There are two types of cards mounted in the box:

  1. ECL input card (1)
  2. pulser driver out cards (12)



1) ECL card rough sketch of the components and wiring.





























The 34 pin ECL connector will be mounted to the card. The card is secured to the box body and the front panel will have a punched slot so that card and cable can be connected. Components will be placed as close as possible. The TTL out will be sent to one of the 12 boards using a two wire connector. The layout of these connectors must be convenient. Perhaps a double row of 12 as shown above will work. If the connector heads do not allow tight packing then a 24 x 2 header with every other pin cut can be used.


2) Pullser driver boards. There are 12 boards per driver. Each combines the necessary power and trigger for an LED board.









in (in bar)


in +




B+ (charging voltage)


The ECL is converted to straight TTL and send to a driver board where it is changed to differential TTL via an RS-422 driver. The B+ is individually adjustable by a multi turn pot accessible through a hole in the front panel. The driver board circuit is shown below. A power cable will be soldered to each board. The output cable is soldered (right angle) to the board and a ribbon cable can be attached through a cut out in the front panel. The TTL to the board will be a 2 pin header mounded so that is comes vertically out of the top of the board.




















These boards are secured to the box.


Power supplies with 24,5,-5 will be mounted in the box. The supplies will have European power cords. Power will be distributed using 5 floppy drive cables. Cables will be soldered to boards and will be attached to splitters. The power will be daisy chained from one board to the next.