Stereo Audio Power Meter

Posted on Nov 26, 2012

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
Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Simple CB transmitter with BD329
Ir Remote Extender
Engine Block Heater Minder Circuit
Analog Clock And Temperature sensor On An Oscilloscope using Arduino
Six LED Stereo VU Display
Telecard reader with AT90s2313 micro
Frequency electromagnetic RBI timer CD4017