Description
The Circuitron 5122 FL-2HD Heavy Duty Alternating Grade Crossing Flasher is the heavy-duty version of Circuitron's classic alternating grade-crossing flasher — drives left-right crossbuck lights at the prototype flash rate.
What it does: Designed to be triggered by the output of any Circuitron grade-crossing detection circuit (DT-2 / DT-3). Heavy-duty output transistors raise the maximum load to 500 mA per side — recommended for boulevard crossing signals with multiple lights and for larger-scale signals (S, O, G) that draw more current. Can also be wired for continuous flashing or manual operation with a panel switch.
- Output current: 500 mA per side (alternating)
- Triggered by: Circuitron DT-2 (5202), DT-3 (5203), or any logic-level signal
- For: Boulevard / multi-light crossing signals and large-scale (O / G) crossings
- Modes: Detector-triggered, continuous, or panel-switch manual
- Circuitron SKU: 5122 (Walthers 800-5122)
Tip: For standard HO / N two-bulb crossbucks, the lower-current FL-2 is usually enough. Use FL-2HD only if you've got multiple bulbs per side or higher-current LEDs.
About Circuitron: A USA-made model-railroad electronics specialist (Maryville, Illinois) founded in the 1970s. Famous for the industry-standard Tortoise slow-motion under-table switch machine and its surface-mount cousin the SMAIL. The full range covers detection (block detectors, Opto-Sensor grade-crossing logic), automation (auto-reversers, external relays, twin-coil alternators), signal / lighting electronics (alternating flashers, ditch-light oscillators, strobe drivers), power supplies, and a complete set of Tortoise / SMAIL replacement parts plus the solderless ZipZ connection system. Most circuits work with AC, DC, or DCC track power unless specifically noted otherwise.
In stock at Oakville Model Trains Depot.