Description
The ELM412 is an 8 pin oscillator circuit for driving piezo-electric elements. With the exception of one external resistor, all of the circuitry required to drive a typical piezo ‘bender’ is contained within this chip.

Features
• Low power CMOS design
• Wide supply range - 3.0 to 5.5 volt operation
• No external timing elements required
• Generates eight common piezo frequencies
• Bridged output for greater audio power
• Modified waveform for reduced harmonics

Applications
• Computer controlled tone generation
• Alarm warning signals
• Keyboard click generation
• Logic probe circuits