2 layer board of 1.09 x 0.74 inches (27.7 x 18.9 mm)
Uploaded:
February 19, 2024
Shared:
December 05, 2025
Total Price:
$4.05
Uses AH1392 magnetic sensor to switch a LiPo battery on and off with a magnet pointed either up or down. Power consumption when off is not zero so a small battery will last weeks, not months.
Optional USB charging circuit. Maximum battery voltage 7V. Best battery is 1S LiPo.
Parts List:
| Name |
Part No. |
Description |
| MAG1 |
AH1392-HK4-7 |
Magnetic sensor (DFN1410 package) |
| Q1 |
DMP1045UQ |
Power P-MOSFET SOT-23-3 package (Alternatives: TSM650P03CX or NTS4101P or a zillion others.) |
| Q2 |
BSS138 |
Signal N-MOSFET SOT-23-3 package |
| R1, R2 |
5.1K |
resistor 0603 size |
| C3 |
22pF |
capacitor 0805 size |
| C2, C4 |
4.7uF |
capacitor 0805 size |
| D3, D4 |
BAT20JFILM |
Schottky diode SOD-323-2 |
| CS1 |
BCR402WH6327 |
Current Source |
| POWER |
LR Y8SF-U1V2-1 |
Side-firing LED (red) 0603 size |
| BATT |
S2B-PH-SM4-TB |
JST-PH battery connector |
OPTIONAL battery-charging circuit
| Name |
Part No. |
Description |
| U1 |
MCP73831T-2ACI/OT |
Charge Controller |
| USB1 |
CUI UJ2-MIBH-G-SMT-TR |
Micro USB connector |
| C1 |
4.7uF |
capacitor 0805 size |
| R3 |
5.1K |
resistor 0603 size |
| CS2 |
BCR402WH6327 |
Current Source LED driver |
| CHARGE |
150060VS55040 |
0603 size LED (green) |
Uses AH1392 magnetic sensor to switch a LiPo battery on and off with a magnet pointed either up or down. Power consumption when off is not zero so a small battery will last weeks, not months.
Optional USB charging circuit. Maximum battery voltage 7V. Best battery is 1S LiPo.
Parts List:
| Name |
Part No. |
Description |
| MAG1 |
AH1392-HK4-7 |
Magnetic sensor (DFN1410 package) |
| Q1 |
DMP1045UQ |
Power P-MOSFET SOT-23-3 package (Alternatives: TSM650P03CX or NTS4101P or a zillion others.) |
| Q2 |
BSS138 |
Signal N-MOSFET SOT-23-3 package |
| R1, R2 |
5.1K |
resistor 0603 size |
| C3 |
22pF |
capacitor 0805 size |
| C2, C4 |
4.7uF |
capacitor 0805 size |
| D3, D4 |
BAT20JFILM |
Schottky diode SOD-323-2 |
| CS1 |
BCR402WH6327 |
Current Source |
| POWER |
LR Y8SF-U1V2-1 |
Side-firing LED (red) 0603 size |
| BATT |
S2B-PH-SM4-TB |
JST-PH battery connector |
OPTIONAL battery-charging circuit
| Name |
Part No. |
Description |
| U1 |
MCP73831T-2ACI/OT |
Charge Controller |
| USB1 |
CUI UJ2-MIBH-G-SMT-TR |
Micro USB connector |
| C1 |
4.7uF |
capacitor 0805 size |
| R3 |
5.1K |
resistor 0603 size |
| CS2 |
BCR402WH6327 |
Current Source LED driver |
| CHARGE |
150060VS55040 |
0603 size LED (green) |
