Mini Voice Recorder with PIC and EEPROM

Description

It is essentially an SPC01 with some parts removed and others added. In particular, to reduce cost and size, it was decided to mount only two of the four EEPROM memories and to use a single sampling frequency of 8 ksps; this still allows recording up to a maximum of 65 seconds of speech.
In place of these components, a microphone preamplifier and a speaker driver with volume control have been added to minimize the module’s size and the number of external components required for operation: in the end, the circuit, to work fully, requires only a microphone, a speaker, three pushbuttons, and power.
The user interface is now much simpler as some of the many functions implemented in the SPC01 module have been removed: only a simplified set of commands designed for easy and immediate use has been left.
In fact, it is possible to record only two messages, each playable via a specific pushbutton command; the two red and green indicator LEDs are still present, and it is possible, as in the more complete version, to clone the memories via a serial interface and a PC.

“Audio Transfer” Software

Used to read the contents of the SPC and transfer it to a new SPC. Download the “Audio Transfer” software.

Block Diagram

SPC02 Module

Accessories Not Included

Not included: the microphone, the speaker, the three pushbuttons, and the power supply.