add exercise sheets

uni/mmme/2051_electromechanical_devices/digital_electronics.md

@@ -90,10 +90,10 @@ Clock | J | K | $Q_\text{next}$ | $\bar Q_\text{next}$
 ----- | --- | --- | --- | ---
 0 $\rightarrow$ 1 | 0 | 0 | $Q$ | $\bar Q$
 0 $\rightarrow$ 1 | 0 | 1 | 0 | 1
-0 $\rightarrow$ 1 | 1 | 0 | 0 | 0
+0 $\rightarrow$ 1 | 1 | 0 | 1 | 0
 0 $\rightarrow$ 1 | 1 | 1 | $\bar Q$ | $Q$
 
-![](./images/vimscrot-2023-03-02T12:00:50,868501744+00:00.png)
+![A shift register composed of 4 flip flops. $O_4$ is the most significant bit and $O_1$ the least.](./images/vimscrot-2023-03-02T12:00:50,868501744+00:00.png)
 
 ## Serial to Parallel Conversion with JK Flip-Flops