(1) Have bought a copy of the recently published Analog Computing by Bernd Ulmann. Excellent book - I particularly like the extensive foot-noting. Essential reading!
(2) Have completed the first of the (eight) integrator boards - each of which has two integrator circuits.
(2) Have completed the first of the (eight) integrator boards - each of which has two integrator circuits.
Messy and not yet assembled into a 19 inch rack of integrators/summers.
Anyway, I've now got three integrator/summer units to play with - enough to solve a second order differential equation of the form d2y/dx2 + Ay = 0. This is the first programming example in Ulmann's book (page 126).
As I say, all a bit messy, but my implementation of Figure 8.2 of Ulmann's book looks like this:
(The top board is a power supply/control board for the integrators; the middle board is my original single integrator/summer and the lower one the latest pair of integrators/summers.) As mentioned, all the integrators boards etc will end up in their own 19 inch 4U rack - I just wanted to test things out!
The boards are bussed up to the main control unit (which is pretty much completed) via a 25 way D connector, via at the moment, a 25 way break out board.
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