B. INTEGRAL PARTS AND FUNCTIONALITY
B-6
BeFREE 20 – TECHNICAL OVERVIEW
the Left and to the Right Speaker. The amplifier can deliver up to 1 W of electric power to
the Central Speaker.
B.4.4.
Bar-Graph Displays
Each of the two bar-graph displays comprises 10 three-colour (red, green and orange)
LEDs. By default they constantly operate as VU meters in red colour, showing actual
levels of the respective speaker signals and the level of the microphone signal. Optionally,
the microphone signal can be disconnected from the VU meters.
If a rotation of an incremental encoder has been detected the respective bar-graph
automatically displays the gain of the respective amplifier in green colour. Volume UP and
DOWN keys can also be used to adjust the current volume settings, but simultaneously for
both speakers.
If a press of Brightness UP or DOWN key has been detected both bar-graphs
simultaneously display the current brightness setting of the LCD and all visual Indicators
in orange colour.
B.4.5.
Incremental Encoders
These (Left and Right Encoder in Figure B.1) are endless digital potentiometers used
for immediate volume control of the Left and the Right Speaker respectively. Each has 24
detents per revolution. Every single detent changes the volume for one step up or down,
but only every second one is represented by one LED in the corresponding Bar-Graph
display in green colour.
