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TAPELESS_RECORD_PLAY_DEVICE

2014-11-01 05:48  
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TAPELESS_RECORD_PLAY_DEVICE
The schematic for a record/play device with an audio power amplifier added is shown. ●A four-section DIP switch is used to activate the Chip enable, Power down, Playback, and Record functions.●An LED detects an end-of-message condition. It remains off during Record or Play and turns on when a message ends.●A three-terminal electret microphone is used for recording.●The only off-board components are the microphone, speaker, and power supply. For optimum sound, the speaker should be baffled (placed in an enclosure). Four 1.5-V AA cells can be used as a power source.