Thanks.

#### MrChips

Joined Oct 2, 2009
24,232
I would not go this route, but then my needs and experience could be different from yours. There are just too many components to choose: gates, flip-flops, counters, monostables, decoders etc.

I would begin by choosing a project first and just getting the ones you need.
If you are going to build circuits with discrete logic then I would get:

(5) 2-INPUT AND
(5) 2-INPUT NAND
(5) 2-INPUT OR
(5) 2-INPUT NOR
(5) HEX INVERTERS

(If you need part numbers I can look them up for you.)

Then just get the rest as required. Buy at least 1 extra for spares.
If you plan on doing much experimentation, then 5 to 10 pieces as spares is good enough for me (depending on price). This way you don't have to wait for parts to come in when you do need them.

Make sure you keep the ICs stored in the anti-static bags that the parts came in. If you live where the humidity can be high (which is just about everywhere), keep all the bags in a tight plastic bag or container with the little bags of silica gel in with the parts.

PS: With the advent of low cost, low pin count MCUs, the need for digital logic chips has been reduced substantially. I would highly recommend learning to program MCUs if you have not yet done so.

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#### Wendy

Joined Mar 24, 2008
22,547
Generally I buy them as I need them, there are too many flavors. A few stand out though, the 4017, 4026, 4013, etc.

The main thing to have is a good reference to find what you are looking for.

I use this one a lot...

http://users.otenet.gr/~athsam/database.htm

#### Yako

Joined Nov 24, 2011
245

#### atferrari

Joined Jan 6, 2004
4,433
tracecom,
I just took the shotgun approach when I ordered parts for a project and bought just about one of every CMOS IC the supplier listed on their website, more for those I knew I'd using.
When I finally I had the money for that, I did more or less the same. At that time I was buying on the counter. Later Internet came and things were different.

Make sure you have all the basic gates and combinations. Also make sure you order the CD4094 (serial to parallel converter). I found myself using it many many times. And the 4015 (right now in a just finished design, waiting for its PCB).

The good thing with that family is that your supply (Vdd) can range from 5 to 15 V. Not bad eh?

The idea of replacing some of these chips with a small micro is older than many are aware of. (Look in the very first application notes of Microchip).

Not even worth discussing about them. Have to see yet an application like that.

In fact, what you do, many times, is replacing that functionality by a small piece of code somewhere in your program to provide what the gate could have offered.

#### tracecom

Joined Apr 16, 2010
3,944
Thanks to all who provided input on this. I had no idea how many different 4000 series IC's there were. (Now, I have found there are about 150 different parts.)

I have made a list of everything recommended here and I have ordered a (used) book of 50 CMOS IC projects. When I get that book, I will finish my order list, and between the two sources (AAC and the book) should have a good starter collection.

#### Yako

Joined Nov 24, 2011
245
The idea of replacing some of these chips with a small micro is older than many are aware of. (Look in the very first application notes of Microchip).

Not even worth discussing about them. Have to see yet an application like that.
You would never get even near on-par speed. This is the problem. Like, with a PIC μC running at 1MIPS, one direct port write takes up 1μS of time to execute.

We would be making counters that should be capable of being run at 40MHz run at 40KHz.