# 1157 MINI ADSR Module **URL:** \ **Category:** KOSMO MODULES\ **Created:** [March 6, 2020, 7:08pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359 "2020-03-06T19:08:29Z")\ **Posts on this page:** 20\ **Page:** 3
**Author:** ![Farabide](https://avatars.discourse-cdn.com/v4/letter/f/ecc23a/32.png) [@Farabide](https://lookmumnocomputer.discourse.group/u/Farabide)\ **Post date:** [March 12, 2020, 10:34am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/41 "2020-03-12T10:34:12Z")
Been there, done that, never did get the T-shirt! ---
**Author:** ![twinturbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)\ **Post date:** [March 13, 2020, 10:33pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/42 "2020-03-13T22:33:51Z")
quick one as I can’t be ARSD to look…(Have I invented a Geek Synth Term) is the MOM to the top of the PCB and Latch to the bottom or the other way round. Switches here 🙂 Rob ---
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [March 13, 2020, 10:41pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/43 "2020-03-13T22:41:57Z")
Doesn’t matter, really – both directions go to the same input (gate/trigger) so it’s up to you what you prefer. ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/078e4d7f99889561f3f9a34bd8b94e8b0dfd3bc4.png) ---
**Author:** ![twinturbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)\ **Post date:** [March 13, 2020, 10:53pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/44 "2020-03-13T22:53:35Z")
Ahh Perfect… Will have that finishe tomorrow then, bar the knobs. Rob ---
**Author:** ![JonGreen](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jongreen/32/203_2.png) [@JonGreen](https://lookmumnocomputer.discourse.group/u/JonGreen)\ **Post date:** [March 14, 2020, 2:43am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/45 "2020-03-14T02:43:55Z")
Oh yeah! These things went together easy as pie once the (On) - off - On switches turned up! ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/434571104592a95f276a1549502f99ad96cd6548.jpeg) ---
**Author:** ![Maxhirez](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/maxhirez/32/42_2.png) [@Maxhirez](https://lookmumnocomputer.discourse.group/u/Maxhirez)\ **Post date:** [March 14, 2020, 11:11am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/46 "2020-03-14T11:11:42Z")
> [@Farabide](#): > > Been there, done that, never did get the T-shirt! That’s because you didn’t click “Submit my order.” (Yes, Jason, that was the joke…) ---
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [April 17, 2020, 11:38pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/47 "2020-04-17T23:38:06Z")
Never followed up in this one, but @Dud just posted a drawing: > [@Mini adsr switch trick](https://lookmumnocomputer.discourse.group/t/mini-adsr-switch-trick/655): > > Nothing revolutionary but can maybe helped some. For those like me who build this module with a stripborad or at least a diy panel this is a little trick for the cursed switch! a normal switch (on / off / on not momentary) + a push switch button for manual trigger that’s how i did it [Sans titre] ---
**Author:** ![opavel](https://avatars.discourse-cdn.com/v4/letter/o/7cd45c/32.png) [@opavel](https://lookmumnocomputer.discourse.group/u/opavel)\ **Post date:** [June 6, 2020, 4:03pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/48 "2020-06-06T16:03:43Z")
Hello everyone Run into a problem. I only have negative output in my mini ADSR module. I checked all the connections and also replaced R12 and R15. Didn’t seem to help. Would be grateful to hear any advice. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [June 6, 2020, 4:23pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/49 "2020-06-06T16:23:57Z")
hello sos breakdown service I listen, I will give you a specialist as soon as it is available, good day to you (joke) ---
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [June 6, 2020, 4:43pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/50 "2020-06-06T16:43:33Z")
> [@opavel](#): > > I only have negative output As in “only the negative output is working” or “all outputs are negative”? Do you have signal at pin 7? Are pins 5, 6, and 7 properly soldered, and properly seated in the socket (if in doubt, check continuity from IC pin to solder joint). ---
**Author:** ![opavel](https://avatars.discourse-cdn.com/v4/letter/o/7cd45c/32.png) [@opavel](https://lookmumnocomputer.discourse.group/u/opavel)\ **Post date:** [June 6, 2020, 6:00pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/51 "2020-06-06T18:00:29Z")
Should have been more specific. Only negative output is working, all three positive outputs are not. I checked positive pins with oscilloscope and no signal, just flat line. Reheated the solder on 5,6,7. I think checking the continuity from the IC socket will be my next step. Thanks for your advice anyway ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 6, 2020, 6:06pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/52 "2020-06-06T18:06:58Z")
What the positive outputs have in common, but not the negative, are R12, R15, and pins 5, 6, and 7 on the TL072. Try focusing on them. ---
**Author:** ![Mechamilk](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/mechamilk/32/150_2.png) [@Mechamilk](https://lookmumnocomputer.discourse.group/u/Mechamilk)\ **Post date:** [June 17, 2020, 4:54pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/53 "2020-06-17T16:54:21Z")
Hello, i buit the circuit following the schematic but i have an output envelope only if i touch the metal d-shaft of the potentiometers with my fingers. ☹ What could be the cause of this? I share all GND of the potentiometers and i tried adding the 100nf caps. Thank you. P.S. i didn’t use the opamp and i have only 1 out at the moment. ---
**Author:** ![sebastian](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sebastian/32/39_2.png) [@sebastian](https://lookmumnocomputer.discourse.group/u/sebastian)\ **Post date:** [June 17, 2020, 5:26pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/54 "2020-06-17T17:26:15Z")
Sounds like a grounding issue… have you connected the shared ground from the potentiometers to the ground on your stripboard? ---
**Author:** ![Mechamilk](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/mechamilk/32/150_2.png) [@Mechamilk](https://lookmumnocomputer.discourse.group/u/Mechamilk)\ **Post date:** [June 17, 2020, 7:51pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/55 "2020-06-17T19:51:13Z")
I checked again and i replaced a potentiometer… aaaand i found a pin of the socket chip was not soldered correctly. It works now. 😉 Thank you. ---
**Author:** ![Caustic](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/caustic/32/15588_2.png) [@Caustic](https://lookmumnocomputer.discourse.group/u/Caustic)\ **Post date:** [June 17, 2020, 8:37pm UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/56 "2020-06-17T20:37:25Z")
It sucks to have to comb through everything sometimes, but usually it ends up being one of these things. I am glad you have a working module now! ---
**Author:** ![sebastian](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sebastian/32/39_2.png) [@sebastian](https://lookmumnocomputer.discourse.group/u/sebastian)\ **Post date:** [June 23, 2020, 9:14am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/57 "2020-06-23T09:14:44Z")
I was looking at the LED driver for the output and input: ![Screenshot from 2020-06-23 11-09-35](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/e/ed8808e49fae3e5e81359fb54b3857f72d6d8b0d.png) In the kassutronics asr he uses a similar setup, but with different values: ![Screenshot from 2020-06-23 11-10-55](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/e/e40be4d63f741d9f0cdb936b398abf35c48ddefa.png) For the LED okai, different LEDs, different preferences for brightness, but the one before the transistor? Also: Why does Caspar split the resistors in the “LED path” into two before and after Q1? ---
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [June 23, 2020, 10:34am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/58 "2020-06-23T10:34:05Z")
The difference is the emitter voltage, I think. In the first design, the emitter will never go above the LED’s forward voltage (the resistor takes the rest of the 12 V, minus a tiny drop across the transistor), in the latter part of the 12 V will be dropped across the 2k2 resistor. Since a transistor works as an amplifier until the base voltage exceeds the emitter voltage with about 0.6 V, at which point it turns into a switch, the second design turns fully on (saturates) a bit later. EDIT: Well, ok, it starts conducting earlier as well, since the emitter voltage will increase linearly as the current through the transistor increases, unlike for the very non-linear LED. It’s basically using the transistor as an amplifier, instead of using it as a switch (it’ll still saturate at higher voltages, since there’s no biasing on the base side of things, but you get a larger usable range). ---
**Author:** ![Caustic](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/caustic/32/15588_2.png) [@Caustic](https://lookmumnocomputer.discourse.group/u/Caustic)\ **Post date:** [June 25, 2020, 3:05am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/59 "2020-06-25T03:05:24Z")
So, per the dumbass thread: > [@A litany of dumbassery](https://lookmumnocomputer.discourse.group/t/a-litany-of-dumbassery/526/103): > > Tonight I decided to get around to makin the Kosmo ADSR. Everything went great, but at the last second i soldered the chip sockets in on the wrong side. Managed to de-solder the sockets, but now im going to have a hell of a time getting this sorted. It was going so well too! Anyone have any experience with this and maybe have some pointers? @fredrik? Im just glad i noticed before frying the damn ADSR chip. I managed to clean out the holes enough to put the chips in. Plugged it in and immediately unplugged. Thankfully, the first thing i test whenever there is a sketch build is: “does the op-amp get hot”? I dont plug in anything else until i rule that out. Thankfully, since after plugging this thing in, it was scorchy. Afterwards, i test continuity and everything seems to be connected per the schematic. Connectivity to ground, +12, -12 are where i expect them to be. I think i might just have to call this a loss. At first i thought i must have put the cursed opamp in backwards but it was not the case. Ill have to keep lookin’ and stuff, but given that i kinda botched the chip soldering by originally doing it on the wrong side and having to de-solder etc, i think its time to call it. 🙂 ---
**Author:** ![ChristianBloch](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/christianbloch/32/56_2.png) [@ChristianBloch](https://lookmumnocomputer.discourse.group/u/ChristianBloch)\ **Post date:** [June 25, 2020, 3:17am UTC](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359/60 "2020-06-25T03:17:36Z")
Don’t give up! Surely it can be salvaged. [Previous page](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359.md?page=2) [Next page](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359.md?page=4)