I was thinking about building a relatively cheap portable system using an SMSL SA1000 amp (50w). The reason why I was thinking of using this amp is because I don't need a 80W-100W+ amp and it has Bluetooth 5.0. I wanted to keep the power requirements as minimum as I could while still providing some decent level of power. The only issue is I am still having a tough time finding a batter pack/bank that isn't $250-400 to power it. The SMSL SA100's power supply is listed at 19V 6.73A.
The speakers i'm driving are Dayton Audio B652 6-1/2"
6 ohm
Sensitivity: 87 dB 1W/1m
40 watts RMS/75 watts max
Would anyone know of a way to power the SMSL for under $200? (wanted to keep this system fairly cheap)
The speakers i'm driving are Dayton Audio B652 6-1/2"
6 ohm
Sensitivity: 87 dB 1W/1m
40 watts RMS/75 watts max
Would anyone know of a way to power the SMSL for under $200? (wanted to keep this system fairly cheap)
Here is something that might help you understand better how to figure out what you need:
https://currentium.com/understanding-battery-capacity-the-watt-hour/
Kind regards,
Drew
https://currentium.com/understanding-battery-capacity-the-watt-hour/
Kind regards,
Drew
https://www.amazon.com/Adapter-Battery-Lithium-Convertor-Robotics/dp/B09653C14T/ref=sr_1_6?keywords=dewalt+20v+battery+adapter&qid=1651816157&sprefix=dewalt+20v+battery+ad,aps,127&sr=8-6&th=1
I'm doing something similar with a Dewalt adapter and their 20v batteries. They're readily available and easy to have multiples for longer play time.
I'm doing something similar with a Dewalt adapter and their 20v batteries. They're readily available and easy to have multiples for longer play time.
If you are ok with a bit of DIY, I would think the easiest and cheapest way would be to use an 18V Makita-style power tool battery pack. They contain 5x Li-Ion batteries, nominal 3.7V so a total of 18.5V nominal, and all the charging and undervoltage protection. (Sometimes they are listed as 21V battery packs, but it's hype... they can be charged at 21V but the nominal battery voltage is 18.5V). You can then buy a small bracket which makes it more convenient to attach to the positive negative terminals. Possibly you can find a creative way to bond that bracket to the amplifier and connect the 18V DC to the input DC jack of the SA100. Finally you need an AC/DC adapter to charge it. The charging intelligence is in the battery pack, so it's a very simple AC/DC adapter. The one I use puts out 21V at 0.7A.
Pics of my equipment attached.
Some items that appear suitable (not a personal recommendation but they look ok).
Bracket https://www.ebay.com/itm/393555730251 £6.41 in the UK.
Battery pack & charger bundle https://www.ebay.com/itm/363615030150 £16-£30 depending on battery capacity.
Hope it helps.
Rob
Pics of my equipment attached.
Some items that appear suitable (not a personal recommendation but they look ok).
Bracket https://www.ebay.com/itm/393555730251 £6.41 in the UK.
Battery pack & charger bundle https://www.ebay.com/itm/363615030150 £16-£30 depending on battery capacity.
Hope it helps.
Rob
Attachments
Very clever idea... I think i'm going to have to look into this. I was originally thinking of using this Batter Pack from BixPower: https://www.bixpower.com/product-p/cp100-dm90-24v.htm and then using one of their adapters to get the voltage right: https://www.bixpower.com/BX-DD90M-p/bx-dd90m-19v.htm
But they were saying that it wouldn't be enough power for using the amplifier (even though it seems like there very much would be). So i was curious on if there was some other potion that wouldn't be as expensive. So it would make sense that going the power tool battery route may be a better option.
But they were saying that it wouldn't be enough power for using the amplifier (even though it seems like there very much would be). So i was curious on if there was some other potion that wouldn't be as expensive. So it would make sense that going the power tool battery route may be a better option.
I do like that adapter set-up.... what are the terminals on the other end of the wiring? I think i'm going to have to look into this further.
I was originally thinking of using this Batter Pack from BixPower: https://www.bixpower.com/product-p/cp100-dm90-24v.htm and then using one of their adapters to get the voltage right: https://www.bixpower.com/BX-DD90M-p/bx-dd90m-19v.htm
But they were saying that it wouldn't be enough power for using the amplifier (even though it seems like there very much would be). So i was curious on if there was some other potion that wouldn't be as expensive. So it would make sense that going the power tool battery route may be a better option.
I was originally thinking of using this Batter Pack from BixPower: https://www.bixpower.com/product-p/cp100-dm90-24v.htm and then using one of their adapters to get the voltage right: https://www.bixpower.com/BX-DD90M-p/bx-dd90m-19v.htm
But they were saying that it wouldn't be enough power for using the amplifier (even though it seems like there very much would be). So i was curious on if there was some other potion that wouldn't be as expensive. So it would make sense that going the power tool battery route may be a better option.
The adapter I bought just had 2 wires, unstripped, out. My little amp used a standard power supply terminal, like for a laptop, so I just cut one of my spares and joined the wires.
The BixPower sure seems expensive, and using a step-down or step-up adapter will introduce a bit more inefficiency, and cost.
BixPower states 99Wh for their battery pack. A 6Ah power tool battery pack will be 6 x 18 = 108Wh, so quite similar capacity.
Audio Science Review testing shows SA100 can push 36W per channel into 4 ohm speakers before clipping, so in theory you might be drawing 72W from the battery, plus say 25% for inefficiency. But in reality typical music content is peaky, so maybe something like 10% of that: 72W * 1.25 * 0.1 = 9W. So you can expect something like 10 hours play time from a full battery (rough order of magnitude). I doubt either solution will be short of current, so I reckon it'll work fine.
I guess it might be risky to go beyond the voltage specified by SMSL, but the TPA3116d2 accepts up to 26V and I often run a similar amplifier (Breeze Audio TPA3116) with a 24V battery pack for a bit more peak power.
@Mooly - Apologies, I wasn't sure if my thread was in the right area. It will not happen again
@robjordan - Thank you for helping to talk through and explain some of the differences. I think i'll go the 6ah tool batter pack route as it sure makes things a bit easier/cheaper. For the charging aspect, i could either just make the battery easy to detach so i can charge like you would any sort tool battery. Or i could maybe? use this split dongle so i can split the charging and use into two separate jacks. That way i can keep the battery stationary and not have to fuss detaching it/reattaching it when needing a charge.
@robjordan - Thank you for helping to talk through and explain some of the differences. I think i'll go the 6ah tool batter pack route as it sure makes things a bit easier/cheaper. For the charging aspect, i could either just make the battery easy to detach so i can charge like you would any sort tool battery. Or i could maybe? use this split dongle so i can split the charging and use into two separate jacks. That way i can keep the battery stationary and not have to fuss detaching it/reattaching it when needing a charge.