Anyone have any idea how to choose a crystal for this project ?
http://little-scale.blogspot.com.au/201 … odule.html

Maybe it's in the tutorial,  and I missed it ?
Maybe it's something stupid I missed ?

I would suggest a crystal oscillator of either 1.83 MHz, 2.0 MHz, 1.0 MHz or 1.5 MHz.

I've found that 1.83 MHz ones are easy to source where I live.

The SN76489 is pretty happy with a variety of clock speeds and sources.

Nice source for the SN76489? any experiment on ebay?

haha well the last time i bought 30 sn76489's from ebay, only 10 worked...

cheap == cheap == crap

little-scale wrote:

haha well the last time i bought 30 sn76489's from ebay, only 10 worked...

cheap == cheap == crap

that is WHY I double check smile
so any good site that sell NOS or anything ?
I found one in the past but forget to bookmark...

Last edited by Aly James (May 8, 2013 2:00 am)

I've always been happy with the chips I've bought from http://www.arcadechips.com/ - I've bought quite a few sound chips, and they've always worked...

little-scale wrote:

I've always been happy with the chips I've bought from http://www.arcadechips.com/ - I've bought quite a few sound chips, and they've always worked...

checked
no SN76489 for now , but they have a bunch of nice DAC smile might be cool for some of my guitar bite crushing stuff...

ive got a handfull of the chip, but the crystal is really hard to find.
what did you source from?

RS online - they usually have them in stock smile

like this?
http://www.jameco.com/1/3/crystal-oscillator-1-mhz

I got the crystals from RS Online Uk, and sourced the SN chips from eBay... Though I may purchase some more with Little-Scales noted failure rate!
Oddly I couldn't find one supplier of Teensy boards in the UK.

liquidcalm wrote:

I got the crystals from RS Online Uk, and sourced the SN chips from eBay... Though I may purchase some more with Little-Scales noted failure rate!
Oddly I couldn't find one supplier of Teensy boards in the UK.

we could use any arduino board though, right?

does the code change if the crystal runs at 1.8 instead of 1?

Last edited by DUNGEONMASTER (May 9, 2013 8:00 am)

I think I'll rewrite the code for pitch --> frequency conversion derived from a master clock.

I'll also port it to Arduino (will be super simple).

The 1MHz crystal means a much lower pitch range, which is AWESOME

DO WANT

This 1MHz one: http://www.jameco.com/1/1/25176-osc1-1- … lator.html