Op-Amp — Non-Inverting Amplifier

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    line { stroke:#0f172a; stroke-width:1.6; fill:none; }
    text { font: 12px Inter, sans-serif; fill:#0f172a; }
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  <!-- Op-amp triangle -->
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  <text x="190" y="70">−</text>
  <text x="190" y="140">+</text>
  <text x="230" y="105" font-weight="600">OPA</text>
  <!-- + input -->
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  <text x="40" y="145">Vin</text>
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  <!-- output -->
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  <circle cx="430" cy="100" r="3" fill="#0f172a"/>
  <text x="440" y="105">Vout</text>
  <!-- feedback Rf -->
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  <line x1="180" y1="60" x2="180" y2="40"/>
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  <text x="225" y="48">Rf</text>
  <!-- Rg to ground -->
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  <text x="155" y="14">Rg</text>
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  <text x="120" y="260">Gain = 1 + Rf/Rg</text>
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