I have Built a battery charger using the Circuit attached below . it is working OK but only when there is no load connected to the battery .
It starts up in the right state and when a battery is connected it switches to the Bulk Charge Mode ie Red LED Q3 and Yellow LED Q2 on Yellow LED Q1 Off and the bulk Charge voltage is also correct 13.8V . when battery is fully charged it switches to Float Charge Mode Yellow LED Q1 on. LED Q2 & Q3 Off Float charge Voltage 12.5v .
But when i connect a load to the battery it stays in bulk charge mode permanently LED Q2 & Q3 on and never switches back to float charge mode . the Load is just a micr-controller board with a LCD screen which is rated at 500mA .
Can any one please help me solve this problem as i am at a dead end . i have substituted a variable 10K resistor for R9 but it has not helped .
Many Thanks in Advance
