CMOS chip PCB template

Rykhaard · Joined: Sep 02, 2007 Posts: 1290 Location: Canada

I don't know if this PCB would be of use to anyone else. I thought of it last night whilst trying to get to sleep, thinking that it might be a handier way for making a PCB for single CMOS chip PCBs.

I've included in it, descriptions of the Input and Output pads for the 100k and 1k resistors as well as the input protection diodes.

The 100k resistor depending on the pin function, can be jumpered to either the +V or Ground trace as required.

The PCB that I posted is in my "poor man's surface mount" format. Each of the pads may be drilled as required.

If anyone wants the original Express PCB file, just let me know through a PM and I can email it to you. Smile

I'm going to try this template out for myself. If it works as well as I expect it should, then I'll continue to use it, for each single CMOS IC module.

RF · Posted: Wed Mar 04, 2009 9:29 am Post subject:

Nice job, Rych!
That will be very nice!

bruce

stolenfat · Posted: Wed Mar 04, 2009 12:30 pm Post subject:

groovy stuff, i just have no clue how to make pcbs.
I started my protolunetta last night and was going to do all my circuits on cardboard. Just sticking the leads through folding them and then soldering, but then i ran into a problem of the chip leads not being long enough to poke through the cardboard. I could switch to a thinner hardy piece of paper like a cereal box, but i think i'mma stickin with protoboard.

So i guess, do you have a simple way, for some one who has no chemicals, to fry up a simple pcb?

Rykhaard · Joined: Sep 02, 2007 Posts: 1290 Location: Canada

Thanks muchlee Bruce! Shall see how it works within the next couple of days. The first chip that I'll try it for, is the 4094 - 8 bit shift register. I'll go with the Eagle schematic that you sent me in e-mail. (Thankee for the collection of them! I'll definitely be adding back TO it! Smile

)

Stolen ...... cardboard? Noooooooooooooooo! Shocked

A lot of paper can CAUSE static. A lot of today's CMOS chips have built in protection, but still - don't introduce any possibilities with the cardboard idea. Surprised

Chemicals can be a risky thing - the Ferric Chloride that I use, I got a spot of it on a finger the other day that I didn't clean off right away. It started to sting, within 5 minutes max. I rubbed it off immediately. There're 5 acids in that chemical, for eating through copper. It eats through flesh as well.

BUT ...... if you're very careful with it in a plastic or glass tub, you can make your own PCBs, with a Sanford permanent black marker. Smile

Or, with a little bit of practice, with Press N Peel.

I haven't ever offered any of mine to others, as I do all of my PCBs for soldering the parts directly on TO the pads, with no drilling at all. I don't know of a single other person that does it that way. Sad

Possibly then the best / easiest solution, is to go back to the perfboard type that you were using.

theMinister · Joined: Jun 09, 2007 Posts: 14 Location: North America

RF · Posted: Thu Mar 05, 2009 6:22 am Post subject:

A Sharpie is perfect. Get the lines good and dark...

good luck

bruce

Rykhaard · Joined: Sep 02, 2007 Posts: 1290 Location: Canada

stolenfat · Posted: Sat Mar 07, 2009 10:07 pm Post subject:

Tasmanian Alkaloid · Joined: Jun 29, 2008 Posts: 116 Location: Isle De Mort

I've seen a few people use cardboard and paper- eg. early 4ms Pedal DIY circuits.
There's also a guy who recently built a looping circuit in a cardboard box with the traces drawn directly onto the cardboard with a conductive paint pen, and components soldered straight on.
Paper circuits might even introduce some welcome noise & chatter!