Electronics > Beginners
Learning the Art of Electronics - keypad
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rstofer:
For a project where the clock can be slowed down, like Ben Eater's project, a logic probe will work well.  In fact, his demos almost always show the LEDs blinking at a human rate.  There are a lot of gating signals that will be fun to probe.

It's when you get to full-blown microcontrollers running at a large number of megahertz that logic probes become door stops.

I found a complete parts list for Ben's project with links to various suppliers including Amazon for which, if you click through his link, he gets a finder's fee.

The prototype boards he suggests run a little under $8 at Amazon.  Clearly NOT the low price spread.  OTOH, if there is a significant difference among prototype boards, I am inclined to go with the recommendation rather than have to troubleshoot poor connections.

There's a thread around here somewhere on the manufacturer who actually builds the 3M boards, considered by many to be the best of breed.  Maybe a 'Search' will turn it up.

Apparently the project takes 14 boards so call it 15 and you're looking at somewhere around $120, just for boards.  But the boards last forever.  Once this project is complete, they can be reused.

https://www.amazon.com/gp/product/B0040Z4QN8/ref=as_li_ss_tl

For me, I would put the project in an acrylic box and hang it on the wall as art.  There's nothing quite as satisfying as blinking LEDs.

I'm a huge customer of Amazon so I would probably get most of the stuff there after I checked the price with DigiKey, my favorite electronics supplier.

https://eater.net/
bd139:
CPC and Farnell here in the U.K. were selling off Wisher boards for a very low price recently. They are pretty good. As good as 3M ones.
rstofer:
There are also some solder type breadboards with exactly the same configuration as these prototype boards.  Once the project is known to be correct, move the components to the solderable boards and mount it under glass.
bd139:
You’re giving me ideas now too  :-+  :-DD
rstofer:

--- Quote from: bd139 on May 06, 2018, 09:04:17 pm ---You’re giving me ideas now too  :-+  :-DD

--- End quote ---

Ideas?  I just ordered the parts!

I have no idea why I am going to build this thing but I think the idea of wall art sent me around the bend.  Come on, how cool is that?  Talk about geekdom...

The 28C16s had to come from eBay as did the 74ls76s.  This is regrettable.  If I have a problem, I'll just design my way out of it.  I will also need to buy a couple of SOIC 24 -> 24 DIP adapters.  But I don't need them today...

7476s are available and should probably work fine but I decided to stay close to the list.  No really good reason...

I got the other ICs at Jameco but I ordered a bunch of stuff through Amazon (prototype boards, LED, switches, 7-segment displays, wire, etc).  I clicked through Ben's shopping list so he should make a little off the deal.

I don't really have a project on my table at the moment and this is as good as any.
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