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Post by pt3r on Jun 21, 2024 9:30:20 GMT
When I try to use the vca in both of my modulators modules the output is seriously messed up, the audio is very quiet and deformed compared to all the othe vca's I have. What are these vca's supposed to be used for since I clearly can not use them with the output of le module. Am I the only person having 2 modulators modules that have broken VCA's?
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Post by leethargo on Jun 21, 2024 11:23:41 GMT
I only have one MODULATORS, but the VCA works as expected for me. If anything, the output is a bit louder than the ingoing signal.
Tested by sending sawtooth from 2OSC/d into VCA and using the square LFO from MODULATORS for "VCA MOD".
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Post by saltatempo on Jun 22, 2024 5:41:15 GMT
Hi. Mmm... I have tried with this control voltage flow: 5V to 2CVTOOL to VCAmod.
The audio signal seems "clipping downside" (I don't know the right words) when the control voltage exceeds 2,5 V...
The audio signal into VCAin also seems standing between zero and 2,5V, maybe centered at 1,25V (not sure)...
Maybe this VCA Is Better for CV flow, but other test would help.
With audio signal maybe keep in mind to put 2,5V to have maximum volume.
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Post by pt3r on Jun 22, 2024 8:06:49 GMT
Hi. Mmm... I have tried with this control voltage flow: 5V to 2CVTOOL to VCAmod. The audio signal seems "clipping downside" (I don't know the right words) when the control voltage exceeds 2,5 V... The audio signal into VCAin also seems standing between zero and 2,5V, maybe centered at 1,25V (not sure)... Maybe this VCA Is Better for CV flow, but other test would help. With audio signal maybe keep in mind to put 2,5V to have maximum volume. Thank you, I thought I was going crazy.  I discovered this when using Le module and it sounded all wrong, then I switched to both 2VCA and 4 VCA and there everything was smooth sailing. |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 691
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Post by namke on Aug 27, 2024 10:50:27 GMT
I'm glad I found this — I'm trying to debug some code in a module and wondered where the clipping was coming from — turns out that it's not my code after all, but the MODULATORS VCA 😢 Here it is being fed from the output of the FMOS (sine wave) and VCO (saw):   Any thoughts robertlanger ??  |
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Post by robertlanger on Aug 27, 2024 11:00:25 GMT
Oops, thanks for pointing this out! Will check it right away!
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Post by robertlanger on Aug 27, 2024 11:08:09 GMT
Interesting; the circuit anmd component values are 100% identical to the 2VCA in audio mode; now I have to check the actual boards, maybe a wrong component value?
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 691
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Post by namke on Aug 27, 2024 11:59:17 GMT
Interesting; the circuit anmd component values are 100% identical to the 2VCA in audio mode; now I have to check the actual boards, maybe a wrong component value? Thank you! In both of my cases I was feeding the VCA MOD input from the MODULATORS ENV output, in case there’s something odd happening with the CV control?? |
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Post by pt3r on Aug 28, 2024 7:07:00 GMT
Interesting; the circuit anmd component values are 100% identical to the 2VCA in audio mode; now I have to check the actual boards, maybe a wrong component value? Thank you! In both of my cases I was feeding the VCA MOD input from the MODULATORS ENV output, in case there’s something odd happening with the CV control?? If I remember correctly this is the exact situation that triggered my concern as well. I will try to see if I get the same result using a different ENV but I think the problem is more linked to the VCA than the ENV since I have used the modulator ENV with the 4VCA module without any issue. |
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Post by feijai on Aug 28, 2024 22:38:30 GMT
I have identified a problem with the bottom LFO in 2LFO (mine anyway) -- it clips on the bottom just like the VCA images shown here. The top LFO has a trimpot, but the bottom LFO does not and cannot be adjusted. Any chance the MODULATORS and 2LFO are sharing the same bug?
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Post by robertlanger on Sept 1, 2024 16:29:09 GMT
Ok, I have investigated the issue; seems there was a resistor soldered accidentally that should not be placed.
For the DIYers / techies: Remove R25 (47k, above the topmost pot), and all is good! Sorry guys!
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gerif
Junior Member
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Post by gerif on Sept 1, 2024 19:58:13 GMT
On which module R25 shall be removed? Is this instruction valid for all generations of that module?
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Post by saltatempo on Sept 2, 2024 12:06:26 GMT
Ok, I have investigated the issue; seems there was a resistor soldered accidentally that should not be placed. For the DIYers / techies: Remove R25 (47k, above the topmost pot), and all is good! Sorry guys! I'll try with my MODULATORS |
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Post by pt3r on Sept 3, 2024 10:40:06 GMT
How does one desolder smd components? I assume this resistor is an smd component right?
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Post by solipsistnation on Sept 3, 2024 15:15:14 GMT
How does one desolder smd components? I assume this resistor is an smd component right? Chances are you can just poke it with a hot soldering iron and it'll slide off. You need to be careful not to bridge its contacts with solder or to accidentally let it slide off and get stuck somewhere it shouldn't be, especially if components are close to one another. I haven't looked at a Modulators module myself yet but I can give more detail later if you haven't figured it out. |
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Post by leethargo on Sept 3, 2024 17:06:37 GMT
On my MODULATORS v1.1, I can see a R45 (SMD) with a 223 label on it (this means it's 22K, not 47K, right?) . It's really tiny!  It is above the top poti, but not directly. It is directly below the column of input sockets.It's so tiny that I'm not sure I'll attempt the fix. I can't imagine touching the solder points with the iron tip without also touching some unrelated parts... I'm not even sure if the fix is necessary for this version...
UPDATE: Never mind, Robert mentioned a R25 above, not R45, and I can't read  |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 691
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Post by namke on Sept 3, 2024 19:39:11 GMT
Ok, I have investigated the issue; seems there was a resistor soldered accidentally that should not be placed. For the DIYers / techies: Remove R25 (47k, above the topmost pot), and all is good! Sorry guys! Hmmm, I removed R25 and can’t really see a difference 😕 it seems that I get a nice clean signal matching the input if I supply about half-maximum voltage to the VCA MOD input though…  |
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Post by pt3r on Sept 4, 2024 7:44:01 GMT
I think, I will wait with poking a soldering iron at my modulators. Will first experiment with an attenuator on the vca cv.
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Post by solipsistnation on Sept 4, 2024 15:11:57 GMT
I think if you had some pointy cutters you could probably just clamp the resistor in the jaws and crunch through it. That might be not the best way but it would have less chance of accidentally desoldering anything else while you're heating it up.
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Post by pt3r on Sept 4, 2024 15:18:16 GMT
True, but according to the first findings of John the removal of R25 has not resulted in the expected improvements. I will keep an eye on this tread to see what more info shows up.
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Post by pt3r on Sept 4, 2024 18:45:26 GMT
The vca on the modulators module lets signals through if no cv is provide to the cv input. The 4 vca shows the same behaviour. The modulator env on the other hand is not capable of providing a meaningful envelope signal if I dial in some level of attack.
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Post by pt3r on Sept 6, 2024 11:37:52 GMT
Putting an attenuator between the cv signal and the modulator VCA makes it behave normally, if you provide a non attenuated 2ENV signal then the VCA distorts.
The Envelope of the modulator is only useable without attack, the more you dial in attack the lower the maximum voltage that is output, easy to see by connecting its output to a METER module or any other oscilloscope.
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Post by leethargo on Sept 10, 2024 13:20:04 GMT
I think if you had some pointy cutters you could probably just clamp the resistor in the jaws and crunch through it. That might be not the best way but it would have less chance of accidentally desoldering anything else while you're heating it up. Before going for the soldering iron, I tried simply holding on to the resistor with a pair of tweezers. This worked better than I expected, but I managed to accidently rip part of it off. I think it's just a cover with the label though... |
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Post by leethargo on Sept 10, 2024 13:21:51 GMT
Hmmm, I removed R25 and can’t really see a difference To be sure, is your MODULATORS also a v1.1? Maybe the fix only applies to specific versions. |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 691
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Post by namke on Sept 10, 2024 13:41:47 GMT
Hmmm, I removed R25 and can’t really see a difference To be sure, is your MODULATORS also a v1.1? Maybe the fix only applies to specific versions. yep, mine is a v1.1 — Robert didn’t mention that the fix was only for specific versions, so I had no basis to make that assumption. On your photo you can see R25, and that’s what I removed. |
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I discovered this when using Le module and it sounded all wrong, then I switched to both 2VCA and 4 VCA and there everything was smooth sailing.
