Voice Recorder-Playback | Electronic Project Circuits

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Digital Voice Recorder-Playback UM5100

This Circuit is based on the UM5100 which can record speech into a digital memory and then play it back. The device is designed to be used directly with static RAM’s up to 256K bits, or with EPROM ‘s or ROM’s for playback only. High quality voice reproduction is possible and note that it is not a “computer voice”, it is the original speaker’s voice played back. The bit rate is adjustable from 10kbs to 28kbs with higher quality at faster bit rates.

Source: http://www.next.gr/inside-circuits/
Digital-Voice-Recorder-Playback-UM5100-l5872.html

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Categories: Audio diagram Tags: Recorder Audio, Voice Recorder-Playback

Voice Record / Playback Circuit

The ISD1000A is a Direct Analog Storage device which allows you to store 20 seconds worth of voice data on an IC chip which can be play backed anytime. The data stored will stay in memory even if the power is removed. To use the circuit below simple apply power to the circuit, press the record button and hold. Speak clearly into the microphone. You have up to 20 seconds of voice message that you can store. If you talk beyond that time the chip will only store the first 20 seconds. After recording, release the record button. To playback the message, press the playback message and the message you recorded will play back. The microphone is an electret mic and the speaker is a 8 ohm speaker. If you use a 16 ohm speaker then the 10 ohm resistor marked optional, can be eliminated. This circuit can be the basis of many other larger projects. For example it could be part of an alarm circuit which plays back a voice warning when the alarm circuit is triggered.