SIM900A GSM Module with Antenna

Description

• The two edge set VCC5 5V power supply interface, VCC4 interface, 3.5–4.5V power supply, optional power supply on self start (default) and start control. The SMA board (default) and IPXmini antenna interface, SIM900A interface reserved restoring.
• The serial port circuit: support 3.3V single microcomputer chip. TTL serial port support
• 3.3 and 5V single microcomputer chip.
• The SIM card circuit to increase the SMF05C ESD chip.
• antenna circuit: guarantee short and straight, so as to guarantee the signal strength.

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