Hello,
I am designing small "chatting box" for an artistic performance. The box is triggered when someone walks close to it. It uses infra red PIR proximity sensor. When triggered, the box outputs various sounds : voice, music, sounds effects. I use a Teensy micro-controller (similar to Arduino), a 5V lithium battery, a class D 3.2W mini-amplifier, and a compact full-range 4 ohms car loudspeaker (for tests). Everything is working, but I try to optimise the box to get the the loudest sound as possible. I need to find the right loudspeaker :
What kind of speaker would you recommend ?
What do you think of sound vibrating triggers ?
Any guidance welcome !
Emmanuel
I am designing small "chatting box" for an artistic performance. The box is triggered when someone walks close to it. It uses infra red PIR proximity sensor. When triggered, the box outputs various sounds : voice, music, sounds effects. I use a Teensy micro-controller (similar to Arduino), a 5V lithium battery, a class D 3.2W mini-amplifier, and a compact full-range 4 ohms car loudspeaker (for tests). Everything is working, but I try to optimise the box to get the the loudest sound as possible. I need to find the right loudspeaker :
- 4 ohms (or 8, but amp is designed for 4)
- full range. Bandwidth is not important here. I don't need big bass or extreme highs. I focus on meds + high meds.
- as small as possible : 2,5" or 3"
What kind of speaker would you recommend ?
What do you think of sound vibrating triggers ?
Any guidance welcome !
Emmanuel
you could have a look at this table which contains lots of "liked" fullrange speakers:
spectrumaudio
or use the loudspeakerdatabase:
loudspeakerdatabase
Looking at the forum´s favourites (haven´t heard them myself) I´d recommend 3FE222 & 3FE25 from Faital which exist in 4ohm versions.
spectrumaudio
or use the loudspeakerdatabase:
loudspeakerdatabase
Looking at the forum´s favourites (haven´t heard them myself) I´d recommend 3FE222 & 3FE25 from Faital which exist in 4ohm versions.
The Faital are nice, I use them.
What you want for the loudest sound is something efficient. Small speakers rarely are efficient, but take a look at the specs and compare. Small speakers that try to produce bass have to trade off efficiency for bass extension. Keep that in mind if you don't need bass.
What you want for the loudest sound is something efficient. Small speakers rarely are efficient, but take a look at the specs and compare. Small speakers that try to produce bass have to trade off efficiency for bass extension. Keep that in mind if you don't need bass.
5 volts doesn't give you much max volume. But maybe enough. I lot of little Bluetooth speakers run on 5V right
I like 12 volts.
Speaking of Bluetooth speakers, they might be a good source of parts for this project.
I like 12 volts.
Speaking of Bluetooth speakers, they might be a good source of parts for this project.
Power banks use switching circuits to get 5V from the 3.7V battery inside.
That is a source of noise.
Stick to batteries and supply the circuit without any other elements.
As it is a fixed unit or large enough use a 12V battery or a linear supply ...less hassle with battery charging.
That is a source of noise.
Stick to batteries and supply the circuit without any other elements.
As it is a fixed unit or large enough use a 12V battery or a linear supply ...less hassle with battery charging.