Aiphone PC-359B Call Holding Circuit Board for NEM, NDR, NDRM

Convert a simple speaker and normally-open call button into a fully latched remote station with the Aiphone PC-359B call holding circuit board. Designed for the NEM Lamp Memory system (also compatible with NDR/NDRM lines), this compact call holding board ensures a call is retained until answered, improving response tracking for intercom, access control and security monitoring setups. The PC-359B supports the NEM system impedance of 20 ohms, or 8 ohms when used with the LT-1 matching transformer, and installs discreetly behind a speaker or call button using just 2-conductor shielded wiring for tidy, low-voltage runs. Ideal for retrofits or new builds where a standard sub station is impractical, the board helps streamline surveillance and site communication by integrating speaker-based entry points into your existing intercom and monitoring architecture. Use the Aiphone PC-359B to simplify installations, reduce cabling, and maintain reliable call latching across your security infrastructure — order now to upgrade your intercom and access control deployments.

• Adds reliable latching call hold so speaker + N/O call button behave like a remote sub station
• Enables retrofitting of speaker-based entry points into existing NEM/NDR/NDRM intercom systems
• Compact board conceals behind a speaker or call button for clean, vandal-resistant installations
• Supports 20 ohm impedance (or 8 ohm with LT-1 transformer) to match site audio hardware
• Simple 2-conductor shielded wiring reduces installation time and integration complexity with security systems