This is my first audio project so I don't know very much ...
My goal is to power a 30W, 8 Ohm horn speaker so as to generate maximum loudness. Sound quality is not important.
I will be playing short 1-2 second audio clips about once per minute for 3 hours, so most of the time the speaker will be silent.
Ideally, the volume would be greater than 120dB @ 1m, but if not, the louder the better.
The audio input will be coming from a DFPlayer MP3 arduino module. The power source is a single 12V battery,
so I will need a voltage booster as well as an op-amp. I'm trying to work backwards from the speaker to determine
the minimum specifications for the op-amp (and voltage booster) in order to drive the speaker at its maximum power.
The first confusion I have is how the speaker power is specified. I've heard that they are commonly measured based
on RMS rather than peak to peak signal? I initially computed an (ideal) input voltage of sqrt(8 x 30) = 15.5V @ 1.93 amps.
But if that is based on RMS, then I need 2.828 x 15.5 = 43.8V peak to peak?
Next confusion relates to single vs dual voltage supply. For example TDA7292 has a maximum supply voltage of +/-33V,
so with dual voltage supply of +/-33V that would easily give me 43.8V peak to peak, but with a single voltage supply
(from single battery) it would only give 33V peak to peak?
Ideally I would like to purchase a prefabricated op-amp board (with heat sink?) and voltage booster board
that I could simply wire together as my soldering skills are not great. Are class D op-amps such as TPA3116D2 better
for my needs because they require only a single voltage source?
I'm happy to pay up to $30 each for the op-amp and voltage booster.
I'm looking to both increase my technical understanding as well as for specific board suggestions.
If I did purchase a variable voltage booster, how should I determine how high I can increase the voltage without
damaging the speaker or other components? I have a multimeter, but not an oscilloscope.
If I'm only playing for 1 or 2 seconds at a time, can the speaker handle peak power above 30W and will I still need a heat sink?
Thanks!
https://au.element14.com/yuasa/y12-12/battery-lead-acid-12v-12ah/dp/2083827
C2022 - Redback 30W 8 Ohm Plastic PA Horn Speaker - Altronics
My goal is to power a 30W, 8 Ohm horn speaker so as to generate maximum loudness. Sound quality is not important.
I will be playing short 1-2 second audio clips about once per minute for 3 hours, so most of the time the speaker will be silent.
Ideally, the volume would be greater than 120dB @ 1m, but if not, the louder the better.
The audio input will be coming from a DFPlayer MP3 arduino module. The power source is a single 12V battery,
so I will need a voltage booster as well as an op-amp. I'm trying to work backwards from the speaker to determine
the minimum specifications for the op-amp (and voltage booster) in order to drive the speaker at its maximum power.
The first confusion I have is how the speaker power is specified. I've heard that they are commonly measured based
on RMS rather than peak to peak signal? I initially computed an (ideal) input voltage of sqrt(8 x 30) = 15.5V @ 1.93 amps.
But if that is based on RMS, then I need 2.828 x 15.5 = 43.8V peak to peak?
Next confusion relates to single vs dual voltage supply. For example TDA7292 has a maximum supply voltage of +/-33V,
so with dual voltage supply of +/-33V that would easily give me 43.8V peak to peak, but with a single voltage supply
(from single battery) it would only give 33V peak to peak?
Ideally I would like to purchase a prefabricated op-amp board (with heat sink?) and voltage booster board
that I could simply wire together as my soldering skills are not great. Are class D op-amps such as TPA3116D2 better
for my needs because they require only a single voltage source?
I'm happy to pay up to $30 each for the op-amp and voltage booster.
I'm looking to both increase my technical understanding as well as for specific board suggestions.
If I did purchase a variable voltage booster, how should I determine how high I can increase the voltage without
damaging the speaker or other components? I have a multimeter, but not an oscilloscope.
If I'm only playing for 1 or 2 seconds at a time, can the speaker handle peak power above 30W and will I still need a heat sink?
Thanks!
https://au.element14.com/yuasa/y12-12/battery-lead-acid-12v-12ah/dp/2083827
C2022 - Redback 30W 8 Ohm Plastic PA Horn Speaker - Altronics