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IC 

TL072

 

Potentiometer 

A100K

 

Resistors 

100K

 

Resistors 

330R

 

 
 

 

Summary of Contents for AI002

Page 1: ...he Build Guide for the AI002 Mixer you can purchase it by going to http aisynthesis com product eurorack audio and cv mixer Table of Contents 1 Resources 2 About the Mixer 3 Tools Needed 4 BOM 5 Build Steps 1 Resources 1 Schematic 2 About the Mixer ...

Page 2: ... audio and or cv signals This mixer could be used to feed multiple oscillators into a filter or to feed multiple cv sources into for instance the cv in of a filter The circuit itself is quite simple and uses two Operational amplifiers in a unity gain inverting configuration The P1 4 pots attenuate the input signal then feed it through 100k resistors for protection into the first op amp which mixes...

Page 3: ...r Diagonal Cutters Micro Shears Precision Screwdriver Set slotted screwdriver 4 BOM Category Part Quantity Capacitor 47pf 2 Capacitor 1uF 2 Hardware 3 5mm Thonkiconn Jack 4 Hardware Jack Nuts 4 Hardware 5 pin Header 2 Hardware 8 PIN Socket 1 Hardware Panel 1 Hardware PCB 1 ...

Page 4: ...IC TL072 1 Potentiometer A100K 4 Resistors 100K 5 Resistors 330R 1 ...

Page 5: ...items when there aren t taller things to get in the way In this case it means starting with the resistors Start by soldering the 330R resistor and the five 100k resistors There is a video tutorial here https youtu be Z0h_qF oOGc Resistors are pretty near indestructible so take your time Heat the connection for about half a second before you apply solder This pre heating will prevent the molten sol...

Page 6: ...for another half second and pull the iron away If the solder doesn t flow easily perhaps you haven t allowed your iron to warm up or you need to clean your iron tip I like a temperature of about 550 degrees Fahrenheit 287 Celcius for leaded solder 3 Let s move on to the IC Socket not the IC We use sockets because some ICs are susceptible to damage from heat The socket serves as a simple plug for t...

Page 7: ...IC and bend the tips on the rear of the pcb to hold it in my place while you solder 4 With the resistors and socket in place we ll solder in the capacitors Start with the 1uf caps There was an issue with the PCB printing and the cap values were not printed This will be ...

Page 8: ...corrected in future builds and we deeply regret the error ...

Page 9: ...5 This image shows which pair of caps go where Solder the two 1uF caps ...

Page 10: ...6 Then solder in the 47pF caps ...

Page 11: ...ks They only fit in one way 8 Time for the potentiometers These are your knobs and will also mount the PCB to the panel along with the jacks Before you solder them user your cutters to snip off the tab that comes on the pot ...

Page 12: ...t as close to 90 degrees from the PCB as you can but the pins are a bit flexible so they can be fudged Don t fudge too much though or the pins will break and you ll need a new pot These pots are all A100k so it doesn t matter which pot ...

Page 13: ...ere snugly and flush against the socket with the black dot near and to the left of the socket notch 10 Solder in the two rows of 5pins into the solder holes This is where you will apply power to the module don t do it yet though You may want to insert the two header rows into the ...

Page 14: ...ulti meter Assuming there is no continuity there you are good to apply power Eurorack tragically has no universal power connector format This has resulted in far too many blown up modules AI synthesis modules follow the most common format in which there is a white stripe next to the negative end of the power connector and this is typically where the red stripe of the power cable should be aligned ...

Page 15: ...counter clock wise attenuation is applied to the signal and it is lowered The lower center pot regulates feedback resistance of the IC At center the signal is roughly at unity the same volume as coming in minus the 100k input protection resistors Past unity turning this knob up will eventually cause distortion and erratic signal This can be fun Insert a signal from an oscillator or mp3 player into...

Page 16: ... want to loosen the set screws to put them on and then adjust them I like to put them on with the knobs turned fully counter clockwise but you can do it however you like Potentiometers are only precise to 1 20 so it s not overly critical Once they are on where you want them tighten the set screws Test again and enjoy your new mixer 15 Share your build on Facebook https www facebook com AI Synthesi...

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