Satyajit Ray's signature score - theme tune of Feluda as a doorbell.

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Used hardware package/board with Arduino IDE 2.1.0 : MicroCore

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BOM

1. IC1 - ATtiny13A
2. OPT1 - PC817
3. MOD1 - PAM8403 Audio Amplifier board
4. MOD2 - TP4056 LiPo Charge/Protection board
5. D1 - IN4007
6. LED1 - Red LED 3mm
7. LED2 - Green LED 3mm
8. LED3 - Blue Led 3mm
9. R1 - 10K 0.25W
10. R2 - 1K 0.25W
11. R3 - 100K 0.25W
12. VR1 - 50K
13. C1 - 0.1uF Ceramic
14. C2 - 1uF Polar
15. SW1 - Momentary push switch
16. SPK1 - 4 Ohm 3W
17. B1 - Nokia BL 5C or any 1S LiPo
18. H1 - 7 Pin female header
19. H2, H3 - 2 Pin male header
20. IC BASE - 8 Pin
21. Strip or Perf board - 10x10 holes

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CAD: DIY Layout Creator 4.37.0 (1.0) | Homepage

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Details: Coming soon...