27220 Parallax Inc, 27220 Datasheet - Page 136

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

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
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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.