ABSTRACT
In addition to turning sounds on and off , there are many occasions when we want to make something LOUDER (see the Second Law of the Avant-Garde). Loudness comes in diff erent fl avors, and a little experimenting with the CD4049 Hex Inverter demonstrates several of them. Th is is yet another example of a digital logic chip being “misused” for analog purposes. Its internal confi guration and pinout are shown in fi gure 23.1. Note that the 4049 is a rare exception to the general rule of corner pins for power hookup in CMOS chips (as in the 74C14 Hex Schmitt Trigger, the 4093 NAND Gate, and the 4040 Divider circuit we used in previous chapters). If you are at all dyslexic, now is the time to hold onto your hat with both hands: although the ground connects to pin 8 as expected, + volts connects to pin 1. Th e NC by pins 13 and 16 indicates “no connection.” Note also that the 4049 inverters face the opposite direction than those in the 74C14. IMPORTANT: do not substitute the 74C14 Hex Schmitt Trigger for the 4049 in the examples in this chapter-the 74C14 is an inverter, but has a diff erent internal circuit design that won’t work properly in these confi gurations (if I may wax technical, the 4049 omits the Schmitt Trigger circuit essential to making our oscillators snappy, but incompatible with the designs in this chapter).
