I’m rather new to electronics, and i’m working on building an alarm. However i can’t seem to figure out how to push my piezo to be louder. Currently i’ve hacked one of these ‘cheap’ personal alarms that can be bought at the hardware store and pulled out the piezo. Before doing so i measured 40v across the piezo from a mere 4.5 volts battery. I have many failed tries on trying different circuits to boost the power, using all sorts of different methods. Where i’m currently at i use an inductor and transistor like so:
wired up using:
- Arduino Nano
- BC550c transistor
- 100uH inductor
- 20mm piezo
Setup as shown on attachment.
The inductor and piezo is in the 5v output of the arduino.
When i measure across the piezo i get around 3.3v
Any idea what i’m doing wrong? How do i increase the volume/voltage across the piezo?
Thanks a lot in advance!