Hi to the community,
My band and I want to record our new album. After some hours with virtual fader and knobs I thought about a "big" MIDI controller.
I'm obsessed of this idea! I've started to plan my project and want to share it here with you (and hopefully I get some inspiration ).
1. The Mixer
On Ebay I've searched for a cheap broken mixer and found a nice 24-channel mixer out of the 80s.
Specifications:
- 24 channels
-- each has 8 rotary potentiometer + 1 fader + 1 button
- 2 effect channels
-- each has 1 fader + 2 rotary potentiometer, the other 1 fader + 1 rotary potentiometer
- 2 master channel
-- each has 3 rotary potentiometer + 1 fader
- 1 Monitoring channel
-- 3 rotary potentiometer + 1 button + 1 fader
all in all
- 29 fader (4.7kOhm)
- 204 knobs (rotary potentiometer/ 10kOhm and 50kOhm / 24 of them have 6 legs which include 2 potentiometer)
- 25 buttons (not real switches, only push button switches)
2. The Plan
I want to use a Teensy 3.6. On any analog pin (23 pins, the SMD pins are not touched) should be a 74HC4051 multiplexer. With this configuration it will be possible to route 184 analog devices. All in all I need 256 analog inputs.
To get some mute or solo buttons I will remove 2 lines of rotary potentiometers and substitute them with toggle switches. If I do it in this way I need 181 analog inputs and minimum 48 digital ones. If I use 3 position toggle switches (on-off-on) I will use 96 digital inputs.
Finally, I need 181 analog inputs and 96 digital inputs.
That are quite a lot of inputs and I have to multiplex. For the multiplexing I need 34 multiplexer (23 for analog and 12 for digital). The 74HC4051 will be the multiplexer for this project.
To have enough power and minimize the latency I will use the Teensy 3.6.
3. The Questions
Does the Teensy 3.6 handle 277 multiplexed inputs or will be better to use 2 micro controller connected via SPI to get a low latency?
Do I need an external power supply?
I calculated with 10kOhm potentiometers and 180 Inputs. R=U/I; I = U/R; I=3,3V/10000VA; I=0,059A;
Is this calculation correct?
Thanks for reading and ideas are welcome!
Dinera
PS: I will give you updates like circuit diagram, pcb design, problems, current state, etc.
My band and I want to record our new album. After some hours with virtual fader and knobs I thought about a "big" MIDI controller.
I'm obsessed of this idea! I've started to plan my project and want to share it here with you (and hopefully I get some inspiration ).
1. The Mixer
On Ebay I've searched for a cheap broken mixer and found a nice 24-channel mixer out of the 80s.
Specifications:
- 24 channels
-- each has 8 rotary potentiometer + 1 fader + 1 button
- 2 effect channels
-- each has 1 fader + 2 rotary potentiometer, the other 1 fader + 1 rotary potentiometer
- 2 master channel
-- each has 3 rotary potentiometer + 1 fader
- 1 Monitoring channel
-- 3 rotary potentiometer + 1 button + 1 fader
all in all
- 29 fader (4.7kOhm)
- 204 knobs (rotary potentiometer/ 10kOhm and 50kOhm / 24 of them have 6 legs which include 2 potentiometer)
- 25 buttons (not real switches, only push button switches)
2. The Plan
I want to use a Teensy 3.6. On any analog pin (23 pins, the SMD pins are not touched) should be a 74HC4051 multiplexer. With this configuration it will be possible to route 184 analog devices. All in all I need 256 analog inputs.
To get some mute or solo buttons I will remove 2 lines of rotary potentiometers and substitute them with toggle switches. If I do it in this way I need 181 analog inputs and minimum 48 digital ones. If I use 3 position toggle switches (on-off-on) I will use 96 digital inputs.
Finally, I need 181 analog inputs and 96 digital inputs.
That are quite a lot of inputs and I have to multiplex. For the multiplexing I need 34 multiplexer (23 for analog and 12 for digital). The 74HC4051 will be the multiplexer for this project.
To have enough power and minimize the latency I will use the Teensy 3.6.
3. The Questions
Does the Teensy 3.6 handle 277 multiplexed inputs or will be better to use 2 micro controller connected via SPI to get a low latency?
Do I need an external power supply?
I calculated with 10kOhm potentiometers and 180 Inputs. R=U/I; I = U/R; I=3,3V/10000VA; I=0,059A;
Is this calculation correct?
Thanks for reading and ideas are welcome!
Dinera
PS: I will give you updates like circuit diagram, pcb design, problems, current state, etc.