Stereo Audio Power Meter

  
This circuit is used to meter the audio power output of an amplifier feeding a speaker. RY1 is actuated if excess
Stereo Audio Power Meter - schematic

power is fed to the speaker. Two channels are included for stereo applications. R1 and R2 and R3 form an attenuator. When a signal level is reached that produces a voltage across CI, comparator IC3A goes high, and IC4 and Q4 produce enough drive to Q3 to trip relay 1, which cuts off the speakers. LED21 will light as well. In addition, IC1 reads the voltage across CI. IC1 is a bar-graph driver, which lights bar-graph display LED1 through LED10. To read a maximum power level of 50W into 2ohm, R1 and R7 should be replaced by a piece of wire between the appropriate printed circuit board pads.




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