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More information (complete parts list, pictures,....) on Instructables: www.instructables.com/id/Make-...
Part list (affiliate links):
Aliexpress:
2x Li-Ion Battery: s.click.aliexpress.com/e/_dY2...
1x Bluetooth board: s.click.aliexpress.com/e/_dTO...
1x SPDT Switch: s.click.aliexpress.com/e/_dZR...
1x TP4056 board: s.click.aliexpress.com/e/_dWS...
1x Micro USB Breakout: s.click.aliexpress.com/e/_dTN...
1x MT3608 Boost Converter: s.click.aliexpress.com/e/_d75...
1x RGB LED: s.click.aliexpress.com/e/_dTv...
Ebay:
2x Li-Ion Battery: -
1x Bluetooth board: rover.ebay.com/rover/1/711-532...
1x SPDT Switch: rover.ebay.com/rover/1/711-532...
1x TP4056 board: rover.ebay.com/rover/1/711-532...
1x Micro USB Breakout: rover.ebay.com/rover/1/711-532...
1x MT3608 Boost Converter: rover.ebay.com/rover/1/711-532...
1x RGB LED: rover.ebay.com/rover/1/711-532...
Amazon.de:
2x Li-Ion Battery: amzn.to/2eUzhDP
1x Bluetooth board: amzn.to/2eUto9y
1x SPDT Switch: amzn.to/2eUxqyK
1x TP4056 board: amzn.to/2eUvMNO
1x Micro USB Breakout: amzn.to/2eUtzSu
1x MT3608 Boost Converter: amzn.to/2eUzFCh
1x RGB LED: amzn.to/2eUB5gb
In this project I will show you how to build a simple portable bluetooth speaker that can play its tunes up to 30 hours continuously. Most of the used components can be found for only 22$ in total which makes this a pretty low budget project.
Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod (incompetech.com)