https://hykrion.com/tags/ca3306/ Recent content in CA3306 on Hykrion Hugo es-ES Wed, 09 Sep 2026 00:00:00 +0000 https://hykrion.com/post/arduino/oscaret-dso183/ Wed, 09 Sep 2026 00:00:00 +0000 https://hykrion.com/post/arduino/oscaret-dso183/ <h1 id="front-end-analógico-del-dso183">Front-end analógico del DSO183</h1> <p>Vamos a usar el front-end analógico del DSO183 puesto que es accesible directamente desde TP3/V2, tenemos el esquema y viene muy bien explicado por el autor en su <a href="https://jyetech.com/dso183-diy-kit/">documentación</a>.</p> <p>Si revisamos el <a href="https://jyetech.com/wp-content/uploads/DSO183_Schematic.pdf">esquemático</a> o la <a href="https://jyetech.com/wp-content/uploads/DSO183_HowTheCircuitsWork_en.pdf">explicación de cómo funciona el circuito</a>, vemos que el U2D realiza dos funciones:</p> <ul> <li>añade un offset de 1V</li> <li>crea una ganancia de <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo>≈</mo><mn>4</mn></mrow><annotation encoding="application/x-tex">\approx 4</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.4831em;"></span><span class="mrel">≈</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6444em;"></span><span class="mord">4</span></span></span></span></li> </ul> <p>Con lo que tenemos:</p> <span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><menclose notation="box"><mstyle scriptlevel="0" displaystyle="false"><mstyle scriptlevel="0" displaystyle="false"><mstyle scriptlevel="0" displaystyle="true"><mrow><msub><mi>V</mi><mrow><mi>T</mi><mi>P</mi><mn>3</mn></mrow></msub><mo>≈</mo><mn>3.953</mn><msub><mi>V</mi><mrow><mi>i</mi><mi>n</mi></mrow></msub><mo>+</mo><mn>1.0</mn><mi>V</mi></mrow></mstyle></mstyle></mstyle></menclose></mrow><annotation encoding="application/x-tex"> \boxed{V_{TP3}\approx3.953V_{in}+1.0V} </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.5133em;vertical-align:-0.49em;"></span><span class="mord"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:1.0233em;"><span style="top:-3.5133em;"><span class="pstrut" style="height:3.5133em;"></span><span class="boxpad"><span class="mord"><span class="mord"><span class="mord"><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:-0.2222em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathnormal mtight" style="margin-right:0.13889em;">TP</span><span class="mord mtight">3</span></span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">≈</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mord">3.953</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3117em;"><span style="top:-2.55em;margin-left:-0.2222em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathnormal mtight">in</span></span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mord">1.0</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span></span></span></span></span><span style="top:-3.0233em;"><span class="pstrut" style="height:3.5133em;"></span><span class="stretchy fbox" style="height:1.5133em;border-style:solid;border-width:0.04em;"></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.49em;"><span></span></span></span></span></span></span></span></span></span><p>Este offset está perfecto para el STM32 que trabaja a 3.3V, ya que si queremos poder manejar señales con parte negativa 1.5V sería aproximadamente la mitad del recorrido, pero nuestro CA3306 funciona de 0-5V, como Arduino UNO.</p>