as I sometime, have to recharge my cell, I thought I'd use 3.3V coming out of a LM3940 but the booster output drops to 4.4V while the output voltage of the LM3940 drops from 4.0V to 2.2V
I measured the curent while using the battery : 50mA and as I measure the current while using the LM3940, I get 0mA (my voltmeter precision beeing limited)
can someone explain to me what's going on ? the LM3940 can go up to 1A, I tried another one, same problem, how can I fix this ?
I'm using one... never DIY that fancy though, just clipped on the wires. The voltage never reach 12v but rather slightly just above 11v for mine, but it's sufficient to charge 6s.Ampere about 4A and slightly above.
mraha, have you measure the voltage output from it?