4) LM324 gets changed with MCP6004 5) Best to replace 1N1418 diodes with Schottky diodes (like 1N5817). 1N4148 will work, but the 0.6V voltage drop across these might make your triggers too weak. 6) Leave the resistors to ground & ground connection out at the Trigger outputs. Just use one small resistor like 220 ohm (220R). I've drawn it a bit here, but was too lazy to draw all 220R's with my laptop   Good way to generate the 2.5V:  This is a great circuit to try out on the breadboard tbh! |
|
