RADIO DESIGN LABS STM-2 RDL MICROPHONE PREAMPLIFIER, POWER REQUIREMENTS: 24-33 VDC, 25 MA, FEATURES: OUTPUT IS ADJUSTABLE FROM 35-65 DB GAIN. SEPARATE P

the STM 2x is a low-noise cost-effective switchable microphone preamplifier that allows an external push-button switch open collector or remote control to silently switch a microphone on and off at mic level or at line level a dynamic or condenser microphone may feed the module input the module has two balanced outputs one at mic level and one at line level gain is adjustable from 35 to 65 DB for the line level outputs the STM 2x input and each output may be connected balanced for professional equipment or unbalanced for consumer products the input is usually connected balanced during installation connection of a single jumper activates phantom voltage for powering a condenser microphone the module supplies an IEC standard p24 phantom voltage that powers all compliant microphones specified for 24 volt phantom operation and most mics accepting 48 volt phantom gain is also set during inst