Connector adapter for Atlas model railroad signals

Breakout Connector Adapter for Atlas Model Railroad Signals

Several model railroad signals made by Atlas have a 4-pin micro connector, sometimes called a 'JST' connector, attached to the signal wires.

This mini connector makes connection to the Atlas signal control circuit simple, but what if you want to use a different control circuit?

These breakout connector adapters 'break out' the Atlas signal connections, giving you access to the signal lights without cutting off the connector and having to solder those tiny wires.

Single breakout for individual single-head signals
Dual breakout for a dual-head signal or two single-head signals

BOA-1 has one of the above circuits, BOA-2 has two indentical circuits on board.

These breakout adapters include a 1,800 ohm resistor in series with the signal common wire.
Atlas signals do not have resistors built in.

Choose how you will connect your control wires.

When the wires from your Atlas signal are too short for convenient access, the Atlas signal extension cable gives you a bit more reach. Male-to-female 4-pin JST connectors, 7 inches (18 cm) length.

Use one per signal head.