4000 Series Logic Availability

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: luketeaford, lisa, Kent, Joe.

Post Reply
User avatar
cornutt
Fig juggler
Posts: 1383
Joined: Sun Jan 25, 2009 10:06 pm
Location: Rocket City USA

4000 Series Logic Availability

Post by cornutt » Tue Mar 16, 2010 7:07 pm

So I'm starting to work on schematics for a crazy idea that I have for a modular-style sequencer. And as I've been putting together the logic circuitry, I've been going through Mouser and I'm noticing that a lot of 4000-series parts seem to be not available anymore, and it's making it difficult to find what I need. For instance, there don't seem to be any octal buffers available even in surface mount, much less DIP.

I'd really like to use 4000 series logic because it's the best match for typical modular signal levels. However, now I'm wondering if it would be better to do the digital parts of the circuitry in, say, 74HC parts, and only convert to the higher levels at input and output. Is there anyone else doing anything like this?
Sequence 15 -- sequence15.blogspot.com

User avatar
chocolatyshatner
Wiggling with Experience
Posts: 393
Joined: Fri May 22, 2009 7:38 pm
Location: Brine Shrimp Paradise, Utah

Post by chocolatyshatner » Tue Mar 16, 2010 8:21 pm

www.abra-electronics.com seems to have a pretty good selection of 4000 series chips. I ordered a bunch for some CGS projects. Downside is the order must be at least $25. Shipping took about a week.

User avatar
dougt
Super Deluxe Wiggler
Posts: 1132
Joined: Thu Apr 30, 2009 3:47 am
Location: Sillycon Valley, CA

Post by dougt » Tue Mar 16, 2010 10:18 pm

Specifically which chips do you need?

User avatar
cornutt
Fig juggler
Posts: 1383
Joined: Sun Jan 25, 2009 10:06 pm
Location: Rocket City USA

Post by cornutt » Wed Mar 17, 2010 12:46 pm

dougt wrote:Specifically which chips do you need?
Still kicking design ideas around, but I'm seeing that things would be cleaner if I could find a 4-in-16-out demux, and an octal line driver.
Sequence 15 -- sequence15.blogspot.com

User avatar
meridic
Common Wiggler
Posts: 202
Joined: Tue Dec 08, 2009 12:55 am
Location: frozen depths of nowhere

Post by meridic » Wed Mar 17, 2010 1:27 pm

Use TTL, level shifting is easy to do and you can use readily available parts.

It is silly to build things based on obsolete parts when when there are perfectly viable replacement parts.

Also, In my experience the bigger chips like the 16 channel muxes tend to have crap pinouts for interfacing with octal parts unless you are doing a multilayer board.

Post Reply

Return to “Music Tech DIY”