A shorter version of the AMD4, the ASD4 is a drop-in for the Atlas GP7, GP9, GP30, and GP35. It has two LED's (one on the front, and one on the back), and it supports to extra functions by way of soldered on leads.
The ASD4 features the TCS exclusive auto-adjusting BEMF.
DCC Decoder Harness -- T-5"-21 JST 9-Pin to NEM21 Socket, 5" 12.7cm Wires
DCC Decoder Harness -- T-5"R NMRA 8-Pin Plug Rotated 180 Degrees, 5" 12.7cm Wires T Series Harnes
KAT24 T1 4-Function Decoder w/Built-In Keep Alive Device -- 1.315 x 0.65" 33.4 x 16.51mm
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