The parts list specifies 6 CAT28C16AP EEPROMs are neded for the Output and "Control Unit" modules. I've watched the Output videos and after the most recent one it looks like that requires only one EEPROM with Bens multiplexing approach. That would leave the remaining 5 EEPROMs for the Control Unit section. For that however I cannot find any videos.

The EEPROMs I found are all quite expensive (5-10€ each), so I'd like to keep the amount I buy at a minimum. Can you link me to the video that requires all these EEPROMs so I can see if they're really required or if there's perhaps any alternatives?

Thanks!

What / where can one find the DIP style memory packages that lend themselves to breadboards?
74LS200 or other of the 74 series ram chips would be fine - I just cannot seem to locate parts.

The Datasheet for the 74LS173 (4-bit D-type register) can no longer be found at TIs site, at least not at the current URL.
However, there is a datasheet that seems correct at this URL: http://www.ti.com/lit/ds/symlink/sn74ls173a.pdf

Hi Guys,

I am kinda new to this - but just spent a few hours with my son doing the clock circuit breadboard.
We only had the 74LS00 and 74LS04, so we had to design our own logic circuit. I mocked it up and PDF'd it, and would love to add to the git here.

I forked it over to my git account, and did so - but have no idea how to provide that information over to you?

Kevin

There appears to be an issue with the alternative astable (by @loneregister) as laid out in the PDF which would be a big gotcha for new players...

Pin 7 from the 555 should be connected to Vcc via the charge resistor (r1 in most astable diagrams but R2 in this diagram). This schematic clearly shows R2 connecting to Ground though R2 and thus the astable should never start in this config:

Ben's setup clearly shows the charge resistor connected between Pin 7 and Vcc:

This image also shows R4 between pins 6 & 7 which goes on to become the variable resistor. Can this please be updated?

In the control module parts list (and the output module parts list, I believe), you've got a 74LS139 (Dual 2-to-4 line decoder) listed, however, Ben uses 74LS138s (3-to-8 line decoder).