This will be my last project for a while, at least until the weather gets warm again. I've built a lot of boomboxes but none of them have been battery powered -- maybe they are more accurately called 'tabletop radio'. I wanted to give that a shot and also try something with a basic crossover.
The drivers are the ND65-8 and the ND16FA. The woofer plays full range and the tweeter is high-passed somewhere north of 3000Hz (I think?) using a 3uF cap and an L-pad. The box is tuned to around 60Hz using a 5" long port made from 1" PVC. The internal volume is about 210ci but with all the components the net is more like 180ci.
I'm using the Dayton KAB-BE battery boards, two of them wired in parallel using the included connectors, and some LG flat top 18650 cells. I was concerned about using them without one of the Dayton/Sure bluetooth amp boards, but I haven't had any problems so far. They're wired directly to the charging port and I added a voltmeter to keep an eye on the charge level. I am using a 19V supply for charging and the TA2024 amp and BT4.0 board are only rated to 15V, so the circuit disconnects the audio components when charging. This means it can't play when plugged in, but with ~5Ah on tap I hope it won't need to charge often.
I'm extremely pleased with the sound. The ND65 is a surprisingly powerful little driver. At the end of the day I'm not sure it even needed the tweeters, but the end result has been very satisfying.
I have more build pics if anyone is interested.
The drivers are the ND65-8 and the ND16FA. The woofer plays full range and the tweeter is high-passed somewhere north of 3000Hz (I think?) using a 3uF cap and an L-pad. The box is tuned to around 60Hz using a 5" long port made from 1" PVC. The internal volume is about 210ci but with all the components the net is more like 180ci.
I'm using the Dayton KAB-BE battery boards, two of them wired in parallel using the included connectors, and some LG flat top 18650 cells. I was concerned about using them without one of the Dayton/Sure bluetooth amp boards, but I haven't had any problems so far. They're wired directly to the charging port and I added a voltmeter to keep an eye on the charge level. I am using a 19V supply for charging and the TA2024 amp and BT4.0 board are only rated to 15V, so the circuit disconnects the audio components when charging. This means it can't play when plugged in, but with ~5Ah on tap I hope it won't need to charge often.
I'm extremely pleased with the sound. The ND65 is a surprisingly powerful little driver. At the end of the day I'm not sure it even needed the tweeters, but the end result has been very satisfying.
I have more build pics if anyone is interested.
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