QTU schematics

PSU

The power supply section. This takes 15-0-15V AC in and feeds everything on the board and most things you might want on the layout too.

CPU

The central processor unit. Also includes RPC stack, serial (RS232 & RS485) interfaces and analogue inputs.

I/O

The 32 input pins and 24 outputs. Also the optional tortoise/conrad turnout motor drive circuits.

Throttle

The circuit for one of the four track output drivers. This includes current limiter, current measurement and feedback sampling.

Track feed

How four copies of the throttle circuit connect to the rest of the circuit, including the track power feed connector.