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It can only be connected to single output speaker and has an onboard potentiometer to change the volume of the amplified signal
Based on this magnetic reed sensor
The PL2303 is a USB to TTL Converter module which operates as a serial communication (UART) bridge between one USB port and one standard RS232 serial port
DIP package
Output Voltage: 15 V
HT12D (RF Decoder) IC Barometric Pressure Sensor It can only be connectedThe HT12D Decoder ICs are series of CMOS LSIs for Remote Control system applications. For proper operation a pair of encoder decoder with the same number of address and data format should be selected (HT12E is paired with HT12D). The Decoder receive the serial address and data, transmitted by a carrier using an RF transmission medium and gives output to the output pins after processing the data. HT12D Specifications: Operating Voltage : 2. 4V ~ 12V
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