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A C-64 RELAY BOARD FOR USE WITH
TACHISTOSCOPIC SHUTTERS

Robert S. Owen, CET, Ph.D.
rsowen@sykronix.com
www.sykronix.com

The shutter t-scope requires some way to cycle the slides in the projector and to open the shutters.  The computer cannot be connected directly to these divices; it needs a buffer between the computer and the shutters (which have their own drivers which accept TTL inputs) and some way to operate the high-current switch of the slide projector.


Relay board plugs into expansion slot in the back of the C-64 computer.


The relay board uses two gates of a 74244 to run the TTL drivers of two high-speed shutters, and four gates to run four relays which operate the forward and backward switches of two slide projectors.


Schematic of the Relay Board
 
 
 


Layout of the PC Board
 
 
 


Double-sided PC Card Foils