Just press the PLAY button from the cassette player, then place the headphone bud on the cassette player head. You may also want to press the cassette player PAUSE button, in order to spare the pinch roller.
Now, you have a power speakers system for your mobile device.
No tools or tinkering necessary.
:o)
System design:
3D Printing AVR Arduino Art Audio Automation BeagleBone Bluetooth Cameras Clock Drones Environment Hardware IoT LED Medical Music Radio Raspberry Pi Remote Control Robotics Rockets Satellites Science Security Software Virtual Reality Wearables
I love it, especially since the tune was instantly recognisable (obviously stock audio but still)
https://www.youtube.com/watch?v=FlkbaAxcdMw
-gnif