From 249a2f30d2aa2f925591306b618c9c4b46a97442 Mon Sep 17 00:00:00 2001
From: Alvie Rahman <alvierahman90@gmail.com>
Date: Sun, 9 Apr 2023 14:42:53 +0100
Subject: [PATCH] typo in piezoelectrics notes

---
 uni/mmme/2051_electromechanical_devices/piezoelectrics.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/uni/mmme/2051_electromechanical_devices/piezoelectrics.md b/uni/mmme/2051_electromechanical_devices/piezoelectrics.md
index aa79a6e..aca7421 100755
--- a/uni/mmme/2051_electromechanical_devices/piezoelectrics.md
+++ b/uni/mmme/2051_electromechanical_devices/piezoelectrics.md
@@ -34,8 +34,8 @@ This is done using the following amplifier:
 ![](./images/vimscrot-2023-03-16T11:22:04,554599428+00:00.png)
 
 \begin{align*}
-V_\text{out} &= A_{OL}(V^+-V__) = -A_{OL}V__ \\
-V__ &= V_\text{out} - V_C
+V_\text{out} &= A_{OL}(V^+-V_{-}) = -A_{OL}V_{-} \\
+V_{-} &= V_\text{out} - V_C
 \end{align*}
 
 As input resistance of op amp is infinite: