The IEPE1 is designed to connect passive piezo sensors, used in most hydrophones, to constant-current bias supplies, typically used in data acquisition devices. Integrated Electronics Piezo-Electric power (IEPE) is a constant current that can be modulated through a coaxial cable, alleviating the need for extra power conductors and minimizing the size, bulk, and cost of cable. Proprietary names for this include ICP, CCLD and others.

A constant current of 2 to 20mA is required. 24V is the standard compliance voltage for IEPE, though this amp will work with as little as 18V at 2mA. It will also work when powered with one leg of phantom power from a microphone preamp (typically pin 2 of XLR jack).

NOTE: This amplifier is not waterproof. Care should be taken to keep connectors and electrical components as dry as possible, especially when working in corrosive environments such as seawater or chlorinated water.

Equivalent Input Noise -122 dBV 10nF input shunt, A-weighted 20Hz – 22kHz
Total Broadband Output Noise -89 dBV 10nF input shunt, Unweighted 10Hz – 90kHz
Bandwidth 10Hz - 90 kHz +0/-0.5 dB
4Hz - 170 kHz +0/-3 dB
THD+N <0.02% @1kHz, -10dBV output
Max output >5dBV RMS @1kHz, 1% THD
Supply Current 2-20mA IEPE constant current.
Gain 26dB
Z in 10 MΩ
Physical Ø19.7mm x 66.8mm, 42g.

Tested with 24V – 4mA constant current supply except where noted.