Review on Big CMOS Logic 4000 4500 IC Series Assortment Box 46 Types, 120 Pcs, CD4001 CD4011 CD4017 CD4022 CD4027 CD4047 CD4049UBE CD4060 CD4071 CD4081 CD4503 CD4543 CD4553 Etc by Brian West

These are mostly logic gates which can do interesting things without the need of a controller and useful to automate basic tasks which you don't necessarily want a controller handling. In most cases logic chips have been obsoleted by micro controllers and is typically easier to write a couple lines of code, or use a standalone transistor to switch or invert a signal, than to wire a complex circuit to utilize these various chips. However, these can be useful on the odd occasion when your controller board is running low on I/O pins. The shift register, for instance, is great for expanding 3 controller pins into 8, 16 or more. This can be extraordinarily helpful if using a pin scarce board like the ESP-01.I mostly purchased these for tinkering, educational pursuits, and to build up stock of various components which may someday fit into a project.I probably paid a little more than neccessary for this kit but the packaging was a big selling point. I appreciate the case which is well built and clearly labled with pinouts for every chip which makes sorting and prototyping much easier.