Radio Design Labs STM 2X Switchable Low-Noise Microphone Preamp

Radio Design Labs STM-2X
Switchable Low-Noise Microphone Preamp

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Radio Design Labs STM-2X

The STM-2X is the ideal choice in many installations where a microphone preamplifier is required, and is the ideal choice where either a toggle-type switch or push-to-talk switch is to be provided for microphone control, particularly if condenser microphones are used.

The STM-2X features a balanced mic-level input, and both a line-level and mic-level output. The input and each output may be wired balanced or unbalanced. A 25-turn trimming potentiometer is provided for precise level adjustment whether the module is being used as a mic-level switch, or as a switched mic-to-line preamplifier. A phantom voltage input is provided for use with condenser mics. The 24 Vdc power source is typically used as the phantom supply, requiring no other external phantom supply. These features permit the STM-2X to be used as a manually switched mic preamp, or as a mic-level remote switch for dynamic or condenser microphones. The mic-level output from the STM-2X may be safely connected to other equipment mic inputs which produce phantom voltage.

It is frequently necessary to provide user accessible switching for condenser microphones. This may include a simple mic on/off switch, push-to-talk or a ‘cough’ button switch. Conventional methods of either shorting or opening the microphone line results in loud audible ‘pops’ due to the phantom voltage on the mic line. For these applications, the STM-2X provides quiet, solid state ‘soft-switching’ with no disruption to the phantom voltage. The output of the STM-2X is turned ‘on’ by grounding the control terminal, either by a switch or by any of the SLAVE terminals from other RDL products.

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