Have you tried to operate your original circuit without any modifications?
Are you sure that the LM301 amplifier can operate in single supply mode .... with only +15 volts?
Maybe try LM358 op-amp .... which is verified to be good for single supply operation.
i didn't try the original circuit because i cannot get the 1N457 overhere, but i have tried replace it by 1N4148, i still fail to get the result,
LM358 have 2 opamp, may i know how to connect it?
now my output is
battery connected, power supply off =charge LED on
power supply on =float LED on
battery connected, power supply on, S2off =float LED on (charging by increase voltage slower and slower,13.1,13.2,13.3.....,current decrease 1A,0.5A0.4A0.35A.......), by opinion, current is decrease and decrease when the battery is near fully charge
battery connected, power supply on, S2 on =charge LED on (V maintain at input charging voltage, 14V as example, current always 1A as example) ,by opinion, current would not stop when the battery is fully charge
through the link, i'm not clear about the explanation, so i'm not sure i'm correct or not, anyone can help me?
**broken link removed**