mritchey99
Newbie
Hey all, this is my first time on this forum and I really need the help! I'm currently designing an amplifier for a 400mVpk signal (wav file of the human voice coming out of a PCM channel of an STM32 MCU.) I'm using the Taoglas - SPKM.17.8.A - 17mm Mini Speaker.
This speaker is quite small (17mm in diameter) and after hooking it into my LM386-driven amplifier circuit, it's still very quiet. In fact, using a signal generator, even with a high voltage and 1kHz sine wave, the speaker is too quiet. The speaker needs to be loud enough to be heard when worn on the wrist.
I'm having trouble understanding why the speaker is still so quiet even though it's larger than many speakers I find in say a phone or computer monitor. I've started to wonder if this is more of a mechanical and physics issue. Do I need a baffle for the sound it's producing to be more audible or is this speaker not meant to be used in the scenario?
I couldn't figure out how to upload a picture but I'm using the LM386 amplifier from TI's datasheet (page 10):
www.ti.com/lit/ds/symlink/lm386.pdf
This speaker is quite small (17mm in diameter) and after hooking it into my LM386-driven amplifier circuit, it's still very quiet. In fact, using a signal generator, even with a high voltage and 1kHz sine wave, the speaker is too quiet. The speaker needs to be loud enough to be heard when worn on the wrist.
I'm having trouble understanding why the speaker is still so quiet even though it's larger than many speakers I find in say a phone or computer monitor. I've started to wonder if this is more of a mechanical and physics issue. Do I need a baffle for the sound it's producing to be more audible or is this speaker not meant to be used in the scenario?
I couldn't figure out how to upload a picture but I'm using the LM386 amplifier from TI's datasheet (page 10):
www.ti.com/lit/ds/symlink/lm386.pdf