3rd Week

This week, we are planning to search the circuit that can be use in our project, and we have found the circuit in this link :
Circuit 1

Click Here!  >>>> http://www.ladyada.net/make/mintyboost/parts.htm <<<<
 
We use the latest version (v3) circuit.
Then we follow this link forum to become more familiar with the circuit in order to master it.

The forum have the explanation of every function of the component.
Below is the circuit and the explanation include, follow the number in order to understand the function.

 

1. The voltage divider circuit in point 1.1 and 1.2 is specially design for "Apple" devices.
    The voltage divider is used only for setting the right voltage on the data lines, they
    should not drain much current. Get the voltage, means get the Amp that required for
    this circuit. Bu using the ohm law formula, i used to calculate how much amp is
    needed for the circuit :

     # VA = V R1 / ( R1 + R2 ).

2. The diode on this circuit to prevent the voltage from go back to the IC.

3. Force the IC into current mode at light loads.

4. Inductor is use as a voltage step up.

5. This capacitor will use to support the battery during charging.

6. IC LT1302 is use to regulate the fixed output voltage (5V) instead; it can step up high
output current.

Circuit 2