Thursday 3 January 2019

Ciat Lonbarde _ Gerassic Organ

My first build for 2019.
The Ciat Lonbarde Gerassic Organ.


This is what is called a "Paper Circuit".
iTS  a Dual Organ.
Here are some links for paper circuits.
http://ciat-lonbarde.net/paper/

More Links:
http://www.ciat-lonbarde.net/TIMARACURRICULUM/TIMARATERIALS/cirques/index.html


Totally DIY . I'm trying to avoid using any "traditional" PCB materials.
Art meets Electronics


The PCB design is a beautiful, organic creature. Totally divorced from the grid like PCBs I'm used to.
The plan is to use transparent perspex to hold everything together.
You could easily build this on some perf board but you wouldn't be able to see the connections.

The 4067b is a digitally controlled analog switch.
It's a 16 channel CMOS analog multiplexer.


There are 4 binary control inputs (A,B,C,D) and a inhibit input, arranged so that any combination of the inputs selects one switch.



PNP's = BC557 (x3) ... identified by the "+"
NPN's = BC547 (x1)... identified by the "-"
Diodes = 1N4001 (x3)
Pots = B100K (x16)   .... mouser- part number 531-pt6kv-100k
Momentary switches (x3)

Pluck length Attack resistor X = 47K to 470K
Might use a rotary switch (1P6T)
47K,100K, 150K, 200K, 300K,  470K  ???
or a A500K pot


Hairy Capacitor * = 0.001uF to 10uF ??
0.001uF code 102 ....high treble?
0.01uF code 103 ....treble
0.1uf code 1004 ... bass
1uf ...sub-bass
10uF ... sub-sub bass
The hairy capacitor is for tuning.... might use a rotary switch to pick the capacitor value.
 1P6T rotary switch ???
Add an  additional variable tuning capacitor in parallel.?



 Final Capacitance = C1+C2+C3....+C10 etc etc



Waiting for parts.......To be continued....

Links
+ CMOS


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