Larson Davis Microphone Power Supply Offers Enhanced Battery Life

February 8, 2007, Depew, NY, USA – Larson Davis, a division of PCB Piezotronics, Inc., has introduced the addition of Model 2221 power supply to its growing line of acoustic accessories. Model 2221 is a single-channel power supply, designed for use with traditional, externally polarized condenser microphones. The 2221 has the ability to supply 0 Volt or a 200V polarization voltage. User selectable features include a flat (Z), A, or C-weighting filters and a 0, 20 or 40 dB gain switch. One of it features is the enhanced battery life, which can last up to 40 hours on a set of AA batteries. This battery life can be approximately doubled when using e-Lithium batteries. The unit can also be run with on-line power via supplied adaptor. The product is a perfect compliment to data recorders, data loggers and frequency analyzers.

Larson Davis carries a full compliment of the prepolarized condenser microphone and preamplifiers. Powered by a 2-20 mA signal conditioner and standard coaxial cables, these modern designs have become extremely popular due to its significant savings in power supplies and cabling, and “ease of use” characteristics. The prepolarized designs can be used with the same constant current source required for ICPâ accelerometers. This affords the user the luxury of using the microphones along side the accelerometers, in the same test, minimizing set-up time. Besides the modern prepolarized designs, Larson Davis also offers the traditional externally polarized microphones that run off of a 200V power supply.