http://youtu.be/ogplYeEYzu8

just need to make a dedicated 100V PSU... ]]>

Wired up the TR-10 to produce sine and cosine by solving

dx/dt = y

dy/dt = -x

which have the solutions "sine(t)" and cosine(t)". These can be plotted against time to produce a sine wave, or against each other in x/y mode to produce a circle...

Attachment 22528Attachment 22529Attachment 22530

A sort video can be seen here:-

https://www.youtube.com/watch?v=aLBSBqaVcxc ]]>

Attachment 22499

OK Uploaded video to YouTube

https://www.youtube.com/watch?v=z07eV_QIhyY

So you can watch... ]]>

However on mine the lower area had a custom panel, and the upper area where the sockets to connect them should be had a blanking plate. Have four calibrated potentiometers would be use full for demos, so I decided I needed to add some to mine.

Searching E-Bay I found some one in China selling them. These have now been delivered and are in place. I now have four small 10-turn POTS with calibrated dials.

Attachment 22333

I have wired two to the the plain white panel with wires in here..

Attachment 22334

Set the computer up so that the meter displays the sum of the two pots, but inverted...

... so if we set the pots to "2" and "3" we get "5", ... well -5 as the summer inverts....

Attachment 22335

I now need to wire up the remaining two pots.... ]]>

Well my PDP-8 on a card has arrived and is working. Pictures are on Google+ here:-

https://plus.google.com/photos/10961...CP3Y14XGoPaifQ

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Attachment 19564 ]]>