This instructable introduces the venerable Spy Ear in details and my way to reverse engineer a circuit.
Why does this device deserves its own instructable?:
-You can buy a Spy Ear for a dollar!
-It can amplify sounds up to 60 dB or a factor of a 100.
This instructable introduces the venerable Spy Ear in details and my way to reverse engineer a circuit.
Why does this device deserves its own instructable?:
-You can buy a Spy Ear for a dollar!
-It can amplify sounds up to 60 dB or a factor of a 100.
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