JCM inVentures Inc.
This page contains troubleshooting suggestions, schematics, and ideas for
Vulcan Operators guide:
PDF File 2M
Vulcan Assembly guide:
PDF File 500K
Vulcan Schematic Diagram:
Ready to start using your Vulcan or Virtual Vulcan? Here's how you get
your trainer up and running!
up your Vulcan
apply power to your VULCAN, connect a 9V battery to the battery clip on
the top right corner or plug in the 9V adapter.
You turn on the trainer by flipping the small switch on the left side
of the DIP switches DOWN ( Switch 10 ).
Flipping the switch UP turns the trainer OFF.
OUPUT connectors on your trainer can produce 8 digital
logic levels using the eight switches. The two holes in the black
connector below each switch carry the digital level for that switch.
When the switch is UP, the digital level at the hole is ON. When
the switch is DOWN , the digital level at the hole is OFF.
Inputs show the digital logic levels that exist in either of the
two holes immediately below each red light. (LED stands for Light
Emitting Diode) The two LED's on the far right are not used.
Place a wire connecting the output of the left-most
switched output into the input connector of the left-most LED as shown
in this diagram.
Now, attach the battery to your trainer and turn
on the trainer.. You should see the left red LED come on! You
have created a logic HIGH with your switch!
Turn the switch off and you should see the LED turn
off. This is a logic LOW level!
Now move the wire to the other switch outputs on the
trainer and make sure that they work too!
Move the LED input wire to the other available LED
inputs and made sure that they also work!
You might have noticed that small flashing red lamp
on your VULCAN, right below the green binding post. This is an
output whose digital level always toggles from HIGH to LOW (ON to OFF).
It is called a CLOCK and can help to control some digital circuits as we
will see later.
Let’s try it out! Hook up one end of your wire
output socket labelled "CLK: and the other end into one of your LED
logic inputs as shown in this diagram...
You should see the Logic Input flashing ON and OFF in
time with the clock lamp.
If you have a tiny screwdriver, try turning the
controls labelled ‘T low’ and ‘T high’. You will
notice that you can change the time that the digital level is OFF with
‘T low’ and the time that the digital level is HIGH with ‘T
This gives you excellent control of the speed
to the CLOCK signal..
Logic probe indicating the two logic levels of the clock output.
This ‘Logic Probe’ input is
a more sensitive indicator of logic levels. It not only shows you what
the logic levels are, but whether the signal is a true logic level!
Connect a wire from the ‘Logic Probe’ to the
‘CLK’ Clock output as shown.
You will notice that the white ‘logic probe’ lamp
will flash Green and Red
with the clock. The Green indicates a
logic LOW and the Red
indicates a logic HIGH.
Now remove the wire. When the wire is removed,
the lamp goes out. This means that there is an illegal logic
level, not a HIGH or a LOW. In our analogy to breath (
above ) this would be the equivalent of that output neither sucking or
Try connecting the Logic Probe input to the +5Volts
connector (Red). Your Probe indicator shows RED
showing the +5Volts is a logic high. Now connect the yellow probe
connector to the black ‘ground’ connector. It should change to GREEN
indicating a logic LOW.
Try connecting the ‘probe’ to each of the eight
switched outputs and see if you can change the logic levels using the
and Ground Connectors.
Powering your breadboard
Volt" and "Gnd" outputs
are a power supply for our digital circuits! Just like any electronic
device, digital circuits require energy to operate, and we can use the
energy from these connectors to power up our circuits! The TTL Family of
logic we will be using all uses 5V as supply voltage.
Your Vulcan get’s it’s energy from the 9 Volt
battery ( or adapter ) and reduces the voltage to +5Volts for our
digital circuits ( most digital logic operates at 5 volts )
You can connect the 5V and
Ground to your breadboard bus by connecting those sockets to the
horizontal BUS STRIPS on your breadboard. Once applied, the 5V and
ground may be easily brought to any chip by placing a wire from the
desired BUS STRIP to the power inputs of your chip.
Connect the BUS strips as
shown, and use a long wire attached to your logic probe to verify that a
logic HIGH exists on the
entire horizontal stip connected to the +5V output. Similarly, there
should be a logic LOW
found at the entire horizontal strip connected to the Gnd connector.