When the Nicd charger circuit is connected to the car battery, D2 lights only if the Nicad to be charged has been connected with correct polarity. For that purpose, the + terminal of the Nicad battery is connected to the base of T1 via R8. Because even a discharged battery provides some voltage, Ti is switched on and D2 lights.
Description for Mobile Nicd charger circuit
|1||Title:||Mobile Nicd charger circuit|
|3||Upload date:||January 23, 2012|