JamesNewman

5 ms·

1.
by JamesNewman 11y ago
A couple of reasons. Firstly its dynamic behaviour, If I'd known about the 1us gate propagation time earlier I may have tweaked the componentry a bit. The second reason is that it may have picked up some of my mistakes such as transpo
2.
by JamesNewman 11y ago
I have to confess that power efficiency wasn't/isn't top of my list. As it happens the parts you suggest don't feature on the Farnell website which is where I did my selection. I use the L-1334SRT. I can't now remem
3.
by JamesNewman 11y ago
I did do a lot of simulation of the logic. I built models of the hardware in software (C++). But I didn't do any analog simulation, which was a mistake. I was aware of SPICE and had a look around but the tools I found seemed expensive.
4.
by JamesNewman 11y ago
The cost is a rather embarrassing £20k. The biggest cost is the circuit boards about 7 or 8k now I think. The simple hardware such as the aluminium, nuts and bolts etc was a few thousand. Cables and connectors were thousands. I've had
5.
by JamesNewman 11y ago
I never really thought of using relays, just not into them. There's a chap called Harry Porter someone mentions below who has built a processor out of relays which looks very impressive. My starting point was that I was trying to learn
6.
by JamesNewman 11y ago
Not at the moment, I'll try and remember to have a look at that next time I test a module. Currently everything is shuffled into the corners so I can start the construction of the decoder frame.
7.
by JamesNewman 11y ago
I have a unicycle ! But never mastered it. Furthest I've managed was a metre or so and most of that was falling. But if I put the processor on casters it might support me as I pushed it along on the unicycle. Got to be worth a try...
8.
by JamesNewman 11y ago
I saw the Babbage machine when it was first built at the Science Museum. It is truly beautiful.
9.
by JamesNewman 11y ago
I'd be delighted if there was enough interest and a way for it to be on public display. But there's a way to go yet.
10.
by JamesNewman 11y ago
Extrapolating from the three frames so far it's looking about 48A at 5V, so 250W. Nearly all of that is for the LEDs.
11.
by JamesNewman 11y ago
I hadn't realised people would be so interested ! I'll try and answer some of the questions that have been asked. I just use a single type of MOSFET, the 2N7000. I did look at BJTs (in fact the whole thing started because I wanted