28128 Parallax Inc, 28128 Datasheet - Page 125

• Manufacturer Part Number: 28128
• Description: KIT BASIC ANALOG/DIGI PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28128

• Accessory Type: ADC, DAC
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Remember that you can turn the sound (noise, racket, whatever you want to call it by
now) off by shorting pin 5 on the 555 timer to Vss. When you want the sound back on,
just disconnect the wire from the Vss terminal again.
Modify the test circuit by replacing pot A with two 2 k
the 10 µF capacitor with the 0.1 µF capacitor from your parts kit. Figure 6-9 shows how
the circuit should look when the changes to the circuit have been made.
resistors in series, and replace
Figure 6-8
Debug Output for
Program Listing 6.2