# MXR Phase 90 Guitar Pedal \> Eurorack / Kosmo Module? **URL:** \ **Category:** DIY STUFF\ **Created:** [June 28, 2021, 7:55pm UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708 "2021-06-28T19:55:13Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [June 28, 2021, 7:55pm UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708/1 "2021-06-28T19:55:13Z")
Can someone please tell me / show me what I would need to do on the schematic in order to make this MXR Phase 90 guitar pedal into a Eurorack/Kosmo module? Here’s the schematic: ![mxr-phase-90-script-logo-schematic-parts](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/e/ee41be1cff5c41a675ccc05b931c4e21ae85ce0e.png) ---
**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 28, 2021, 11:15pm UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708/2 "2021-06-28T23:15:29Z")
Add after input jack: ![schem_cgs60_sba_in](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/b/be92afed05b709aa275207fa858c56885eb76ae7.jpeg) Add before output jack: ![schem_cgs60_sba_out](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/6/6a932c195adcca0bacd13309c9f9fc61d7834c29.jpeg) (Power can be ±12 V) Replace battery with 9 V regulator, e.g. LM78L09: ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/e/e5c1ecf088a55201281082c078204aeb64f1a4b5.png) Note ICs in the pedal circuit are powered with +9 V and ground, not ±12 V. But TL071 in added circuit is powered with ±12 V. ---
**Author:** ![devicex](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/devicex/32/28_2.png) [@devicex](https://lookmumnocomputer.discourse.group/u/devicex)\ **Post date:** [June 28, 2021, 11:25pm UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708/3 "2021-06-28T23:25:24Z")
> **[S.B.G. Pedal Interface](https://www.perfectcircuit.com/alm-busy-circuits-sbg.html)** > > The ‘S.B.G’ is a compact utility module intended for the interfacing of guitar effect pedals with your Eurorack modular system. > **[A-138d Crossfader / Effect Insert](https://www.perfectcircuit.com/doepfer-a-138d.html)** > > Module A-138d can be used in two different ways; as a crossfader module within the A-100, or as an insert module for external effect units (e.g. guitar stomp boxes) with dry/wet control. [https://synthcube.com/cart/makers/ai-synthsesis/ai006-stomp-box-adapter](https://synthcube.com/cart/makers/ai-synthsesis/ai006-stomp-box-adapter) I have 2 of the A.I. synthsesis diy pedal adapters they were pretty cheap [$10 u.s. for pcb’s] that way you wouldn’t have to bugger the pedal up and you could plug and play any pedal . sadly they look like not in stock . ---
**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 28, 2021, 11:43pm UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708/4 "2021-06-28T23:43:52Z")
The AI Synthesis module is pretty much the same as Ken Stone’s module, which is where the schematics I included came from. I took @popflier’s post to mean they wanted to build a module using the pedal schematic. Indeed if instead they had an existing pedal and wanted to use it, the stomp box adapter module would be a better way to go. They’re in stock direct from AI Synthesis, it appears: > **[AI006 Eurorack Stomp Box Adapter - AI Synthesis](https://aisynthesis.com/product/ai006-eurorack-stomp-box-adapter/)** > > The AI006 Eurorack Stomp box Adapter is an updated take on a classic utility circuit that converts the higher signal levels of a modular system to be converted to the lower level signals that most stomp boxes are designed for. ---
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [June 30, 2021, 9:11am UTC](https://lookmumnocomputer.discourse.group/t/mxr-phase-90-guitar-pedal-eurorack-kosmo-module/3708/5 "2021-06-30T09:11:26Z")
Thank you! Yes, @analogoutput , you are correct. I was looking to modify the MXR schematic in order to create a module. While I do have several pedals I am not wanting to connect them to my modular. I would like a separate phase effect module. I might have a couple follow-up questions once I start modifying the schematic in a couple of weeks, if that’s okay.