Commit 262ddc56 authored by David Huss's avatar David Huss 💬

Update README.md

parent 59054777
......@@ -2,15 +2,15 @@
A set of modular PCBs that can be used to create a custom configuration for a Matrix Mixer. A Matrix mixer allows you to mix you any input to any output at the same time.
![](images/final.jpg)
<img src="images/final.jpg" height="600px" width="auto">
If you have for example a 4x4 Matrix Mixer, you have 16 knobs with each controlling a how much of a given input signal (`1-4`) will be mixed into a given output (`A-D`):
![](images/4x4-matrix.png)
<img src="images/4x4-matrix.png" height="600px" width="auto">
For example by turning up the knob at the intersection between Input `2` and Output `B` we can mix all of the signal present at the input to the output. If we turn up another knob at another intersection, the signal will be present at both outputs:
![](images/matrix-examples.png)
<img src="images/matrix-examples.png" height="600px" width="auto">
This makes Matrix mixers extremely flexible and allows for many possible combinations and use cases.
......@@ -54,13 +54,13 @@ Provides two 3.5mm Mono output jacks, with a Jumper (or switch) each row of tile
| <img src="gerbers/MAMI-OUTPUT_Combined_Top.png" height="200px"> | <img src="gerbers/MAMI-OUTPUT_Combined_Bottom.png" height="200px"> | <img src="images/3d-output.png" height="200px"> |
The summing section looks like this and allows a jumper (`J_ATT1` and `J_ATT2`) or a switch (2.54mm lead spacing) to be used to switch between unipolar and bipolar attenuation for each row seperately.
![](images/schematic_summing.png)
<img src="images/schematic_summing.png" height="600px" width="auto">
### Erata Output Module rev. 1.0 (has been fixed in 1.1)
- Silkscreen for Vee and Vcc is swapped!
- `R4` and `R8` should have a value of 100 Ω not 100 kΩ (or bridge it with solder)
- Connector `J_W` was flipped by 180° (this however depends on which side you want your outputs). Solve it like this (just make sure the silkscreen labels connect to the right bus): ![](images/bus-wiring.jpg)
- Connector `J_W` was flipped by 180° (this however depends on which side you want your outputs). Solve it like this (just make sure the silkscreen labels connect to the right bus): <img src="images/bus-wiring.jpg" height="600px" width="auto">
# Panels
......@@ -73,4 +73,4 @@ Use the python code in [calculate-parts.ipynb](https://code.hfbk.net/sdiy/mami/b
# Power-Supply
The MAMI needs a fitting ±12V Power supply. This obviously depends on the size you are going for. Anything up to 10x10 should be able to be powered by the [3WPSU](https://code.hfbk.net/sdiy/3wpsu) with a USB-B Phone Charger as one output module should use about 10mA (to be verified) and the 3WPSU is able to deliver up to 125mA per rail.
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The MAMI needs a fitting ±12V Power supply. This obviously depends on the size you are going for and which opamp you use – one Output-Module with 2 channels and a LME49720 draws ~20mA. Anything up to 10x10 should be able to be powered by the [3WPSU](https://code.hfbk.net/sdiy/3wpsu) with a USB-B Phone Charger, as the 3WPSU is able to deliver up to 125mA per rail.
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