Miniature Mantra Audio Circuit

I need a working bench-top prototype of a circular audio board no larger than 22 mm in diameter and 4.5 mm thick. When the 3.7 V rechargeable coin cell (LIR1240 or LIR1254) is installed and the micro tactile switch is pressed, the board should play a single 15-second mantra(on loop) through a 10 mm dynamic earphone driver. A second press during playback must halt the sound immediately rather than restart or ignore the input.

For this first build, please load any short sample mantra you have handy; I mainly want to see the electronics, firmware, and acoustic chain proven. A modern low-voltage voice IC is expected so the circuit can run directly from the Li-ion coin cell without a boost stage. Battery charging arrangements can wait for a later revision, so the prototype only needs to power up from the coin cell and run reliably on the bench.

What I am expecting in 7–10 days
• Schematic, BOM, and PCB layout files (Gerber or similar) that meet the 22 mm × 4.5 mm envelope
• One assembled and fully tested prototype that performs the play/stop behaviour exactly as described
• Short video or live call demonstration confirming successful playback, clean audio, and correct button response
• Shipping of the physical unit to me once verified

Handy tools/components you might already use—PIC/AVR or dedicated voice IC, JLCPCB or OSH-Park fabrication, reflow or hand-assembly—are fine as long as they fit the size, voltage, and output specs.

If a particular component has a long lead time, let me know immediately so we can agree on a substitute.