these are component that bought from Nixie Electronics in Jalan Pasar, KL
we bought 2 set of these component and it just cost me about RM15. They are quite cheap.
this circuit is working and can be detect haertbeats.
it
is better to use piezo than mic because piezo detect vibration and mic
detect noise in the air. we will upload the output result of my circuit
in my next entry.
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