Converting a vintage suitcase into a groovy Bluetooth Boomcase. via instructables
The Boomcase is a vintage suitcase converted into a boomcase,
It has two woofers and two tweeters. The case is powered by one lead acid battery.
The boomcase can be charged via an 230V power supply. The amplifier delivers 15 watts of power per channel, and has a connector for an external sub-woofer (30W). You can easily take this case to the park or to the beach or just let it play at your home. This is my first instructable so I hope you like it.
– Switched mode power supply: http://www.conrad.be/ce/nl/product/511827/TDK-Lamb…
– Bluetooth module: http://www.benl.ebay.be/itm/Bluetooth-BLK-MD-SPK-B…
– Usual electronic components (resistors / capacitors / connectors / …): found at a local electronics store.
– Lead acid battery: bought at local flea market.
– Lead acid batterycharger: found at a local electronics store.
– Heatsink: recovered from old Acoustimass speaker.
– PCB: http://www.elecrow.com/services-c-73.html
– Soldering iron
– Tweezers (for the SMD components)
– Wire Cutters/Strippers
– Milling machine
Step 1: Designing the PCB
First I designed the PCB,
I did this step first because I know I will have to wait for at least 3 weeks for the PCB’s to arrive.
I started with a schematic that i found on the internet:
This scheme will never work on a 12V battery!
The voltage required on pin 7 (standby pin) of the TDA7377, is 5V in this configuration the voltage on the standby pin would be 1,9V and then the amplifier would never get out standby.
I replaced the resistor of 22K ohm with one of 10K ohm and the capacitor of 1µF with one of 10µF.
I altered it so I could make an extra sub-woofer channel:
I made it a mono speaker: joining the right and left channel together.
This joined signal I took as input for my sub-woofer pre-amp.
I designed the PCB with the Eagle cadsoft software but I lost the .BRD file so I can only upload the .SCH file. (truly sorry).
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.