SMT package: easy to produce and process
Small size: 24*24*3mm
Low power consumption: standby mode current lower than 18mA, sleep mode lower than 2mA
Wide power supply range: 3.2 to 4.8V
Support frequency band: GSM/GPRS 900/1800MHz
Speech encoding: support half rate, full rate, enhanced rate
Echo suppression algorithm is supported. Echo suppression can be adjusted by AT commands on different client devices.
SIM900A module function1. New and cost-effective SIM900A GSM GPRS development board. The onboard SIM900A module is a brand new original 64M version with MMS function, not the old version of 32M.
2. SIM900A module On-board SIMCOM's industrial-grade dual-band GSM/GPRS module: SIM900A, operating frequency band dual frequency: 900/1800Mhz, can transmit voice, SMS (SMS, MMS), data and fax information with low power consumption.
3, SIM900A module supports RS232 serial port and LVTTL serial port, and with hardware flow control, support 5V ~ 24V wide working range, making this module can be very easy to connect with your product, so as to provide your products include voice, SMS and GPRS data transmission and other functions.
4, this module power requirements: 5V power supply, computer debugging USB power supply can meet the requirements of the initial computer. Because we added a large 1000UF capacitor. The long-term data transmission power consumption is recommended to be more than 1A DC, and the TTL level serial port is adaptively compatible with 3.3V and 5V microcontrollers. You can directly connect the microcontroller. Standby at about 80MA, you can set the sleep state at about 10MA low power consumption. Computer debugging USB-232 and USB--TTL can be, depending on the accessories. Support SMS, data, MMS, Internet access, etc. Reset the pin out, can realize unattended remote reset on site, with DTMF function to achieve remote control function.
5. The biggest advantage of the module is that it reserves 232 ports. It can monitor 51 low-end MCU and module instruction execution during learning or development, and can find out the reasons faster and save development and learning time. Supports 2, 3, 4G mobile phone cards.
Sim900a functional block diagramThe following figure shows the main features of the module:
GSM baseband
Memory
GSM radio frequency
Antenna interface
Other interfaces
High Voltage Laboratory Power Supplies
The LTP series laboratory high-voltage power supply is a high-voltage power supply specially designed for high-voltage laboratory applications with high precision, high stability, and low ripple output characteristics. Built in 19 inches, 2U standard chassis with designed output power at 1KW and output voltage ranges 1KV to 60KV.
After optimizing the output stability and output ripple on the basis of the 1KW high-voltage power module, the stability and ripple of the high voltage lab power supplies can reach the level at 0.1%.
The high-voltage laboratory power supply is also a constant-voltage and constant-current type high-voltage power supply. The output voltage and current can be continuously adjusted from 0 to the rated value via the added control potentiometers added to the front panel, high resolution LEDs display for output KV and mA are also added for intuitive measuring of high voltage laboratory bench.
The lab high voltage power supply is also equipped with DB9 interface as standard. Customers can apply 0-10V signals and dry contact signals to the interface according to our interface definition to achieve comprehensive control and monitoring functions on the power supply, like high voltage start / stop, output setting and reading.
The LTP series laboratory high voltage power supply is equipped with complete protection functions, which can deal with sparking, short circuit, overload, load discharge and other situations.
At present, the high-voltage laboratory power supply is mainly used in Laboratory power, High-voltage test stands, Electrostatics, Capacitor / Insulations testing and Electrophoresis applications.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com