Home / Signatrak DCC / DTX8B - Add-on LED Driver for SIGM20 DTX8B - Add-on LED Driver for SIGM20 £15.00 DTX8B - Add-on LED Driver for SIGM20 £15.00 Stock Status: In Stock Add to your Wish List Description The DTX8B is an add-on board for our SIGM20 signal controller. It drives two additional signals, or can provide drives to relays to remove track power following a red signal. Attributes Brand: Signatrak Condition: New