Data Sheet

LABCENTER ELECTRONICS LTD.
222
Select the OK button to accept the changes.
For this circuit only one generator is needed, but there is no limit on the number
which may be placed.
Probes
Having defined the input to our circuit using a generator, we must now place probes at the
points we wish to monitor. We are obviously interested in the output, and the input after it has
been biased is also a useful point to probe. If needs be, more probes can always be added at
key points and the simulation repeated.
To place a probe, click left on the Voltage Probe icon (ensure you have not selected a current
probe by accident - we shall come to these later). Probes can be placed onto wires, or placed
and then wired, in the same manner as generators. Move the mouse over to the edit window, to
the left of U1 pin 3, and click left to place the probe on the wire joining pin 3 to R1 and R2. Be
sure to place the probe on the wire, as it cannot be placed on the pin itself. Notice the name it
acquires is the name of the nearest device to which it is connected, with the pin name in
brackets. Now place the second probe by clicking left just to the left of the OUT terminal, on the
wire between the junction dot and the terminal pin.