Summary of ISD4004 based voice recorder
This project describes a voice recorder utilizing the ISD4004 chip, capable of recording 8 to 16 minutes of audio. It requires an ATmega8 microcontroller for SPI communication control and an LF33CV regulator to provide the necessary 3.3V power supply. Audio output is amplified using an LM386 amplifier, allowing for integration into projects like IVS or robots.
Parts used in the ISD4004 Voice Recorder:
- ISD4004 Voice Recording IC
- ATmega8 Microcontroller
- LF33CV Voltage Regulator
- LM386 Audio Amplifier
- 1kohm Resistor
So far we have seen various devices that are talking, such us cars, dolls etc.This project is also like one of them. you can use it in various projects such us IVS, robots etc.
There are various voice recording IC’s. They have different recording time and sampling frequency. Most of the IC’s can record less than 1min of sound.
ISD4004 can record 8min to 16mins maximum. If you select high sampling frequency then you can record a max 8mins at high quality. This project gives you a voice recorder based on this chip.
You can’t use this IC without a microcontroller since it works on SPI communication. So you need a microcontroller to play/record the audio. Here ATmega8 is used to play and record the chip. This is the pin diagram of the IC ISD4004
This IC works on 3.3v, so we need a regulated 3.3v using LF33CV. The audio output from the Voice0 chip is amplified by an audio amplifier. This amplifier is done with Lm386.
If you want to give audio from PC, then select the first circuit and connect a 1kohm resistor in series with the input.
For more Detail: ISD4004 based voice recorder
- What is the maximum recording time of the ISD4004?
The ISD4004 can record between 8 minutes and 16 minutes depending on the selected sampling frequency. - Can the ISD4004 operate without a microcontroller?
No, you cannot use this IC without a microcontroller because it works on SPI communication. - Which microcontroller is used in this specific project?
The ATmega8 microcontroller is used to play and record audio with the chip. - How is the power supply regulated for the IC?
A regulated 3.3V is required, which is provided using the LF33CV regulator since the IC works on 3.3V. - What component is used to amplify the audio output?
An LM386 audio amplifier is used to amplify the audio output from the Voice0 chip. - How do you connect audio input from a PC?
Select the first circuit and connect a 1kohm resistor in series with the input. - Does the ISD4004 support high quality recording?
Yes, selecting a high sampling frequency allows for a maximum recording time of 8 minutes at high quality.
