Large Piezo Alarm - 3kHz - COM-13940 - SparkFun Electronics
Amazon.com: Frequency to Voltage Conversion Module 0-3KHz to 0-10V F/V Conversion Module Digital to Analog Converter Module(0-3kHZ to 0-10V) : Electronics
3kHz ES Circular Horn for Celestion CDX1-1425 – Joseph Crowe
35mm DIN Small Frequency Transmitter 0-100kHz 1kHz 2kHz 3kHz 5kHz Input with 100V 200V 50V 20V 4-20mA 0-10V Output DC12V DC24V Power Supply - China Frequency Transducer, Frequency Transmitter | Made-in-China.com
UCC28051: 3kHz ripple in AC line current - Power management forum - Power management - TI E2E support forums