# Interfacing envelope generator

**URL:** <https://lookmumnocomputer.discourse.group/t/interfacing-envelope-generator/4941>\
**Category:** DIY STUFF\
**Created:** [April 26, 2022, 9:57am UTC](https://lookmumnocomputer.discourse.group/t/interfacing-envelope-generator/4941 "2022-04-26T09:57:43Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bearjumpjump](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@Bearjumpjump](https://lookmumnocomputer.discourse.group/u/Bearjumpjump)\
**Post date:** [April 26, 2022, 9:57am UTC](https://lookmumnocomputer.discourse.group/t/interfacing-envelope-generator/4941/1 "2022-04-26T09:57:43Z")

</div>

Hello guys,  
Once again im asking your help, hehe

— How to connect this cool Mr.Rene Schmidt’s envelope generator Fastest Envelope in the West to my ldr synth?

— Where is “gate in” in the ldr synth schematic? Is it located after momentary switch?

I already make ldr synthesizer based on lm358 filter (schematic by Pete Mc Bennett), it sounds cool, but i want it has adsr function.

Fastest envelope in the west schematic by Mr.Rene Schmidt :

 ![fastest envelope from the west_page-0001](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/1/7/1716fc703c7d80e6495e56a153984f094d171140.jpeg)

Ldr synth, schematic by Pete Mc Bennet

 ![LDRsynth](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/f/6/f61e079bc7e10aa30d6f3e53f4f8f761262137d0.jpeg)

My progress :

[![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/4/7/47ef397e36240d96a6e32114f53f2ffd239bf9ff.jpeg "Sun O)))") ](https://www.youtube.com/watch?v=Gs5zUfe_xEg)

Im still confuse, but ill never give up

Thankk you so much for your help guys.

---

<div class="post-metadata">

**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:** [April 27, 2022, 12:43am UTC](https://lookmumnocomputer.discourse.group/t/interfacing-envelope-generator/4941/2 "2022-04-27T00:43:32Z")

</div>

The McBennet circuit doesn’t generate a gate signal, all the push buttons do is to change which resistance is used in the oscillator. I can’t think of a simple way to modify it to get a gate signal out.

(You could replace the push buttons with DPST ones, and use the second pole to make a gate by some means such as connecting ground when pushed, and using a pullup resistor to connect +12 V (or +9 V or whatever you’re using) when no buttons are pushed, and then an NPN transistor to invert and buffer that. Not all that simple, having to retrofit different buttons, but maybe not all that hard.)

---

<div class="post-metadata">

**Author:** ![Bearjumpjump](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@Bearjumpjump](https://lookmumnocomputer.discourse.group/u/Bearjumpjump)\
**Post date:** [April 27, 2022, 7:48am UTC](https://lookmumnocomputer.discourse.group/t/interfacing-envelope-generator/4941/3 "2022-04-27T07:48:26Z")

</div>

Alright, sounds complicated indeed  
Hehe  
I think i’ll pass adsr stuff  
Thank you sir 🙏🙏