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Update 'Future Modules'

gdorn 2022-09-02 02:36:16 +00:00
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Future-Modules.md

@ -10,8 +10,9 @@ Pretty confident we do these in this order next.
* Compare to online 8-note sequencers (baby 8)
* Either build online 8-note schematic, or extend MK's 5-note to 8-note.
* padding MK's out to 8 notes means roughly $16-20 in parts, depending on PCB choice
* could also go to 10 steps, but no more (uses a decade counter)
#### Bergman's 10-step sequencer
#### Bergman's 10-step sequencer (up to 10)
* https://www.eddybergman.com/2022/04/8-step-sequencer-v2.html
* can do up to 10 steps with the hardware to support it
@ -28,8 +29,8 @@ Pretty confident we do these in this order next.
## VCA
#### MK's VCA
* Probably a straightforward build, one op-amp, four transistors and some supporting components.
* ~$6 in parts, needing only one 74 and support components, so tiny PCB should be fine
* Probably a straightforward build: one op-amp, four transistors and some supporting components.
* ~$6 in parts, needing only one tl074 and support components, so tiny PCB should be fine
# More distant future
Less confident about the order or selection of these, though we do know we need a noise and envelope generator and a S&H would be nice.
@ -44,7 +45,11 @@ Lots of options for this one, but many people have at least two LFOs anyway.
## Quantizer
Something to take CV in, round it to the nearest 1/12th of a volt (or whatever, if it's digital), and send it back out.
Something to take CV in, round it to the nearest 1/12th of a volt (or whatever, if it's digital), and send it back out. Often these are digital, as it is far easier to build flexibility and precision into a module with a microcontroller. But this may be an entirely reasonable first digital project, teaching:
* I2C or other chip communication protocols
* Interfaces to digital components and the hazards therein
* programming MCs to be operated in a circuit outside the full dev board (in some cases)
#### Arduino + DAC
@ -55,7 +60,13 @@ Something to take CV in, round it to the nearest 1/12th of a volt (or whatever,
** https://www.quinie.nl/hagiwo-quantizer-how-does-it-work-a-bit-of-background/
** https://note.com/solder_state/n/nde97a0516f03
** arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware
* https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller, but also using filtered PWM for a DAC, a curious choice worth looking into more.
#### Microcontroller and smoothed PWM
* https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC.
* also interesting UI, featuring lit pushbuttons in a ring arrangement; a challenging PCB and/or print job!
* see PDF at https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with buffering between (some) stages.
* "By setting the supply voltage to a special value of nominally 5.333V (higher than the usual 5V, but within spec for the MCU), the PWM output gets scaled to exactly 24 steps per Volt." - This is a common trick even when using a DAC, and makes an otherwise low-precision 8-bit DAC way more than suitable for the task.
#### MK's quantized arpeggiator
@ -123,6 +134,9 @@ Everybody needs several VCFs with different behaviors.
** CA3080 High-Performance Operational Transconductance Amplifiers - not a jellybean, so $3/ea for sketchy NOS on amazon
** CA3080 design is ancient; maybe an updated one exists with current ICs?
## CV Generators
#### [Ornament & Crime](https://ornament-and-cri.me/) a highly recommenced "polymorphic CV generator"
## Wave Shaper
#### Wave Folder using LM13700: https://kassu2000.blogspot.com/2021/11/wavefolder.html
@ -145,7 +159,7 @@ Everybody needs several VCFs with different behaviors.
Generate an envelope from an audio source instead of the reverse.
## Envelope Overkill
See Make Noise's Maths, Ken Stone's predecessor, etc. "Lightning bolt generator".
See Make Noise's Maths, Ken Stone's predecessor (Serge), etc. "Lightning bolt generator".
## Physical Reverb
See LMNC's dabbling in physical reverb using springs and motors; anybody turn that into something more finish, preferably without needing a separate dangling reverb tank?