Electronics Circuit Diagram

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure caused by a sound wave. Sound is usually measured with microphones responding proportionally to the sound pressure – p. The power in a sound wave goes as the square of the pressure.

The following schematic shows the 9 Volt Portable Sound Pressure Level Meter Circuit Diagram. This circuit is design to set adjusting all the loudspeaker outputs in a home cinema to the same level when heard from the listening position.

Portable Sound Pressure Level Meter Parts List

R1______10K  1/4W Resistor
R2,R3___22K  1/4W Resistors
R4______100K  1/4W Resistor
R5______100R  1/4W Resistor
C1______1µF  63V Polyester or Electrolytic Capacitor
C2______100µF  25V Electrolytic Capacitor
C3______220µF  25V Electrolytic Capacitor
D1-D4___BAT46  100V 150mA Schottky-barrier Diodes
IC1_____CA3140  Op-Amp IC
MIC_____Miniature electret microphone (See Notes)
J1,J2____4mm  Output sockets
SW1____SPST  Toggle or Slider Switch
B1______9V   PP3 Battery

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