i have use below circuit to built a car battery charging circuit (12V), the problem i face is the current still supplied to battery eventhough i switch on/off 'S2',
Before i switch on the power supply, but the battery is connected, RED LED will be ON
when i switch on the power supply, GREEN LED will be on, when i switch on/off the 'S2' , GREN LED will also be on, but the current is still charging.
when charging, RED LED will be on when i adjusted the charging voltage is lower than battery voltage, and 'S2' is off
NOTE: i have take out the 1N457 and connected directly because i cannot find in the market overhere, and i try replace by 1N4148, the result i get also failed
anyone can help me solve this problem?
i am taken this circuit at following link
**broken link removed**
latest edit
forget what i say at previous section,the final experiment as i done is also same with following diagram(without 1N457), after i connected to car battery and before switch on the power supply, 'charge' LED will on(S2 off), after i switch on the power supply,' float' LED will be on(S2 off),as a example, if i set the charging voltage is 14V, the voltage will be increase by slower and slower(13.1V,13.2V......), and the current also decrease by slower and slower(1A,0.5A0.3A,0.25A,0.24A,0.23A........ )
after i switch on the S2, 'charge' LED will be on and the charging voltage always 14V (if i set the charging voltage is 14V), and the current always 1A (always 1A if my input current is 1A)
so should i switch on the S2 when charging?
Before i switch on the power supply, but the battery is connected, RED LED will be ON
when i switch on the power supply, GREEN LED will be on, when i switch on/off the 'S2' , GREN LED will also be on, but the current is still charging.
when charging, RED LED will be on when i adjusted the charging voltage is lower than battery voltage, and 'S2' is off
NOTE: i have take out the 1N457 and connected directly because i cannot find in the market overhere, and i try replace by 1N4148, the result i get also failed
anyone can help me solve this problem?
i am taken this circuit at following link
**broken link removed**
latest edit
forget what i say at previous section,the final experiment as i done is also same with following diagram(without 1N457), after i connected to car battery and before switch on the power supply, 'charge' LED will on(S2 off), after i switch on the power supply,' float' LED will be on(S2 off),as a example, if i set the charging voltage is 14V, the voltage will be increase by slower and slower(13.1V,13.2V......), and the current also decrease by slower and slower(1A,0.5A0.3A,0.25A,0.24A,0.23A........ )
after i switch on the S2, 'charge' LED will be on and the charging voltage always 14V (if i set the charging voltage is 14V), and the current always 1A (always 1A if my input current is 1A)
so should i switch on the S2 when charging?
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