TEENSY-Synth EXTRA: Do we need the Audio Board?

In this series we are learning how to build an awesome DIY Synth with a Teensy 3.2 Microcontroller!

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This video was sponsored by Skillshare

[HansBaier]

The ringing on the edges of the 'real' DAC is due to the bandlimiting a high quality DAC provides. It is a feature, not a bug. It prevents aliasing.

[gregorybaxter]

I'm super excited for these. I just started the teensy synth project. I'm hoping to create some instruments for/with my students in rural Maine. Love this channel, keep up the magic!

[faramoftae]

Great update on a super project. Good to see you again

[viniciusfernandes]

Great Video Man, really enlightening !

[demagmusic]

I have wired up the older version of your Teensy Synth on the breadboard and thought it was really fun. I haven't (luckily) committed it to a final hardware piece yet, tho. So glad this video came out! Maybe I'll have to commit to a finished project now LOL

[jjqformerlyjailbreak]

Where has the teensy been all my life? It will probably take me till next summer to get one. Once I do, I’m coming back here.
See you then.
Great Stuff.
God Bless.

[System-]

It's actually very cool that you still have your vintage breadboard. Especially since Radio Shack has bitten the dust.

[tenlittleindians]

I also still have my Radio Shack bread board but mine still has the power supply connector posts in the 3 holes!

[Tronic]

The vintage Radio Shack breadboard is Awesome! Very Cool 👍.

[saxhorn]

What would be super useful is a Teensy 3.2 “generic” Eurorack module that can be configured by s/w. I know some commercial modules are done this way, but use less diy accessible processors.

[carlopelusomusic]

you are a great teacher Dave, really thank you for all!!!

[jrgrust]

Thanks for this really interesting video.
I can't wait to see the new synth in action without an audio board. Maybe with a Teensy 4.1?

[pauls]

Hi Dave, very interesting video! Useful as a step by step guide! What would have been great to hear an example of a range not sounds of different pitches and timbre's. Or playback of samples, both melodic and percussive (bass drum, cymbals) to A/B sounds our ears are used to distinguishing quality from. A low bit rate mp3 of a crash cymbal sounds terrible vs a mp3 at higher bit rate. It might be more obvious if there is a difference, and how much difference, at different frequencies and types of sound. This leaves me still wondering if there is a reason to cough up the extra cash for the audio board. But I really appreciate the way to covered the process of wiring and coding the two versions. That was really great. Thanks!

[alessandro_fasan]

I think there is a filter in the audio board. You did not filter the output of the DAC, which is why you see those high-freq components. Anyway, this is a good video - thanks!

[youtubeaccount]

The last week I try to answer this question and your video comes now. Thanks!

Edit: The difference caused by the opamp and the passes (frequency filter) on the audioshield, which make the sound "round" for our ear. The 12 bit ADC hasn't any of these luxery electronics and it ihas more accuracy on the oscilloscope.

[TheOleHermit]

FYI, I've learned that the DAC output pins on the T3.6 are not AC coupled and have ~ 1 VDC offset voltage. If the LFO offsets are used to compensate, then the signal starts clipping @ 0 VDC, instead of having a +/- 3 Volts P-P range. IOW, they only output 0 to +3 VDC signals.

[JA-gtcr]

Can the Teensy generate a stable midi clock? If so, can you give some hints as to what it would take to make a midi clock with audible click/metronome sound that can be used with headphones?

[steveclark]

The Teensy audio board has a 2.2 uF series capacitor on the line out signals whereas you used a 10 uF series capacitor on the DAC output of the bare Teensy. I wonder whether the two output signals would look more similar if you used a 2.2 uF series capacitor on the DAC output of the bare Teensy.

[milansertic]

Hi! Great stuff.. Can you add some polyphonic to it?

[electron]

Nice Teensy audio demo. Keen to build the Teensy synth with Teensy 4.0, have you worked with that newer version?