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Home Brew Analog Computer System
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Alex Eisenhut:
If you could build a Scanimate, that would be awesome.
GK:
An integrator chassis slowly coming together. The banana jack functions are as follows:

White: initial condition (I.C.) input
Yellow: x1 input
Blue: x10 input
Red: signal output
Green: earth

The orange LED below each bank of integrator outputs is for individual overload/over-range indication. Each overload indicator output also feeds an internal alarm bus. 

The brown and orange jack pair are for external logic control signals. The integrators will be ordinarily under the control of the computers timing/control unit, but a selector switch in the front panel will alternately route the control signals from these two banana jacks. There are 3 modes of operation: 1) Initial condition - the integrator is preset to the (inverted) DC potential applied to the I.C. input. 2) Compute/Run - the voltages applied to the summed x1 and x10 inputs are integrated. 3) Hold - operation is paused/halted and the integrators hold their value.

There will be three other selector switches on the front panel. One will be "Pot(entiometer) Set On/Off", which is used when setting up a "program" to assist the setting of the computers coefficient potentiometers. Another switch will be the time constant select, activating the timing capacitance reed relays of all integrators in parallel to select either the 10nF integration capacitance or the 1uF integration capacitance. The last switch will be a 10 position rotary switch used to select which one of the integrator signal outputs to route to the chassis' metering bus. By means of a selector which matrix, every single "computing module" signal output will be selectable for voltage measurement on the computers built-in 5-digit voltmeter (there will be a separate chassis associated with the timing/control chassis called the "metering chassis").





GK:
Getting closer........

netdudeuk:
Looks amazing.  It wouldn't even matter if it didn't work  :)
peter.mcnair:
Excellent!

From one analog computer builder to another:

Beyond Rössler...

dx/dt = - ax - cos(by),

dy/dt = -ay - cos(bz)

dz/dt = -az - cos(bx) .

I just finished my computer yesterday - well almost - still needs a back panel - and maybe a fan (or two...).

Given that I can now do trigonometric functions, I tried patching up the above equations...it's awesome - the results looks like soldering iron fumes!

(details in http://analog-ontology.blogspot.co.uk/2015/02/beyond-rossler.html)


Above equations from:

Experimental Study of the Sampled Labyrinth Chaos. Tomáš Götthans, Ji?í Petržela, Radioengineering, Vol. 20, No. 4, December 2011.
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