DAP1A Automatic Semaphore Signal Controller

The BLOCKsignalling DAP1A is an automatic semaphore signal controller designed to bring realistic train detection and signal operation to your model railway. Using an infra-red sensor mounted beneath the track, the module detects passing trains and automatically changes the connected Dapol semaphore signal from Danger to Clear. Once the train has passed, the signal remains at Clear for a user-defined period before returning to Danger, simulating authentic railway operation without manual input. The module also includes outputs for control panel LEDs, allowing you to monitor signal status remotely. The DAP1A is fully programmable, with adjustable timing, detection sensitivity, and release delay. Settings are configured using a simple push button and LED feedback system, making it easy to tailor performance to your layout. Key Features Automatically operates a Dapol semaphore signal based on train detection. Infra-red sensor detects trains passing above the track. Adjustable delay before the signal returns to Danger. Configurable release time to handle longer trains with multiple carriages. Built-in programming system using push button and LED feedback. Additional outputs for red and green control panel LEDs. Adjustable sensor sensitivity for different environments and layouts. Remembers signal state even after power is switched off. Compact design for easy installation beneath the layout. Electrical Requirements 16V AC power supply required. Dedicated output terminals provide power directly to the connected signal. Additional outputs supply approximately 12V for LED indication (series resistor required). Careful wiring is essential to prevent damage to the module. Documentation & Support For detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual: Product Instruction Manual