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\begin{tikzpicture}[scale=1, every node/.style={transform shape}]
% piezo
\draw (0,0) node[rground] {}
to[piezoelectric, l=$X$] (0,2) to (2,2)
to[R, l=$R_x$, *-] (2,0) node[rground] {};
% diodes
\draw (2,2) to[R,l=$R$, -*] (5,2);
\draw (5,0) node[rground] {}
to[sDo, l_=$D_2$] (5,2)
to[sDo, l_=$D_1$] (5,4)
node[vcc] {$V_{cc}$};
\draw (5,2) to[short, -o] (6,2)
node[right] {$V_o$};
% opamp
\iffalse
\draw (9,2.5) node[op amp] (comp) {};
\draw (comp.-) to ++(0, 0.5) node[vcc] {$V_{ref}$};
\draw (comp.+) to[R, l=$R_A$] ($(comp.+) + (-2.5, 0)$) -| (5,2);
\draw (comp.+) |- (8,0) to[R, l=$R_F$] ++(2,0) -| (comp.out)
to[short, -o] ++(1,0) node[right] {$V_o$};
\fi
\end{tikzpicture}
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