Temporary PA speaker repair

This speaker has been out for awhile and I had an idea to get it back and working while I find and fix the problem with the amp. The idea was to use a 12V head unit with 4x50W to power the speaker. I opened the amp and bridged the 4 amps together to increase the power and installed in the speaker.
It being 12VDC allows the speaker to become more portable than before and installing a 240VAC to 12VDC power supply allows it to be powered by the mains power. The head unit was very cheap and do not expect it to last but it does come with Bluetooth (everything is better when it’s wireless)


The interface includes:

  • 3×4 keypad
  • 3 digit 7 segment display
  • mode button on the side

Input and output

  • 3.5 mm jack with both input and output

How it works

The user keys in 3 digits to try and guess the sequence.
The device will show the user if the number is in the 3 digit sequence and if it in the right spot.
The device will only show this for a little time.

The device can be set to have a max amount of tries and/or a time limit.

Further development

  • To be programmed as keypad interface
  • wireless controller

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