Piezo disk or sounder
- Thread starter RexLan
- Start date
Rickharris
Senior Member
One option is to drive the piezo from a higher voltage via a suitable driver ( e.g. transistor) another is to drive the Pizeo with a push pull cct. Another option is to go to a speaker. and perhaps a simple amp e.g. an LM 386.
Manual 3 page 10 refers
Manual 3 page 10 refers
hippy
Ex-Staff (retired)
I've found the piezos I've used to be annoyingly loud so it could be the piezo type.
Resonant frequency can play a great part so as manuka suggests try adjusting the SOUND or TUNE value ( or PWM frequency if using that ).
Bigger piezos seem to be louder than smaller ones and how they are mounted makes a difference. The ones I use are in a plastic circular case rather than bare piezo. You can gain a lot by taping a piezo to a flat surface with a hole cut for the sound to come out. Horns ( toilet roll or kitchen foil tubes ) can improve things but make the sound more directional.
Resonant frequency can play a great part so as manuka suggests try adjusting the SOUND or TUNE value ( or PWM frequency if using that ).
Bigger piezos seem to be louder than smaller ones and how they are mounted makes a difference. The ones I use are in a plastic circular case rather than bare piezo. You can gain a lot by taping a piezo to a flat surface with a hole cut for the sound to come out. Horns ( toilet roll or kitchen foil tubes ) can improve things but make the sound more directional.
None are going to sound really loud outdoors without healthy driving and/or at resonance.
Rexlan doesn't say whether his t-ducers are in a resonant molded thing or just the thin flat disk things. It makes a HUGE difference.
As said above the enclosure will be at resonance and increases the volume around the centre frequency hugely.
Check places like Farnell and Digikey . Get the Data Sheets and you'll usually see a frequency response graph to show you best ranges of frequency to run them.
If you just want a single frequency warning peeper then spend the extra 50p for one with a driver.
Rexlan doesn't say whether his t-ducers are in a resonant molded thing or just the thin flat disk things. It makes a HUGE difference.
As said above the enclosure will be at resonance and increases the volume around the centre frequency hugely.
Check places like Farnell and Digikey . Get the Data Sheets and you'll usually see a frequency response graph to show you best ranges of frequency to run them.
If you just want a single frequency warning peeper then spend the extra 50p for one with a driver.