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This Power Meter SELF-ASSEMBLY electronic kit is designed to be built into the Velleman K4020 MOSFET amplifier in order to display amplifier power output.
The meters are mounted behind the correct scale, which is also illuminated, according to the speakers connected to the amplifier (4 or 8 ohms).
When the amplifier is switched into a bridge configuration, then both meters can be connected in series.
Specifications