TX-PCR1

RDL TX-PCR1 - Paging Controlled Relay

The RDL TX-PCR1 is a logic-controlled relay module designed to trigger from constant-voltage amplified audio signals (25V, 70V, or 100V). It is ideal for paging systems where speaker lines or control logic need to be automatically switched in response to audio activity.

The transformer-isolated input accepts 25V, 70V, or 100V signals, with the 25V setting also supporting 8Ω sources up to 75W. A front-panel trimmer adjusts the trigger threshold, while a second trimmer sets the release delay (3 to 25 seconds). Three LEDs indicate power, threshold detection, and relay activation.

TX-PCR1 provides both an open-collector SLAVE output and high-power DPDT relay contacts (up to 8A), suitable for switching speaker loads or triggering external devices. The SLAVE terminal can also be used as a remote input to activate the relay.

Functionality

• Automatic switching based on amplified audio signals
• Supports 25V, 70V, 100V lines and 8Ω (up to 75W)
• Adjustable trigger threshold and release delay
• LED indicators: power, threshold, triggered
• Open-collector output for controlling other modules
• DPDT relay contacts - up to 8A, 500W
• 24V DC power - ground-referenced configuration

Features

• Audio input: transformer-isolated constant-voltage speaker line
• Input levels: switch-selectable - 25V, 70V, 100V
• Detection bandwidth: 120 Hz - 7.5 kHz (-3 dB)
• Trigger threshold: adjustable -40 dB to -15 dB below selected input
• Release delay: adjustable 3 to 25 seconds
• Control output: open-collector 25 mA (SLAVE)
• Relay contacts: DPDT, 8A @ 250V AC / 30V DC, 500W
• Indicators: Power (blue), Threshold (red), Triggered (green)
• Power requirement: 24V DC @ 60 mA + SLAVE load
• Operating temperature: 0°C to 55°C

The RDL TX-PCR1 is a reliable solution for AV integrators needing automatic speaker switching or logic control triggered by paging or other amplified audio signals.