I am trying to amplify the volume for some piezo I have:
PKLCS1212E4001-R1: Buzzer SMD 4Khz or
I use tone() to generate different tones(from 500Hz to 2KHz) on D6 pin of Arduino Pro Mini 3.3v. My current system is running with a Lipo battery 3.7v, sometimes with charger.
The system is drawing 5mA current and I want to keep it down as possible, but the sound I need it louder, as I use it outside.
I tried with 74HC14 this:http://hackerspace-ffm.de/wiki/index.php?title=Datei:PWM_8Bit_MonoAmplifier_Steckplatine.png
with a speaker but my Arduino is not responding when is connected to breadboard of 74HC14.
How can I amplify the sound to be louder, but to keep the current as down as possible(max 10mA). I would like to use the PKLCS1212E4001-R1 because of it's size.
P.S. I have for moment: LM386, 74HC14, max232, BC547B, BC8550, BC557C, 2N3904.