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| Home Brew Analog Computer System |
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| GK:
$55 for a pack of 10 for those shorting bars is a little steep! Element 14 put really ridiculous prices on many things that sell in low volumes. |
| notsob:
Try x-on in perth http://www.x-on.com.au their price for pomona 4115's is a little cheaper [ stil f&*^$ing expensive for a bit of plated metal ] |
| GK:
My very first character, synthesised entirely in analog and discrete logic hardware. Now it's just a matter of constructing the multiplexing and screen RAM addressing/reading logic and finishing the tedious job of the Fourier coefficient character ROM. Then I'll have a 16 character per line by 8 line video text display. |
| c4757p:
That is some real commitment to this whole "analog" thing. :-+ I'm pretty sure I'd have just done a raster readout. You've executed it very nicely. That looks easily as good as the "perfect" SPICE plots. And mildly off topic, but the traces all lined up nicely on the beautiful blue screen of your 551 is a work of art by itself. Damn - the more you make me drool, the more I'm going to want to play around with this myself, and then I won't get anything done! :) |
| Odysseus:
It's possible to blank a trace in LTSpice by forcing a trace to become "invalid", i.e. by computing the logarithm or square root of a negative value. However, this only works by doing the math in the waveform viewer, not in an arbitrary source. An easy way to do this is to generate a blanking signal with a high value of 10V and a low value of -1V (or -anything). Then in the waveform viewer, multiply your signal of interest by log10(V(blank)). |
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