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Update 'Future Modules'

gdorn 2022-09-01 00:08:33 +00:00
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Future-Modules.md

@ -24,6 +24,11 @@ Pretty confident we do these in this order next.
# More distant future # 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. 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.
## LFO
Lots of options for this one, but many people have at least two LFOs anyway.
## Sample & Hold ## Sample & Hold
#### MK's S&H, though maybe move the noise generator to a separate module? If possible? #### MK's S&H, though maybe move the noise generator to a separate module? If possible?
* full unit is ~$8.50 - $10 in parts, mostly down to PCB for holding three chips (two 74s, one 72) * full unit is ~$8.50 - $10 in parts, mostly down to PCB for holding three chips (two 74s, one 72)
@ -49,3 +54,13 @@ Less confident about the order or selection of these, though we do know we need
* third iteration of a simple manual EG * third iteration of a simple manual EG
* ~$7 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. * ~$7 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf.
## Moar VCOs
Tons of these, too, and most people want at least two of these in a rack, if not a half dozen.
#### Reverse Avalanche VCO
* See http://www.kerrywong.com/2014/03/19/bjt-in-reverse-avalanche-mode/ for the principle
* https://www.lookmumnocomputer.com/simplest-oscillator/ for a drone / manual version,
* https://kassu2000.blogspot.com/2018/07/avalance-vco.html for a VC version.
** not a very large range of in-tune response, but comments discuss potential fixes, maybe worth it for practice
** about $3 in parts (no ICs), and a big part of that is PCB and IDC, so expanding to a dual or quad would add very little cost
** cheap way to get to a slightly-detuned supersaw, with a voltage splitter or multiplexer module