Doepfer MTC64 Relay Board - Manual (Page 3)

The MTC Relay Board is an expansion board for the universal MIDI control
electronics MTC64. It has available 16 relays. Each relay is able to switch a max.
voltage of 100V and a max. current of 1A. For example lamps, magnets, motors,
laser beams but even audio signals can be switched on/off by Midi note on/off or
program change messages.
These are the most important features:
• 16 relays (reed relays)
• max. switching voltage 100V
• max. switching current 1A for each relay
• relay connections via screw terminals
• 16 LED controls that indicate the relay states
• up to four MTC relay boards can be connected to one MTC64 main board
• connection between MTC relay boards and MTC64 main board is established via
one 10 pin ribbon cable leading from the main board to all relay boards, and a 16
pin ribbon cable between main board and relay board (one for each relay board).
• the 16 pin ribbon cable is included with the relay board.
• the 10 pin ribbon cable is included only if the relay board(s) is/are ordered
together with the MTC64 main board. Otherwise the 10 pin ribbon cable has to be
ordered separately. In this case please specify how many relay boards have to be
connected to the main board (because of the lenght and number of female
connectors of the 10 pin ribbon cable)
• cables for the wiring of the relay contacts are not included
• If an older MTC64 main board is used the integrated circuits labelled CD4094
have to be replaced by 74HC4094 (valid only for old MTC64 main boards
manufactured before January 2005, in case of orders of main boards in
combination with relay boards the main boards are already equipped with
74HC4094)
• The sketch on page 4 shows the wiring of the MTC Relay Board(s) with the
MTC64 main board