CHAPTER 5 ■ NUMBERS AND UNITSFor example: 223 represents 22000, 501 represents 500, 475 represents 4700000. Any guesses as to what
100 represents? 10. (So, they usually just print 10.)
Converting Colors to Numbers
Not only are many parts small, but some are cylindrical too (see Figure 5-7). To overcome that printing
challenge, color stripes indicate value (see Table 5-4).
Table 5-3. Missing Units
Type Units
Battery volts (V)
Large capacitor microfarads (mF)
Small capacitor picofarads (pF)
Crystal megahertz (MHz)
Inductor henrys (H)
Oscillator megahertz (MHz)
Potentiometer ohms (W)
Resistor ohms (W)
Figure 5-6. Not much room for a label (104 represents 100000 pF)
Expanding from Three Digits
Here’s a little trick: On some parts, not only are the units missing, but only three digits are printed (see Figure 5-6).
The last digit indicates the number of zeros to tag onto the end of the first two digits.