#10

A four-voice digital oscillator with filtering and a wide bandwidth noise source would soak up some of those cycles … :thinking:

1 Like
#11

This looks very impressive.

I remember hearing some misgivings about the licensing of the Teensy software stack - is it true it’s not fully open source?

#12

On the hardware side, I don’t think the source of the bootloader has ever been available, to discourage Teensy clones.

1 Like
#13

Godammit! I ordered a 3.6 on Monday. Same thing happened to me when they bought out the new Raspberry pi.

3 Likes
#14

This looks sooooo good. Trying to work through the ramifications of the speed increases.

#15

To me, the 3.6 is still a different beast. Has plenty of features that the 4.0 doesn’t have, use those and get a 4.0 also :slight_smile:

1 Like
#16

Sounds like a plan! (20 characters)

#17

If you want to use over 100mA for your DIY module, it better be incredible. I just want a Teensy that uses LESS power so the 8 modules I have that uses them can use even less power.

1 Like
#18

Regulating 12v down to 5v on every digital module seems a bit silly to me. I’m running a seperate 5v 5amp supply.

2 Likes
#19

I’m thinking we might be able to underclock these and get more performance for less power …

1 Like
#20

So you could even change clock rates on the fly for, like, using higher sample rates/more DSP widgets at the cost of more power or whatever. I’m not finding a lot of data sheet details on if there’s a minimum clock frequency for this part, or any, like, power vs. frequency curves for Cortex M7 voltage/frequency scaling. Cursory googling brought me to somewhere in this JavaServer Pages site at which point I decided to give up for the night.

1 Like
#21

I’ve been told modern PC motherboards mostly use the 12V line too and buck it down in several places on the board. As long as you use efficient switch-mode converters and not linear regulators it’s fine. It means you can use smaller individual converters since you’re drawing less amps from each, and it also means they’re isolated from each other. You’re not dependant on having one good, clean 5V supply for your entire case.

#22

What features does the 3.6 have that the 4 doesn’t? I know that some physical features are absent, but the 4 his direct pins for SD access, second USB port, and so on. You just have to break them out yourself. But wondering if I’ve missed something.

#23

No, you’re right, just easier to get to those physical features.

#24

I was just looking at the Expert Sleepers ES40 and realized that with the onboard S/PDIF on the Teensy 4, this could perhaps open up for some interesting hardware interfaces.

Depends on how open the ES protocol is of cause.

1 Like
#25

It looks to me like the DAC (previously on A14) has vanished. Have I missed a breakout pin?

#26

No - i believe it’s been removed. There’s a few notes here and there about (in)compatibility with the Audio Shield or other shields.

#27

The audio shield is addressed here.

Another rev is coming soon which will have the pins re-routed so it (the sudio shield, sic) works directly on top of Teensy 4.0.

https://forum.pjrc.com/threads/57167-Teensy-4-0-I2S-Support

#28

No, you’re right, and that’s a big commission. The 13-bit (or whatever it was) DAC that was often used for mono audio doesn’t exist on the Freescale chip on the 4.0. So if you want analog audio out, it’s I2S + an external DAC of your choice…

1 Like
#29

If you’re an oshpark fan, they now have purple Teensy 4s!

3 Likes