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Simple and practical lithium battery charger circuit

Published on Mar 17 2011 // Electrical Circuits

Description: A simple and practical self-made lithium-ion battery charger, changing the figure 4 ohm resistor can change the charge current, D1 is the power direction, D2 is the charging indicator and limit.
Simple and practical lithium battery charger

Simple and practical lithium battery charger circuit.

Changes in Figure 4 ohm resistor in the charging current can be changed, D1 is the power direction, D2 is the charging indicator and limit.
Debugging 6.8K resistor with a 10K resistor trimming substitution, with the digital meter to monitor battery voltage to 4.2V, the tone 10K resistor to 4.2V can be fine-tuning.