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Automatic battery charger circuit with the voltage instructi

2016-05-12 00:28  
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Automatic battery charger circuit with the voltage instruction
The circuit is as shown in figure 4-6. IC is the LED electrical level indication integrated circuit which has ten output instruction ports. When the signal is added on the pin-5 of the output port, the internal circuit of this IC will compare the signal voltage and report the result through the level situation of the output port. If you connect the LEDs with every port of the IC, the LED can intuitively report the input signal voltage. The transistors VT1-VT5 can be used to detect the levels of the IC's output ports. When the output port which is connected with the transistor base has the low level, this transistor will conduct, the power will charge the battery through the c, e junctions and the current limiting resistance.