start with basis of bath

tikz/mon48v.tex

@@ -0,0 +1,43 @@
+\documentclass[]{standalone}
+\input{./tikzpreamble}
+
+\begin{document}
+\begin{circuitikz}[scale=2]
+    \draw[color=black, thick]
+    (0,0) node[left]{$V_{SS}=-48V$}
+        to [short,o-*] (1.5,0){} % Baseline for connection to ground
+    (1,0) 
+        to [R, text width=1cm, l={R? 240k}, *-] (1,3)
+        to [R, text width=1cm, l={R? 1k}, *-] (1,6)
+        (0,6) to [short, o-] (1,6)
+
+    (2.1,3) node[fd op amp] (fdoa) {}
+    (fdoa.+) to (1,3)
+    (fdoa.-) to (1.5,0)
+    (fdoa.down) to (2.06,0)
+    (fdoa.down)+(-.2,-.1) 
+        to (1.86,2.2)
+        to (.1,2.2)
+        to [short, -*](.1,6)
+    (fdoa.up) 
+        to (2.06,6)
+        to (5,6)
+    (fdoa.up)+(-.2,.1)
+        to +(-.2,1)
+        to [short, -*] +(0,1)
+    
+    (4,3) node[op amp] (oa) {}
+    (fdoa.out -) to (oa.-)
+    (fdoa.out +) to (oa.+)
+
+    (2.06,0) to [short,-o] (6,0) node[right]{GND}
+    (5,0) node[ground]{} node[circ](4.5,0){}
+    (5,0) 
+        to [R, text width=1cm, l=$R20$ 1k] (5,3)
+        to [R, l=$R21$, *-*] (5,6)
+        to [short, -o](6,6) node[right]{$V_{DD}=3.3 V$}
+
+    % Mosfet Transistors
+    ; 
+\end{circuitikz}
+\end{document}

tikz/tikzpreamble.tex

@@ -2,4 +2,10 @@
 \usetikzlibrary{positioning, shapes, arrows}
 \usepackage[siunitx]{circuitikz}
 \usepackage[utf8]{inputenc}
-\usepackage{fontenc}
+%\usepackage{cm}
+\usepackage[T1]{fontenc}
+\renewcommand*\familydefault{\sfdefault}
+
+\usepackage{sectsty}
+\allsectionsfont{ \sffamily}
+