docs(tt_um_morningjava_r2r_from_matt): update info.md

projects/tt_um_morningjava_r2r_from_matt/docs/info.md

@@ -1,11 +1,13 @@
 ## How it works
 
-A cascade of NMOS and capacitors perfomr a delay line.
+Please refer to Matt Venn's R2R DAC description, as this is a clone of that project.
 
 ## How to test
 
-A two-phase non-overlapping clock is applied to DIN_0 and DIN_1.
+Set the `external data` input high to provide the DAC with external data.
+
+Then drive the 8 inputs and observe the analog output.
 
 ## External hardware
-A 1Vpp audio signal is applied to UA_0.
-A summing amplifier is connected to analog outputs UA_1 and UA_2.
+
+A multimeter to measure the output voltage on analog pin 0.