122-28176 Parallax Inc, 122-28176 Datasheet - Page 177

• Manufacturer Part Number: 122-28176
• Description: GUIDE STUDENT PROCESS CONTROL
• Manufacturer: Parallax Inc

Specifications of 122-28176

• Accessory Type: Manual
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

With a 12 V supply, and R
0.04 A or 40 mA. The transistor is operating in the linear region to supply 40 mA,
developing the 4 V required.
What happens if R
4 V the op-amp requires to balance the inputs. The output of the op-amp will drive to
control the transistor until this condition is met.
The voltage at R
With a gain of 2, V
fan, the DC voltage supply of the fan may be controlled.
Additional Parts Required
(1) 2N3904 Transistor
(1) Brushless DC Fan
√
√
√
√
Modify your circuit to match Figure 5-21.
Run ModPwmFiltering.bs2.
Run StampPlot macro sic_pc_pwm_filtering.spm.
Use StampPlot to control the voltage to the fan. Note its speed by listening to it.
The fan requires at least 3.5 V and may require a small push to start rotation at
voltages slightly above 3.5 V.
L
L
is being controlled by the input to the op-amp's non-inverting input.
RL
decreases to 50 Ω? The resistor will require 80 mA to produce the
will be twice the non-inverting voltage. If R
L
being 100 Ω, the current through R
Figure 5-20
Example of High-
Current Voltage-
Regulated Drive
DO NOT BUILD
L
L
will be 4 V/100 Ω =
is replaced with the