The Iowa Scaled Engineering Block Signal Basic is complete solution for adding basic ABS block signals at a track block boundary. It is fully compatible with the Modular Signal System (MSS) standards, and provides what the MSS standard calls a "cascade."  It's perfect for adding simple signaling to both home layouts and modules!

Note:  This version includes only one ATOM DCC block detector, and is intended for use on home or club layout use.  For use on modules, we recommend the SimpleSig MSS Block Signal Basic for Modules, which includes two ATOM DCC block detectors.  To better understand whether you need one or two detectors, see this question in the FAQ.

Features

• Complete ABS-style signaling solution for a block boundary
• Compatible with Modular Signal System standards 1.x, 2.x, and (proposed) 3.x
• Controls one LED block signal head in each direction
• Powered from 8V to 24V DC, AC, or DCC power.
• Compatible with both common anode (positive) and common cathode (negative) signals
• Realistic signal fading during changes for both tri-light and searchlight style signals
• Supports both always-on signals and approach lighting
• Configurable for three or four indication signaling
• Simple plug-and-play compatibility with most Atlas HO and N scale signals
• Includes control board, one ATOM DCC block detector, one TrainSpotter optical detector, and 8 ft connecting cables
  

Specifications

Size: 3.25"(L) x 3.0"(W) x 0.5"(H)
Power: 5 to 24 volts DC, AC, or DCC at 50mA (typical)
MSS Standard Compatibility: 1.x, 2.x, and (proposed) 3.x

Documents

The complete Kicad design files are available on GitHub.

User Manual

Schematic (v1.1)