# Blocking Diode

**Blocking Diode** (B) prevents electrical "shorting" to secondary coil (A) during pulse-off time since the diode "**only**" conducts electrical energy <span style="text-decoration: underline;">in the direction</span> of the schematic arrow.

[![image-1703011664617.png](https://stanslegacy.com/uploads/images/gallery/2023-12/scaled-1680-/qhtqz9LzDjg4722f-image-1703011664617.png)](https://stanslegacy.com/uploads/images/gallery/2023-12/qhtqz9LzDjg4722f-image-1703011664617.png)