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Intercom Amplifier



The ST-IC1 is the ideal choice where an intercom system is to be installed, or where an amplifier is needed to bring a mic level up to a 1 W speaker level with optional muting capability.

The ST-IC1 has one input, one output and two muting control terminals.

The input accepts a dynamic mic, a condenser mic (a phantom supply input terminal is provided to power condenser mics), an 8 Ω speaker or a 45 Ω speaker. The gain range of the module is sufficient to accommodate this wide variety of source levels.

The output is ground-referenced, and drives more than 1 watt RMS into an 8 Ω load. The output circuit can be connected to any load impedance of 4 Ω or greater.

PS24AS power supply sold separately.

Main Features:
• Intercom Electronics
• Intercom with Push-to-Talk
• Mic or Speaker Input
• 8 Ω or 45 Ω Speakers
• Bidirectional Communication Option


• Frequency Response:300 Hz to 4 kHz (+/- 2 dB, filtered for voice band intelligibility)
• Gain:Off to 70 dB (adjustable)
• Input level for 1 W RMS output:-60 dBu (8 Ω source); -55 dBu (600 Ω source)
• THD+N:< 1% (1 kHz, referred to 1 W @ 50 dB gain)
• Residual Noise (below 1 W):< 75 dB (60 dB gain setting, unmuted)
• Operating Output Power:1 W RMS
• Maximum Output Power:1.5 W RMS (before clipping)
• Mute Attenuation:> 115 dB (1 kHz) 
Mute Switching Type:Solid-State, no relay contacts used
• Mute Release Delay:15 ms
• Power Requirement:GROUND-REFERENCED, 24 Vdc @ 175 mA
• Ambient Operating Environment:0° C to 50° C

RDL ST-IC1 Figure 1

RDL ST-IC1 Figure 2


RDL ST-IC1 Figure 3 

List Price: $213.46
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