27297 Parallax Inc, 27297 Datasheet - Page 136

• Manufacturer Part Number: 27297
• Description: KIT STAMPWORKS WITH BS2-IC
• Manufacturer: Parallax Inc

Specifications of 27297

• Lead Free Status: Contains lead
• Product: Microcontroller Accessories
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Page 126 · StampWorks
EXPERIMENT #22: ANALOG OUTPUT WITH PWM
This experiment demonstrates the creation of a stable analog output voltage using
PWM and an off-the-shelf op-amp.
Look It Up: PBASIC Elements to Know
•
PWM
Building the Circuit
Note: The 10 kΩ resistor is marked: brown-black-orange.
The LM358 requires at least 6.5 volts on its Vcc pin (8) to provide a five-volt output
from PWM. By using the PDB’s Vin connection (near the RS-232 DCE port) and a 12-
volt power supply, this requirement is satisfied.