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| Home Brew Analog Computer System |
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| GK:
Some progress photos. I recently burnt a big hole in my wallet buying bulk quantities of most of the semiconductors (thousands) needed for this computer project. I've got the triangle generator and a sin/cos module 90% loaded. I still need some more miscellaneous bits and pieces to finish them, but the next bulk order isn't going to happen until my funds recover. However there is still plenty of design work to do. I've actually got most of the electrical design worked out now on paper; its just a matter of drafting all of the schematics in Protel and laying out the PCBs. Attached are pics of the sine/cosine module and the triangle waveform generator, as well as a PCB layout of the power supply board (which I have just completed). The triangle waveform generator along with nine of the sine/cosine module PCB's, the power supply module and power transformers (1x 18v-0-18V sec. plus 1x 110V-0-110V sec.) will be mounted into a custom 3U 19" rack case to complete the "Sine/Cosine Chassis". The PSU board is self-contained with the exception of the series pass transistors which will mount onto the rear panel of the case on a large heatsink. This completed chassis will only be a very small part of the complete computer which will completely occupy a ~2 meter tall, floor-standing 19" equipment rack (which I already have). I'm starting on Protel files for the "LOG/EXP Chassis" now, which will contain five 100V logarithmic amplifiers and five 100V exponential (the inverse of a logarithm) amplifiers. The transfer function of these modules are based on matched transistor Vbe's (MATXX-series) with thermistor temperature compensation, rather than the piecewise approximation method as used in the sine/cosine module. In a LOG/EXP application this method has a much greater dynamic range. |
| ftransform:
can a ti-89 out perform your computer? |
| GK:
Can a TI-89 do any of this kind of stuff? http://www.analogmuseum.org/english/examples/ ..... or be patched into a prototype design to simulate/emulate simple through to highly complex control systems? |
| ftransform:
--- Quote from: GK on January 05, 2013, 03:51:21 pm ---Can a TI-89 do any of this kind of stuff? http://www.analogmuseum.org/english/examples/ ..... or be patched into a prototype design to simulate/emulate simple through to highly complex control systems? --- End quote --- Well I guess what I'm asking is how powerful of a modern computer do you need in order to equal the performance of your device? Could it do something that a desktop PC can't? I like your project I am just curious. |
| GK:
I think a modern desktop PC would have a many orders of magnitude greater computational power. Dunno how best to make a comparison to a digital computer; they are very much different things. |
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