8 pin 4017 chip?..I'm attempting a seek wah...

elenore19 · June 16, 2011, 01:25:43 AM

Hey all-
I'm wondering where I could find a 4017 chip with 8 pins. All the ones I've come across have had 16 (at a glance...much more than 8 though).

Any help is greatly appreciated. I'd love to get some parts ordered for this seek wah. Thanks!

-Elliot

Taylor · June 16, 2011, 01:51:33 AM

No such thing exists, and if you made one, it would only work for a 2-step sequencer anyway - not too useful.

What gave you the idea that this was needed? Can you post the project to which you're referring?

R.G. · June 16, 2011, 08:45:30 AM

Quote from: elenore19 on June 16, 2011, 01:25:43 AM
Hey all-
I'm wondering where I could find a 4017 chip with 8 pins. All the ones I've come across have had 16 (at a glance...much more than 8 though).

No problem. the 12F609 is an 8-pin microcontroller that can be programmed to do exactly the same thing.

EATyourGuitar · June 16, 2011, 09:45:32 AM

I have 10 or 20 4017's in soic that I cant use. if anyone wants them. these are the tiny smd/smt ones

Mark Hammer · June 16, 2011, 09:50:56 AM

I'm confused by the initial request. Is the desire for simply something physically smaller, or is the desire for something with fewer "steps"?

Alternatively are you really thinking in terms of a S&H kind of sound without any requirement to adjust the steps?

anchovie · June 16, 2011, 10:02:48 AM

The original request is based on a desire to clone a ZVex Seek Wah combined with the confused belief that a CD4017 which is required for the project is available in an 8-pin version.

EATyourGuitar · June 16, 2011, 05:19:57 PM

I think the 4017 is a decade counter so that means 10 step. Plus the power and other stuff so its 14 pin. I wanted dip but got soic.

ugly_guitar_guy · June 16, 2011, 05:24:22 PM

I finished my seek wah last week, and used a normal 4017. You just set the first 8 pins to the LED's and then the 9th to inhibit and start over again. You don't need one with fewer pins to make it work.

R.G. · June 16, 2011, 07:04:12 PM

Quote from: ugly_guitar_guy on June 16, 2011, 05:24:22 PM
...and then the 9th to inhibit and start over again.

Reset pin, not inhibit.

ugly_guitar_guy · June 17, 2011, 11:48:13 AM

Quote from: R.G. on June 16, 2011, 07:04:12 PM
Quote from: ugly_guitar_guy on June 16, 2011, 05:24:22 PM
...and then the 9th to inhibit and start over again.
Reset pin, not inhibit.

Correct, I forgot what the pin was labeled.

R.G. · June 17, 2011, 12:00:50 PM

Quote from: ugly_guitar_guy on June 17, 2011, 11:48:13 AM
Correct, I forgot what the pin was labeled.

I remember this one very well, because I made exactly this mistake back in my misspent youth. Only I actually hooked up the inhibit pin. Took me quite a while to puzzle out what I did wrong on that one.

elenore19 · June 19, 2011, 05:06:05 PM

Yeah, it's a clone of the zvex wah. Someone had posted a project file with the PCB files and what not, so I have a PCB that is made for an 8 pin chip...any way for me to make an easy adjustment to get it working with a 14 pin chip? or not so much?

anchovie · June 19, 2011, 05:31:33 PM

Are you ever going to post a link to this layout? I don't know how you expect your question to be answered without anyone seeing the board.

Taylor · June 19, 2011, 05:34:02 PM

Either the project file at which you're looking is mislabeled, or you're reading it wrong or something. The only 8-pin chip in that circuit will be a dual opamp, most likely.

Galego · June 20, 2011, 04:45:58 AM

I did that seek wah, i think it was done by solderman. LED switching caused horrible popping through the audio.

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8 pin 4017 chip?..I'm attempting a seek wah...