Hi,
I have purchased a box similar to this and would like to fit some sort of rudientary boombox inside it. I'm experience with the boombox side of it, just not so much with the audio part. Would i be best buying an existing product and just doing a teardown then using the parts or it would it be better to buy parts individually, pull out the old soldering iron and go about it that way.
Excuse me for any incompetence in the above post but i really am lost in the complex world of various speaker types and amps.
Robbie
I have purchased a box similar to this and would like to fit some sort of rudientary boombox inside it. I'm experience with the boombox side of it, just not so much with the audio part. Would i be best buying an existing product and just doing a teardown then using the parts or it would it be better to buy parts individually, pull out the old soldering iron and go about it that way.
Excuse me for any incompetence in the above post but i really am lost in the complex world of various speaker types and amps.
Robbie
I'd recommend getting a small amp, like the Lepai 2020 and some 3-way speakers from an old(-ish) stereo.
Pull the speakers apart and mount them on the box.
Depends how big the box is and what you can fit in there of course.
Pull the speakers apart and mount them on the box.
Depends how big the box is and what you can fit in there of course.
Class-d amp boards are better value for money than just about anything else, other perhaps than chip amps scrounged from scrapped TVs. Tthere's the TA2020, TA2024, and also the Yamaha YDA148. The YDA148 costs more, needs some heat-sinking for 4 ohm loads, but has some smart features like built-in protection from clipping (although I don't know if available boards actually enable this feature).
As for speakers... I keep running into dirt cheap 4x5 car speaker pairs at thrift stores and swap meets. YMMV. Be aware that these digital amps put out about the same power as "high power" car stereo head units, which could be far too much for speakers scrounged from store-bought boomboxes and radios. (One ghetto blaster I tore apart turned out to have chip amps rated at 0.1 watt RMS.)
As for batteries... 12V sealed-lead-acid is a good match; 12V NiMH or NiCd tool battery packs should also work. Lithium-ion voltages aren't so convenient; 3-cell 12V nominal lithium-ion packs will rapidly drop to less than 11V. 4 cell packs will in theory exceed the voltage rating of the Tripath chips initially, but the Yamaha chip is rated up to 16.5V. 4 cells won't drop below 12V until they're discharged, at which point the PCM (protection circuit module) should disconnect the load.
As for speakers... I keep running into dirt cheap 4x5 car speaker pairs at thrift stores and swap meets. YMMV. Be aware that these digital amps put out about the same power as "high power" car stereo head units, which could be far too much for speakers scrounged from store-bought boomboxes and radios. (One ghetto blaster I tore apart turned out to have chip amps rated at 0.1 watt RMS.)
As for batteries... 12V sealed-lead-acid is a good match; 12V NiMH or NiCd tool battery packs should also work. Lithium-ion voltages aren't so convenient; 3-cell 12V nominal lithium-ion packs will rapidly drop to less than 11V. 4 cell packs will in theory exceed the voltage rating of the Tripath chips initially, but the Yamaha chip is rated up to 16.5V. 4 cells won't drop below 12V until they're discharged, at which point the PCM (protection circuit module) should disconnect the load.
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