The fan is necessary for keeping your helmet visor free of fog. It doesn't contribute to the voice speaker at all.
I used 40mm x 10mm cage fans (https://www.amazon.com/gp/product/B07RMY75GH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1).
Simple Helmet Speaker System
- Thread starter MoeSizzlac
- Start date
I used 40mm x 10mm cage fans (https://www.amazon.com/gp/product/B07RMY75GH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1).
Ian Cubito
New Member
Here is what we call a real man,thanks a lot!
TheRealVictor
Member
sweet!
Sharpworks
Member
Can I wire a second speaker in parallel from the amp or will that draw too much power? Or do you think that's overkill? I'm making a halo reach commando helmet and I think the two grills by the cheeks are prime real estate for some speakers
I would. You will just draw more juice from the batteries as the drawback.
Sharpworks
Member
Awesome, thanks. Also, how necessary would you say the resonator you designed is? The spot I'm looking at using doesn't really have space for that
I think it's pretty important to have some sort of echo chamber so that the speaker is more effective. Otherwise, you may not like the results. You can use any resonator you see fit for your helmet, so long as you have one.
- Member DIN
- S097
For a speaker to be effective, the front must be isolated from the back or else they will interfere and cancel out. As long as you do that you should be fine. The added benefit of mounting it in a port is that you may be accentuating speech frequencies which make it clearer.
Sharpworks
Member
I wired mine up but it’s super quiet how do I make it louder
Sharpworks
Member
I ended up using a 300k Ohm resistor instead of a 4.7M. It's much louder now.
3DVagabond
Active Member
It's a very useful tutorial. But have you ever thought about replacing the 3 AAA Batteries for an A23 battery for a power source? It's smaller and it has a higher voltage of 12 volts.
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While it may change some tweaks here and there, this could definitely work too since the sound amplifier takes anywhere from 5-12 volts to operate. No idea on the longevity vs the 3 AAA.
Coreforge
Member
If it's smaller but the same type (alkaline/lithium) it won't last as long. If it draws more power due to the higher voltage, the battery will last en even shorter time. A small boost converter is probably better as you can use bigger batteries and still get 12v without needing 8. You might need a bit more filtering though with a boost converter depending on the working frequency of the converter.
3DVagabond
Active Member
Okay, so I'm going to admit that I am not an expert on how long the A23 Battery will last, but if I had to make a wild guess on the length of time it would work, it could be over 12 hours of usage. The only way to find out it through experiementation.
Coreforge
Member
Sharpworks had the same issue a few posts up and using a lower value resistor fixed it. My guess is that the input impedance of the amplifier is a bit too low, so the voltage drops too much if the resistor is too big, as it doesn't let enough current flow. A smaller resistor allows a higher current, so the voltage doesn't drop as much. 300k is still fairly big, so you probably won't have to worry about the current being too high, but it should be about 15 times higher than with a 4,7M resistor. If you don't have different resistors, you can also put multiple resistors paralell to decrease their resistance.
Thanks!
TecnicoNinja
Member
That's an awesome tutorial, hope to try this out sometime myself
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