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Multi-Way Conventional loudspeakers with crossovers

My bluetooth speaker project
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Old 4th November 2017, 08:34 PM   #11
ZipSnipe is offline ZipSnipe  United States
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Yes it shuts down upon turning on the amp. Like I said it runs fine off the wall wart. The specs on the amp call for no less than 12volts 3.5 amps input voltage. The specs on the battery are 12v 3 amps. The battery seemed quite light from the get go, I was suspicious it would power it at all.
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Old 4th November 2017, 09:23 PM   #12
Mooly is offline Mooly  United Kingdom
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My bluetooth speaker project


Threads have been merged. One thread per topic please. Both this and your other thread were discussing batteries and power sources.
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Old 4th November 2017, 11:53 PM   #13
ZipSnipe is offline ZipSnipe  United States
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Quote:
Originally Posted by infinia View Post
Investigate Hobby Lipo battery packs.

look here Lipo Finder
Thanx Infinia, I know all about hobby batteries, I fly several types of drones weekly. I am looking towards a compact all in one li-on designed battery that has the charger and protection circuit built in
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Old 5th November 2017, 04:58 PM   #14
cfaye is offline cfaye
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Sounds like the protection board is kicking in. I bet that is also probably a 3s batter. So 12v when newly charged, but really only a 10.8v battery in use. You will probably have more luck with your 4s Makita pack. Even better would be a 5s for 18v tools. They provide a lot of amps and it is easy to find legitimate 5ah packs.
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Old 5th November 2017, 11:03 PM   #15
ZipSnipe is offline ZipSnipe  United States
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Well I am looking at these sla batteries, had I thought about the battery situation a lil more before I put my front woofer plate on(wood glued), the batteries would not be that big of a deal . The only batteries that will fit are too underpowered. And the batteries I need are a just too big. The drill batteries will only run it for about 15 to 30 minutes ,maybe an hour at half volume. So maybe I will pry the front plate off so I can get a bigger battery up inside the woofer enclosure.

Or....maybe just leave it as a wall wart speaker :-(
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Old 6th November 2017, 08:30 AM   #16
infinia is offline infinia  United States
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7AH SLA is only rated for long term current draw @ low current ~C/20. Pulling 3A from will give you about 1/4 of its AH & drawing it down any longer than that decreases avail battery cycles E.g lifetime. so this path leads to bigger, heavier, and less run time than a 18V 2AH tool battery. If you really want to run off of batteries use low volume Spl's, or higher efficiency amp and speakers. Do a search for 'Boominator' for solutions..

Quote:
I know all about hobby batteries
Rather than dismissing my suggestions, tell us why this wont work. AFAIK this is the most compact battery w/ good cheap chargers, all avail. off-the-shelf.
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Last edited by infinia; 6th November 2017 at 08:40 AM.
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Old 7th November 2017, 04:20 AM   #17
ZipSnipe is offline ZipSnipe  United States
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Originally Posted by infinia View Post


Rather than dismissing my suggestions, tell us why this wont work. AFAIK this is the most compact battery w/ good cheap chargers, all avail. off-the-shelf.
The problem with lipo's would be the maH rating, most only go up to 5500maH and I really need 15 to 40 aH . Unless I am wrong and lipo's maH rating is different than other batteries? I mean I guess I can try out a lipo I do have a 4s 4200maH lipo from my large drone I could try
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Old 7th November 2017, 11:32 PM   #18
ZipSnipe is offline ZipSnipe  United States
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Ok test was great, ran the speaker at 90% volume for 30 minutes and only dropped .4 volts on my 4s 4500maH 14.8 volt lipo which means I could safely run it 2 1/2 hours at 90% volume if needed.

This is great because, now I can buy batteries for this and still use them on my drone of needed !!!
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Old 8th November 2017, 01:26 AM   #19
cfaye is offline cfaye
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That's good news! You should get yourself a BMS, or at least a voltage alarm. Lipos are expensive to brick.
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Old 8th November 2017, 06:10 AM   #20
infinia is offline infinia  United States
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Quote:
Originally Posted by ZipSnipe View Post
Ok test was great, ran the speaker at 90% volume for 30 minutes and only dropped .4 volts on my 4s 4500maH 14.8 volt lipo which means I could safely run it 2 1/2 hours at 90% volume if needed.

This is great because, now I can buy batteries for this and still use them on my drone of needed !!!
Do some more current draw measurements. Play with the volume and find a sweet spot for low power dissipation. Your reported 3A is plainly stupidly high for any reasonable battery packs. You would be lucky to get 45 minutes w/o going in to early cell death territory. I doubt you can estimate run time from looking at voltage drop. Only if you have the data and done several discharge curves from actual empirical tests. I have a feeling the Lipo packs are aggressively optimistic their ratings compared to top tier 18650 cells.
OR just find the weakest cell under load and monitor it with a cheap DMM done...
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Last edited by infinia; 8th November 2017 at 06:26 AM.
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