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WARNING - NOT TO EVERYONES TASTE
i was going through my garage an noticed the big box of parts/speakers etc i had still, which is probably like most of these forums, for some reason i had 4x DMA45-4's and 4x DM45-8;s. Of course for some of these DIY electronic projects, you buy in bulk from a slow boat in asia and find yourself with 10 of everything.
So a little bit of CAD later, testing some new filament (matt PLA) and experimenting with a larger 0.6mm nozzle, i started designing another of these tiny BT speaker. The idea was to just go small, use whatever was down in the garage and power it off those lovely 18350 batteries i picked up from the local vape store.
Parts
DMA45-4
https://www.parts-express.com/Dayton-Audio-DMA45-4-1-1-2-Dual-Magnet-Aluminum-Cone-Full-Range-Driver-4-Ohm-295-580
DMA58-pr
https://www.parts-express.com/Dayton...diator-295-593
AMP/BT CHIP CSRA64215
LI ION 18350 Battery
Buck converter to 6.5v
USB C breakout board
TP4057 BMS
SPST switch
1.5mm dia button top LED.
Passive membranes (52mmx 2, 70x40mm x2)
Something i noticed when writing this and doing some screen shots of WinISD, is i actually stuffed up and ran the wrong driver as I had the CE65w in it and not the DMA45's, which is a tad embarrasing, but here goes. The sim was run using 2x DMA45's and the 2xDMA58-PR as the passive membranes were excluded due to not having any information for them. the F3 is around 160hz, F6 110hz and F10 around 70hz. If the count of the passives gets increased to match the 6 in the build this number gets a little better.
These little amps apparently can put out 4Ohm 5W when using 6.5volts and with the programmer you can customise the BT Name, EQ settings etc, which on this one i didnt. From the tests i've done with the Boozetooth builds, the QCC3003 is a little better and has more features like bass boost, cross overs and an internal buck converter (which i havent used). You can also add some swtiches to control the volume, track previous/next and play/pickup phone calls and add a mic..
i was going through my garage an noticed the big box of parts/speakers etc i had still, which is probably like most of these forums, for some reason i had 4x DMA45-4's and 4x DM45-8;s. Of course for some of these DIY electronic projects, you buy in bulk from a slow boat in asia and find yourself with 10 of everything.
So a little bit of CAD later, testing some new filament (matt PLA) and experimenting with a larger 0.6mm nozzle, i started designing another of these tiny BT speaker. The idea was to just go small, use whatever was down in the garage and power it off those lovely 18350 batteries i picked up from the local vape store.
Parts
DMA45-4
https://www.parts-express.com/Dayton-Audio-DMA45-4-1-1-2-Dual-Magnet-Aluminum-Cone-Full-Range-Driver-4-Ohm-295-580
DMA58-pr
https://www.parts-express.com/Dayton...diator-295-593
AMP/BT CHIP CSRA64215
LI ION 18350 Battery
Buck converter to 6.5v
USB C breakout board
TP4057 BMS
SPST switch
1.5mm dia button top LED.
Passive membranes (52mmx 2, 70x40mm x2)
Something i noticed when writing this and doing some screen shots of WinISD, is i actually stuffed up and ran the wrong driver as I had the CE65w in it and not the DMA45's, which is a tad embarrasing, but here goes. The sim was run using 2x DMA45's and the 2xDMA58-PR as the passive membranes were excluded due to not having any information for them. the F3 is around 160hz, F6 110hz and F10 around 70hz. If the count of the passives gets increased to match the 6 in the build this number gets a little better.
These little amps apparently can put out 4Ohm 5W when using 6.5volts and with the programmer you can customise the BT Name, EQ settings etc, which on this one i didnt. From the tests i've done with the Boozetooth builds, the QCC3003 is a little better and has more features like bass boost, cross overs and an internal buck converter (which i havent used). You can also add some swtiches to control the volume, track previous/next and play/pickup phone calls and add a mic..
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