examples: R1/C1 tolerance corners + scipy.signal control cross-checkHEADmain

The RC example now sweeps R1 (+-5%) and C1 (+-10%) extremes, reads the
pole off each transient (tau = 1 - 1/e crossing, fc = 1/(2*pi*tau)),
overlays the analytic scipy.signal step response per corner, and adds
a Bode plot of H(s) = 1/(1 + sRC) with pole/cutoff comparison table.

1 files changed, 7 insertions, 3 deletions

diff --git a/README.md b/README.md
index b44856e..3a5f848 100644
--- a/README.md
+++ b/README.md
@@ -53,10 +53,14 @@ raw files.
 
 ## Example
 
-`examples/` is a small runnable demo:
+`examples/` is a small runnable demo — a 5 V step into an RC low-pass:
 
-- `rc_lp.cir` — a plain ngspice netlist: 5 V step into 1 kΩ + 100 nF
-- `rc_lp.py` — runs it with kisim and plots V(in)/V(out)
+- `rc_lp.cir` — a plain ngspice netlist (1 kΩ, 100 nF)
+- `rc_lp.py` — runs it; then sweeps R1/C1 tolerance corners of the step
+  response (`corners` + `run_cases`), reading τ and the pole (f−3dB) off each
+  transient; then cross-checks the transient results against the control
+  model H(s) = 1/(1 + sRC) with `scipy.signal` — analytic step overlay, poles
+  and a Bode plot
 
 ```sh
 micromamba run -n kicad_work python examples/rc_lp.py