diff --git a/docs/projects/02learn.md b/docs/projects/02learn.md
index 83a641b74b4ea17e9a2bdaec05c6186e8fb385cc..ccfa98009bafc3354f978443ce755bae0001003e 100644
--- a/docs/projects/02learn.md
+++ b/docs/projects/02learn.md
@@ -61,27 +61,44 @@ Some people prefer the term 'wearable electronics' instead of e-textiles - both
 
 # Oscillator Modules
 
+## What's an oscillator?
+Every synthesizer needs an oscillator. An oscillator is a circuit that takes a steady signal (e.g. from a battery) and turns it into an oscilllating (changing / moving up and down) signal.
 
+[diagram]
 
+## Wendy: the NOT gate
+The heart of the Wendy is a CD40106 IC, which is a logic chip containing 6 inverters / NOT gates. 
 
-* Wendy: The NOT gate
-Every synthesizer needs an oscillator. An oscillator is a circuit that takes a steady signal (e.g. from a 9V battery) and turns it into an oscillating (changing / moving up and down) signal. The heart of the Wendy is a CD40106 IC, which is a logic chip containing 6 inverters / NOT gates
+[diagram]
 
-(show diagram of how NOT gate works as an oscillator)
+mixing
 
-* Delia: The phase-locked loop
+## Delia: the phase-locked loop
+The Delia oscillator is a little more complex. Link to Hackaday?
 
 
-# Other modules
+## Ada
 
-* Maryam: space-filling curves
 
-* Filter
+## Maryam
 
-* Volume
+The Maryam module works with the Wendy module
+*When not touched, no current flowing through oscillator, no sound
+* When touched, intensity of touch determines pitch
 
-* Ada
+The design of the Maryam module is a Hilbert curve. Read more in my project diary (link) about this
 
-* Daphne
+## Daphne
+Shortening the path = raising the tone
 
-* Anni: voltage dividers
+## Anni
+Why pressing on joins creates tones
+Voltage divider
+
+
+## Volume
+Voltage divider
+
+## Amp
+
+## Hedy