CMOS Digital IC's

The Talking Electronics website usually has some useful books, kits and circuits available to begin with:

This may result in howls of disagreement from experts. If you want to go 'free form', ie. put together a few DIP logic ICs and connect them together according to your own design, then IMO the easiest way to go is still wire wrap, at least noone has shown me a better way yet for quick prototyping.

The best sockets for DIPs by far are turned pin sockets. If you can't find these for wire wrap, then AFAIK you can still obtain 0.1" single inline headers with wire wrap on one end and a turned pin on the other. You just snip off the required lengths and insert into 0.1" spacing matrix board to make up your DIP sockets.

As far as tooling goes, all you need is a hand wire wrapper/unwrapper tool, and a couple of spools of wire wrap wire. Since you can easily unplug chips and unwrap connections, your board, sockets and ICs all become reusable. OTOH, assembly with turned pin sockets and wire wrap is actually extremely reliable, I have devices made this way that have been running for many years with no problems.

Good luck and enjoy.

You have obviously never used a solderless breadboard.

Dave.

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Motorola is now calling themselves 'Freescale'.

You can find their appnotes here:

Good luck! ;^)

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I used both and found the solderless boards easier, Rockby Electronic also had em on sale once. Also I found the machined pin sockets wore out after a few insertions and the cheaper wipe contact versions lasted longer in an EPROM programmer I built.

**This is what I purchased many years ago. It should provide a good, basic grounding in what you need to know. Included are some projects and pinouts of most popular types, along with some good theory.

As others have suggested, a solderless breadboard, a power supply and you're good to go.

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Trevor Wilson
www.rageaudio.com.au

While I think of it Jerd, CMOS IC based circuits benefit from inputs that are not being used being tied to GND with a 4.7M resistor to avoid picking up mains or other interference. Also inputs that ARE being used can benefit from such a resistor to GND.

A 0.1uF capacitor across each IC's power pins helps to bypass the supply rails and finally, if you do solder up a circuit on a PCB or a breadboard PCB, make sure you clean the flux off the board with a toothbrush and metho as the flux can pass enough leakage current between the close pins of a DIP package CMOS IC to cause problems.

I have, and for trying things out you're right, it's easier. The approach I'm suggesting is more for building something that's going to be put in a box and used.

Well, there nothing special about the original 4000 series CMOS logic ICs over

74 series 'TTL' types except fpr the supply voltage range. They all perform much the same functions. Indeed 'TTL' types are usually these days a CMOS version of the original e.g. 74HC00.

I'd recommend learning logic functions such as combinational, latched, clocked etc and learn Karnaugh maps.

Graham

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For prototyping maybe. Use them in production and chips will 'walk' out of the sockets due to thermal cycling.

Graham

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Not true. Mototola divested itself of various 'commodity' transistor and IC / CPU lines to ON Semiconductor and Freescale.

Motorola still exists, although AFAICS only makes mobile phones now.

Graham

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I think you got yourself confused there.

Graham

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to my

Ok I'll bite... which part?

I'm interested in your experience with chips walking out the sockets of machined pin types. What type of product and what type of vibration environment have you seen this happen in?

Neve DSP boards. It was thermal cycling, although vibration could likely do it as well. For manufacturing I always use the reversed V-shape contact that grips the lead like shit sticks to a blanket. They're also inexpensive.

Graham

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