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The SIM800L GSM module and NEO-6M GPS module have different power requirements. Here's a breakdown of their current (ampere) needs:

1. SIM800L GSM Module

⚠️ Critical Note:
The SIM800L can draw very high current spikes (up to 2A) when transmitting data (e.g., sending SMS, making calls, or using GPRS). Your power supply must handle this surge.

2. NEO-6M GPS Module

Total Power Requirements

If both modules are running simultaneously, the worst-case scenario is:

However, if the SIM800L is idle, the total current drops to ~50mA (SIM800L) + 65mA (GPS) = ~115mA.

Power Supply Recommendations

Conclusion

Would you like a circuit diagram for powering both modules efficiently?

NEO-6M: 3.3V or 5V @ 100mA (can share power if stable).

SIM800L: Dedicated 4V @ 2A+ supply (battery + regulator).

Best Power Setup:

Recommended Power Supply: 3A capable (for safety margin).

Peak Current Needed: ~2.1A (when both are active + SIM800L transmits).

Use low-ESR capacitors (e.g., 1000µF) near the SIM800L to stabilize voltage during spikes.

Must provide at least 2.5A to handle SIM800L surges.

If Using a Single Power Source (e.g., 5V):

A 500mA LDO (e.g., AMS1117-3.3V) is sufficient.

For NEO-6M (3.3V/5V):

Better: Buck converter (e.g., MP2307) + capacitor buffer for surges.

LM317 is NOT recommended (too inefficient, can’t handle 2A spikes well).

Use a 2A+ capable power supply (e.g., Li-Po battery + good regulator).

For SIM800L (4.0V):

Total Peak Current Needed: ~2.1A

NEO-6M (Tracking): ~65mA

SIM800L (Transmitting): ~2A

Voltage Range: 3.3V - 5V (Recommended: 3.3V or 5V, depending on model)

Idle Current: ~30mA

Active Current: ~45mA - 65mA (while tracking satellites)

Voltage Range: 3.4V - 4.4V (Recommended: 4.0V)

Sleep Mode: ~1mA - 5mA

Average Current (Idle/Standby): ~10mA - 50mA

Peak Current (Transmit Mode): ~2A (during transmission bursts)