New Teensy 4.1 DIY Synthesizer

I actually wanted to go for a bike ride. But I hate the rain ;) So I asked my new friend Fred (Google AI) if he could quickly draw a notch filter curve for Jeannie 😉

20260705_151541.jpg


This is how it all sounds... The VCF envelope controls the notch.
MP3 file is to long. This is a link to my MP3 https://www.sequencer.de/synthesize...honic-synthesizer-sampler.178440/post-3108215
 
Rolfdegen said:
Hi there 🖐️
There was a minor issue with the PCM5102A DAC being used—the same one found in the Jeannie_1. When a sound decayed during the "Note Off" phase, a faint click could be heard at the very end (see the first image). The root cause lies in the automatic muting function built into the DAC chip. If the PCM5102A receives nothing but zero data at its digital input, it activates an analog mute after a few milliseconds. This results in a faint clicking sound at its output. I was able to resolve this issue via software by mixing in a small DC offset within the digital output mixer. As a result, the DAC continuously receives data and does not trigger its mute function.

Image 1: Clicking sound at the end of the release phase
View attachment 39399

Image 2: DC offset of (-1.0f/32786.0f) in the output mixer
View attachment 39400

Principle of the Digital Output Mixer with DC Offset
View attachment 39401
Click to expand...
Thanks for that, Rolf. You fixed my problem!
 
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