Figure 3 Two LED drivers operating in series or parallel let you boost zener voltage or current. Figure 4 shows an assembled zener-diode-tester circuit. The zener diode under test is On Semiconductor ...

We always enjoy [w2aew’s] videos, and his latest on zener diodes is no exception. In it, he asserts that all Zener diodes are not created equal. Why? You’ll have to watch the video belo… ...

This may be as high as 5 mA, especially with lower-cost, non-temperature-compensated diodes (Fig. 2). 2. Zener diodes typically require a more than a few milliamps to reach “knee” voltage Vz.