Now the battery charger is set and ready to go. Read a commentary on this article by Anoop Hegde: If You Build A Smart Battery Charger Using a Single-Transistor Circuit, Beware the Consequences.

In case a turn-on of the SCR above 430 V is not desired, or in case the surge current exceeds the SCR I TSM capability when the device is triggered by the Transil, there is another solution: using ...