Controlled Charger for Nicads

Controlled Charge System for Nicads

Rudi, DL2RM described his charger for nicad batteries in Sprat number 79. It incorporates a mains timer programmed as follows:

8 hours charge - 2 hours off - 2 hours charge - 2 hours off - 2 hours charge - 4 hours off - 2 hours charge

The idea is to prevent Nicads overheating towards the end of the charge.

Resistor R must be calculated from the formula:

R = 5v / charging current

Care should be taken to select R for the type of nicads being charged and it is noted in the article that this must not exceed 1A.

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