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Old 19th Sep 2019, 9:43 pm   #3
Hengist
Triode
 
Join Date: Feb 2014
Location: London, UK.
Posts: 20
Default Re: Homebrew Analogue Computer

For the Lorenz project the following functions/operators are required:
Add, Subtract, Multiply by constant, Set Coefficient, Integrate and Multiply. 'Add' can be done using the Unilab 'Summing Amplifier' (module 204), 'Subtract' can be done with the Unilab 'Difference Amplifier' (module 202), 'Multiplication by constant' can be done with the Unilab 'Inverting Amplifier' (module 200), 'Set Coefficient' can be done with the Unilab '100k Potentiometer' (module 9), 'Integrate' can be done by tweaking the Unilab 'Summing Amplifier' (module 204) (tweak is to change the feedback resistor to a capacitor). 'Multiply' is missing so my approach is to use Unilab module 50 (Project Board) and plug in an AD633 multiplier chip. Here is a short video of my completed computer in action:

https://www.youtube.com/watch?v=BCBl_PxKgpQ
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Regards,
Tim
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