CompuLab is a simple logic trainer I designed as a labour of love for one of those "ancient" pieces of electronics developed in the bronze age: the DEC H500.

The original DEC H500 is rare, very sought after and expensive nowadays, so here it is a cheap alternative for anyone.

A single Compulab module has just less then half of the logic operators of a full H500, but you can use more than one module to increase the number of operators. I placed two DC barrel for the pourpouse of parallel power supplying.

A complete list of components is in the attached BOM. Components for the clock source are a function of the clock frequencies you are interested in. I used 1uF and 10nF poly caps, a 1M ohm trimmer and a resistance of 47K ohm to achieve a minimum clock frequency of 1 pulse/s.

To keep everything compact and clean, I had to use some surface mount device (SMD). Nothing too difficult to solder with the help of some solder flux (any Rosin Flux Pen will work good), don't worry!

Please, keep in mind that there's not a circuit against power polarity invertion, nor a voltage regulator: feed Compulab with regulated 5V such those used for USB deviced and have fun!

You can get DEC H500 workbook and teachers guide at this great instructable here: https://www.instructables.com/DEC-H-500-Computer-Lab-Reproduction/