<html class="apple-mail-supports-explicit-dark-mode"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Replying to this so I can monitor responses, because I am curious. I noticed that the 2164 could operate at low supply voltage. But i interpreted the specs to mean you need at least a trickle of negative voltage to get the correct range out of this device. Maybe in this circuit where it’s not being used as a vca it’s okay?<div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Benjamin Tremblay</div><div dir="ltr"><br><blockquote type="cite">On Aug 2, 2026, at 9:35 AM, Rutger Vlek via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Dear list,<div><br></div><div>I'm working on a sawtooth oscillator for a new personal synth project and have a question about temperature compensation with the 2164, as proposed in the datasheet (Figure 11): </div><div><span style="background-color:transparent"><a href="https://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf">https://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf</a></span></div><div><br></div><div>I noticed that the proposed compensation scheme takes a bipolar CV input (-5 to +5V) and generates a temperature compensated control signal for the final exponentiator (VCA2) that is also bipolar in nature, centered around the unity-gain point (0V) of the 2164. I wondered: was this chosen for practical reasons, or does the temperature compensation (or expo conversion) work more accurately around the center-point of the 2164?</div><div><br></div><div>The reason I ask is because I'd like to adapt this scheme to work with a unipolar CV coming from a MCU. I'm also wondering if I can drop VCA3, as high frequency compensation of non-temperature dependent effects can be entirely done inside the MCU.</div><div><br></div><div>Best,</div><div><br></div><div>Rutger</div><div><br></div></div>
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