Laser sensor output to piezo buzzer

[quack1]

I'm new to electronics. I'm designing a product using a retroreflective laser emitter/sensor. The laser emits light that is reflected off a target back at the sensor. The laser is powered off of two 9V batteries in series (18V). It's rated consumption is 35mA and output is 100mA. In addition to its positive/negative leads, it has two negative outputs for control of alarm or other load.

I want the laser to send a signal to a piezo buzzer when light is reflected back at emitter/sensor from the target. The piezo buzzer is 3-16V DC 7mA. What would I need to put in the circuit to make this work...if it's even possible?

Thanks!

 

[smartsarath2003]

I think u can use a series resistor and a zener diode in reverse across your Lazer O/P and ground.The series resistor limits current to 7mA and Zener helps maintaining 16V or whatever req. across your buzzer. In this case u can use 280ohm and 16V Zener for max buzzer O/P

 

[IanP]

Or you can use 3 silicone diodes in series to drop 2.1V from the supply 18V. By doing this the cuurent will only go to the buzzer and will not drain unnecessarily the batteries..