u/vigorr_rb73

My progress on the clock so far with some mods. I have been following along on Patreon. I used 74LS248's (drop in replacement) for the BCD to 7 segment drivers to get the 6 & 9 "tails" instead of the 4511's, a switching regulator instead of the LM7805 for efficiency, and I chose to blink the colons at 500mHz (1/2 second intervals). I used all my own in stock components. The hours are just "hard wired" to 12 for now. Waiting for the next 2 videos to implement the 12 or 24 hour counter. I built my own previous version with 100% 4000 series logic but thought I'd jump on this project for some added fun. Enjoy your kits and builds. Oh I also added current limiting resistor to each segment anode. It just "felt" right.

Hi all, I don't usually post on reddit or anywhere but awhile ago I saw someone post gerber files for a 4 layer PCB of the 8-bit SAP computer. Sorry I cannot remember who it was and I cannot find the original post. Also this is a brand new reddit account. My other one got hacked and I decided to shut it down and start a new one. Anyway I had JCLPCB make 5 of the PCB's, I am going to keep 2 and am willing to sell the other 3 at my cost plus actual shipping from FL. I would prefer US only addresses to minimize the shipping hassles. The board has black solder mask. I have not built it yet (I do have my breadboard version working) but I assume it is accurate to the schematics but that is unknown at this time. LMK if anyone is interested. I can send pics of the board if necessary. Thanks.

Digital Clock

Ben Eater 8 bit PCB