If you want to get some sound out of your project but have a tight space budget, this is a good way to do it. This 0.5W, 8Ohm speaker is only 40mm in diameter and just over 4mm thick, the same kind you might find in one of those “talking greeting cards”.

Single Female/Male Pin Header Case (2.54 - 40 Pins)
Linear Voltage Regulator 5V 1A (L7805CV)
2N3904 NPN Transistor (2pcs)
Single Male/Male Pin Header (2.54 - 40 Pins)
CR2032 CR2025 Coin Battery Socket 






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