2nd PCB - Adds a dual flip-flop chip

A project log for Dual Interleaved CS42448 Chip

16 Audio In & 16 Audio Out using only 5 pins

Paul StoffregenPaul Stoffregen 12/28/2020 at 14:593 Comments

I added a 74LVC74 flip flop chip which will retime the FS2 and MUX control signals to the falling edges.

PCB sent to OSH Park, parts on order from Digikey.  Now begins another wait...


Simon Merrett wrote 12/28/2020 at 20:20 point

Thanks for logging this project Paul. I decided to make a Teensy based sequencer for my children this weekend. As in, I made the decision in a weekend (I know nothing about audio so it took me a long time to work out what I was trying to make for them). It will take me a very long time to build it. 

Looking forward to seeing how this project of yours turns out but I think I will stick to the audio shield! 

By the way, have you seen the high density memory chips recently tweeted by Greg Davill and tested by adafruit? Wondered if they're a good fit for teensy audio

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Paul Stoffregen wrote 12/28/2020 at 21:50 point

Maybe check out the Monolith Synth project.  4 of us built it in 5 weekends.  It had a 40 arcade button sequencer on the front and a lot of other synth stuff on the sides.

I saw Greg's message about those chips, and also Adafruit's.  Most SD cards are fairly high random access latency which is less than ideal for playing more than 1 sound at a time.  Will be interesting to see if those chips are any better.  But my expectation is they'll be about the same as cheap SD cards.

Lately there's been a lot of development around filesystems and storage.  All the discussion is on the forum.  We're also in beta testing on new software, again on the forum.  That's the place to go if you want to get the latest developments.

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Simon Merrett wrote 12/28/2020 at 23:30 point

Checked out the monolith - what a cool device! I will head over to the forum. 

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