User:Tobychui/LTDD

The name of the LTDD is based on the structure of the LTDD itself. A LTDD include a L-Flip (Track Selector), T-Flip-Flop (On-off button), 2 D-Flip-Flop (Ram) It is not commonly use in small server as it take lots of space and time to build this, this will be only used in the server that has more then 40 people.

About the redstone circuts of flip-flops 

Structure
The LTDD structure (D-flip-Flop X2, T-Flip Flop and L-Flip)

When it is used in a Minecart Station, a LTDD can't be used without the supports of other redstone machine, like the counter and logic saving system that push the secound selection to the first memory part if the first memory part is empty.

The supports of a LTDD when it is used in a Minecart Station

The user interface of a 24-selection LTDD used in a Minecart Station.

Function
Let the user to choose the station and it is able to save the user selection till the minecart/signal is given to the LTDD output detector so next selection will be pushed forward and replce the first one.

Classification
This is classified as both redstone machine and rail system. Due to it usually being used in mass Minecart Station, this redstone machine will only appear in big SMP server's Minecart Station in Hong Kong.

How its work
The L-Flip make the output as the user selected as long-term redstone output, and the D-Flip-Flop behind is used to store the user selection and the memory at the L-Flip will be deleted.

About the locking system, due to the safety of the minecarts running on rail but not meet the turning point, the locking system can't let the second player to change the first player selection of the station(s), so do the first player himself also can't change his selection after he pressed the store button.

Designs of LTDD
The compact design of LTDD in 8 selectors

Paksang's design in 15 selectors (Buggy version, still in development)

Sources: First video of introducing the LTDD (From HK, Chinese)