The camera I’m using for this example is a Samsung NX1000 Smart Camera. The camera is activated when the external trigger contacts are shorted to ground; so the circuit we’re making shorts a signal to ground whenever there is a “loud” noise.
•SimpleCircuit Microphone Board
•SimpleCircuit N-Channel MOSFET
All Simple Circuits can be found on our Kickstarter Page
Step 1: The Schematics
Connect the output of the microphone to the voltage comparator circuit (Second Schematic)
Connect the output of the Comparator to the N-CH MOSFET
Connect the Drain of the N-CH MOSFET to the camera trigger
The third Schematic is the entire design redrawn with Simple Circuits!
5V for VCC works well. You could go as high as 12V or as low as 3.3V if you need to.
DON'T FORGET GROUND!