My Type 2 Clock/Terminator/Hub is an updated design based on the SJ Research Type 2 Clock with the following differences:
Note: the unit is powered from +12V DC.
This unit can be all that you need to connect up an Econet network by providing the Clock, Termination and sockets for up to 5 Stations. It can be extended using the second Clock output.
The clock rate is set by selecting a MARK and PERIOD each of which is the sum of all the enabled switches in the bank. Acorn recommend a safe value for Period of 5µS and for Mark 1µS.
Note that if the same duration MARK and PERIOD switches are selected there is a timing issue which stops it working, the simple solution is to add an additional 0.125µS to the MARK. This is fixed by the addition of R7/C8 on later boards, these can be quite easily added to V1.0 boards with a track cut if required.
The PCB fits neatly in a Hammond enclosure:
I also have a avaliable a Eurocard version of the Clock.
Schematic
Bill Of Materials
Box Drilling