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Four Input Event Triggered Message Module
Here to download MM1a Data Sheet 111kb
The MM1a Message Mate is a four input, event triggered message playback
system, using all solid state components. All features and functions
of the MM1a are microprocessor controlled using the Microchip PIC series
microcontrollers. The voice/playback design is based on the Information
Storage Devices' ISD2500 ChipCorder® series single-chip voice
record/playback devices. The MM1 100% CMOS design includes a built in
microphone, microphone preamplifier, automatic gain control, speaker
amplifier, power supply, and an external speaker terminal block (8 ohm
speaker). The ISD components use EEPROM, and will provide up to 100
years of power-off message retention.
The recording and playback quality of the Message Mate is excellent
! Each of the four messages can be individually recorded and played
back without altering the other three messages. Each message can be up
to 18 seconds in duration. The on-board CPU will monitor all activities
during message recording and playback. If a message is less than 18
seconds in length, the CPU will stop the playback when an End Of Message
marker is detected. For example, if the message is 10 seconds in
length, the playback will be 10 seconds in length (there will not be 8
seconds of silence at the end of the message). If the user tries to
record a message longer than 18 seconds, the "RECORD" led will turn OFF,
the status display will have a value of "18.0" (for 18.0 seconds), and
three quick beeps will be emitted by the on-board beeper.
An on-board 2 line 8-digit LCD has 3 different functions, depending
on the active mode:
Playback: The total seconds used by the playback
message are shown.
Record: The total seconds used by the recorded
message are shown.
Message Selection: Used to display the message selected
- Screw lug terminal block for all field signal inputs.
- Open Drain output for "playback active" indication.
- Individual status led's for trigger inputs.
- Individual test buttons for all four trigger inputs.
- On-board microphone for message recording.
- Speaker volume control.
- External speaker terminal block for 8 ohm speakers (speaker
- Mute button.
- Record inhibit jumper to prevent message recording (after field
Full Schematics with example connection diagrams
Click Here to
download MM1a Data Sheet 111kb
9-15 vdc @ 30ma (200 ma during playback). Power Supply is