Electronics > Projects, Designs, and Technical Stuff

Home Brew Analog Computer System

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GK:
Since this is unarguably the most interesting thread started in the history of EEVblog forum, I probably shouldn't let it die.

I got the power supply design for the sine/cosine function chassis completed/operational/tested this afternoon. This is the supply board that provides precision regulated rails of +/-110V and +/-51V, as well as the required +/-15V low-voltage supply rails, for nine sine/cosine function module boards and the single 100V triangle waveform generator. The circuit diagram *.pdf is attached. The 4 transistors mounted on the large heatsink are the series pass devices for the HV rail regulators.

The regulator was specifically designed not to have any overshoot or other funny business on power-up and power-down and also features an over-voltage detector / fault latch to shut down in the event of a loss of regulation to any of the HV rails. A scope photo is attached showing the lack of overshoot on power up.

The PSU is shown powering the triangle wave generator. The unfinished sine/cosine module board is also in the picture; I'm still waiting for an back order of 0.1% resistors to arrive, which are the only parts still needed to finish populating the PCB. They should arrive next week. Once the sine/cosine module design is tested I'll be producing another 8 of them. That will complete the electronics for the computers "Sine/Cosine Function" chassis.



 


robrenz:
Very nice stuff GK.  :-+ I had not followed this thread. Now I see why you are not jumping on the differential amplier project.....yet  ;D

veryevil:
This is just some beautiful work. I cannot wait to see more.

GK:
Thanks  :)

I'm looking foward to being able to make a start at running some elementary programs, but there is still a lot of PCB layouts and soldering to do until then. I'm working on the various PCB layouts for the computers master controller unit now (very much analogous in operation to an old school CRO timebase). That will be a major step in the right direction.

BTW, does anyone know an affordable source of PCB tin plate power? For the integrator banks (the brain of an analog computer) guarded jfet input currents need to be minimised to prevent drift in the "hold" mode of operation. Therefore I don't want to conformable coat tp preserve the copper and need to board wash after soldering.

FenderBender:
GK I really like this analog computer stuff. Is your knowlege of analog computing just accumulated from years of experience? Do you have any resources on them? I'd really like to learn about them. Shall I start on analogmuseum.org?

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