DVR-4 Digital Voice Recorder

The DVR-4 is a versatile pc board module, which is designed primarily as a voice recorder and playback module. The DVR-4 is optimized for use in applications other than radio repeaters, where a simple pushbutton control provides re-cording and playback.  A built in microphone allows the recording to be made without the need for external audio sources.  It includes a small electret microphone and pushbuttons for record and playback.

The 20 seconds of recording time can be broken up any way you like. You may want to enhance the basic circuitry by adding a switch to select any of several messages, for instance. Our manual will tell you how to access all the features of the unit so you can try different modes of operation.

The DVR-4 module is based on the ISD-1420A chip, using direct analog eeprom technology. The recording is good speech quality, equivalent to what you would expect using a cassette tape recorder. The solid-state recording lasts ten years or more and requires no battery backup.

SPECIFICATIONS:

• Audio input: electret or dynamic mic (on-board electret mic included)
• Audio output:  adjustable 0 to 1.5Vp-p; speaker - 75 mW into 16ohms (can use 8ohm speaker with series resistor).
• Control: on-board pushbutton switches for record and playback. External playback trigger easily done with external pushbutton switch or equivalent logic signal.
• Recording medium: non-volatile direct-analog eeprom. 10 year life without backup batteries.
• Record/erase cycles: up to 10,000.
• Frequency response: 200-2700 Hz.
• Distortion & hiss: less than 2%
• Power: +8 to +15 Vdc, 30 mA idle, 48 mA playback. (Has 5V regulator on board; can use 6V battery for portable operation.)
• Size: 2¾ x 2¾ inches.