electronic project about VOICE RECORD/PLAYBACK MODULE

[tomme1995]

Good day~
I am a engineer who like to make some electronic project by myself and I am also a distributor who sell consumer electronics and electronic components in 3Celectrons mall,if you have any question about buy electronic product,or troubles in project, welcome to discuss with me. Today I would like to share a project "LOW NOISE MINI ELECTRET MICROPHONE PREAMPLIFIER" here.
This Module has been designed around Nuvoton’s ISD1932 ChipCorder®, the newest single-chip multiple-message record/playback series with dual operating modes (address trigger and direct trigger) and wider operating voltage range from 2.4V to 5.5V. The sampling frequency can be selected from 4 to 12 kHz via an external resistor, which also determines the duration from 10.6 to 32 seconds. These ICs are designed mostly for standalone applications, and of course, it can be used in conjunction with a microcontroller.The two operating modes are address trigger and direct trigger. While in address trigger mode, both record and playback operations are manipulated according to the start address and end address specified through the start address and end address pins. However, in direct trigger mode, the device can configure the memory up to as many as eight equal messages, pending upon the fixed message configuration settings. With the record or playback feature being pre-selected, each message can be randomly accessed via its message control pin.The device has a selectable differential microphone input with AGC feature or single-ended analog input, analog in, under feed-through mode. Its differential Class D PWM speaker driver can directly drive a typical speaker or buzzer.Sampling Rate or Recording Time Selection R5: 53.3K 12 KHz sampling frequency 21.3 Seconds Voice RecordingR5: 80K 8 KHz sampling frequency 32 Seconds Voice RecordingR5: 100K 6.4 KHz sampling frequency 40 Seconds Voice RecordingR5: 120K 5.3 KHz sampling frequency 48 Seconds Voice RecordingR5: 160 4 KHz sampling frequency 64 Seconds Voice RecordingRefer Data Sheet of ISD1932 IC for More information http://www.nuvoton.com/hq/products/i...32?__locale=en
FEATURES
Wider operating voltage from 2.4 to 5.5VHigher sampling frequency from 4kHz to 12kHzVoice Recording Time 21 Seconds to 64 Seconds depend on sampling rate selection ( R5-OSC Resistor )FT: converts MIC+ to ANAIN & feeds it to the speakersR/P: record/playback switchREC: level or edge recordingPLAYE: edge-trigger, toggle on/offPLAYL: level playback or looping playbackLED: LED output for recordingLED Blinks for while at end of the message in play modeNORM (Address Trigger) : variable message durationMODE: (Direct Trigger) : fixed message duration
The complete article os here: http://www.electronics-lab.com/proje...d1932-isd1964/