17 Channel Optically Isolated I/O Shield for Arduino Uno Using LOC111, PC817,6N137 Opto-couplers

17 Channel Optically Isolated I/O Shield for Arduino Uno The shield enables you to  interface many things to Arduino Uno , all I/O are optically isolated, The shield consist  8 Channel low speed outputs which can be used for on/off applications. 3 Channel high speed outputs frequency up to 10 MHz using 6N137. 4 Channel slow inputs using PC817 opto-coupler.

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LM386 SMD AUDIO AMPLIFIER CIRCUIT

The Tiny Audio Amplifier MODULE  is a good choice for battery operation. It is based on  LM386 IC, useful in various applications like robotics, science projects, intercom, FM radio and many more. Power Supply 6V-9V 300mW Output @ 8Ohms Load On Board Potentiometer for Audio Level Adjust Header Connecter for Supply, Signal in and Speaker On Board Power LED Input:

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