- You can buy a Spy Ear for a dollar! (or less)- It can amplify sounds up to 60 dB or a factor of a 100.
- It has a self limiting property and adjusts the gain so that the amplified signal volume is always just right.
- It runs of two LR44 1.5 volt button cell alkaline battery, so it's perfect for portable projects.
- Many of today's projects, such as in robotics, require analogue front end for sensing the environment and the Spy Ear circuit is just right to fill in as a multi-purpose front end amplifier.
- It is simple enough to reverse engineer.
So, the Spy Ear is a fantastic cheap, small and rugged circuit for modding and hacking! (more)
