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.
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.
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`):
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`):
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:
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:
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.
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.
### Erata Output Module rev. 1.0 (has been fixed in 1.1)
### Erata Output Module rev. 1.0 (has been fixed in 1.1)
- Silkscreen for Vee and Vcc is swapped!
- 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)
-`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): 
- 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): <imgsrc="images/bus-wiring.jpg"height="600px"width="auto">
# Panels
# Panels
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@@ -73,4 +73,4 @@ Use the python code in [calculate-parts.ipynb](https://code.hfbk.net/sdiy/mami/b
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@@ -73,4 +73,4 @@ Use the python code in [calculate-parts.ipynb](https://code.hfbk.net/sdiy/mami/b
# Power-Supply
# 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.
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.
