From fe4cd6dbdd5a576d795db3d19f6f5ffcf45e56bd Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Fri, 13 May 2022 18:41:38 -0700
Subject: Add an active probe to the test circuit

---
 test.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test.rb b/test.rb
index b0e9dd4..f63b557 100755
--- a/test.rb
+++ b/test.rb
@@ -38,6 +38,16 @@ def btn(color="black")
   pair(sw[1], sw[3])
 end
 
+def probe(attenuation=20, impedance=50)
+  jack = comp("J", "SMB", "SMB jack", "#{attenuation}x #{impedance}ohm probe")
+  jack[2] - jack[3] - jack[4] - jack[5]
+  if attenuation == 1
+    pair(jack[1], jack[2])
+  else
+    pair(r("#{(attenuation-1)*impedance}ohm") - jack[1], jack[2])
+  end
+end
+
 nl = Lace::Netlist.new do
   $vcc = net("vcc")
   $gnd = net("gnd")
@@ -50,6 +60,7 @@ nl = Lace::Netlist.new do
   x = $vcc - btn("white")
   x - net("x") - led("amber") - $gnd
   x - inverter() - net("xbar") - led("blue") - $gnd
+  x - probe - $gnd
 end
 
 nl.kicad
-- 
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