28129 Parallax Inc, 28129 Datasheet - Page 142

• Manufacturer Part Number: 28129
• Description: TEXT BASIC ANALOG & DIGITAL
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28129

• Style: Book
• Title: Basic Analog and Digital
• Contents: Basic Analog and Digital Text
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

As you can see, a buffer is essential to keep the voltage steady. You can use the same
voltage follower that we used in Chapters #2, #4 and #5 to buffer the output.
Place a voltage follower in between the D/A output and the LED circuit input as shown in
Figure 7-8, then run Program Listing 7.1 again.
Figure 7-7
Debug Terminal
Output for Program
Listing 7.1 with an
Unbuffered 10 k
load.