mobile phone solar charger

Why not simulate the circuit in multisim?

Before you mentioned the battery was 3.7v Now you say it’s 5.7v

The battery is 800mA-hr Not 800ma.


You cannot test the circuit I designed on a simulator as it does not take the impedance of the panel into account.

The output of the circuit will “magically adjust” to the voltage of your battery, so you don’t need any zener diodes.
As I said before, when the voltage of the panel reduces in voltage the current decreases enormously.
Internal lighting has “no energy” and the panel will not produce a worthwhile output.
Just put a diode on the panel and it will charge the battery when sunlight hits the panel.
The whole thing is much more complex than you realise and you are going about it entirely the wrong way.

Colin is the LED used as a voltage reference? At 0.4mA it won't light.

"Colin, is the LED used as a voltage reference? At 0.4mA it won't light."

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What do you mean?

0.4mA will be very dim for most LEDs.

blueroomelectronics said:

0.4mA will be very dim for most LEDs.

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hi Bill,
I would agree 0.4mA thru an LED, its going to be very very dim.

That's why I assumed it was not an indicator. I've seen LEDs used as shunt regulators.

blueroomelectronics said:

That's why I assumed it was not an indicator. I've seen LEDs used as shunt regulators.

Click to expand...

Perhaps we will find out when the designer comes back with an answer.?

i need a solar mobile chrger circuit diagram in which out put 3-5V and which input minimun number of solar pannel, how many solar pannel need and what will be the circuit diagram?

i need a solar mobile chrger circuit diagram in which out put 3-5V and 300mA, and which input minimun number of solar pannel, how many solar pannel need and what will be the circuit diagram?