User manual OMNICRON ELECTRONICS CONFERENCE MICROPHONE (PZ-2LA)

[. . . ] PZ-2LA DESCRIPTION The Omnicron PZ-2LA Pressure Zone Microphone® is designed for meeting and conference recording. So that it does not draw attention, it looks like a switch, not a microphone. [. . . ] A balanced audio output is available at OUTPUT screw terminals # 2 and # 3. The recommended minimum load impedance is 1000 ohms. If the microphone is mounted to a grounded enclosure, ground loops could occur that would cause hum. If hum is present when the PZ-2LA housing is connected to ground, remove the resistor labeled GND LIFT on the printed circuit board (see schematic below). The microphone is factory set to handle sound levels up to 110 dB without excessive distortion. If the sound at the mic will exceed 110 dB, increase the value of the plug-in resistor (labeled Gain) for more headroom. To increase the gain, replacing the 1K ohm resistor with a 390 ohm resistor will provide 12 dB more gain with a corresponding decrease in headroom. CUSTOM INSTALLATION After removing the plastic housing, the microphone can be installed in a ceiling or wall using a standard electrical outlet box. Internal connections to the PZ-2LA electronics are as follows: 1. Power from the 12VDC AC power adapter connects to INPUT terminals # 1 & # 2. Audio output connections are made at OUTPUT terminals # 2 and # 3. If the audio output is connected to equipment that has a balanced input circuit with a separate ground connection, the ground connects to OUTPUT terminal # 1. INSTALLATION The PZ-2LA comes pre-wired for use with recorders that have a 3. 5mm "AUX" (auxiliary) input jack. It is supplied with a 6' cable that plugs into a supplied junction box. [. . . ] The PZM® microphone used in the PZ-2LA is manufactured by Crown International, Inc. 1K PZ-2LA Schematic diagram C OMNICRON ELECTRONICS www. omnicronelectronics. com 02020098 581 Liberty Highway l P. O. Box 623 l Putnam, CT 06260-0623 l ((860) 928-0377 l FAX (860) 928-6477 [. . . ]