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ZD Meter

Measuring Z Voltages of Z Diodes ≤ 100 V

ZD Meter
ZD Meter
Every electronics engineer collects old components in some drawer, because they “can be used again sometimes.” However, with time, illegible or incomprehensible inscriptions, it is not always clear what these components can do. With Zener diodes, there is also the question: “Are they still okay?” With the help of this ZD Meter, these ambiguities can be eliminated.
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Materials

Component list

Component List

Resistors:

R1 = 68 k, 2 W

R2, R3 = 560 Ω

 

Capacitor:

C1 = 22 µ / 200 V, electrolytic

 

Semiconductors:

D1..D4 = 1N4004

D5..D7 = 33 V Z diode, 1.3 W

LED1 = LED, yellow, 5 mm

T1 = NPN transistor, VCE ≥ 200 V, e.g. TIP50

IC1 = TL431

 

Miscellaneous:

S1, S2 = 1 A / 230 VAC SP switch

S3 = 1 A / 230 VAC push button

M1 = DVM module 3 or 2.5 digits, range 100 V

Tr1 = 90 V sec. transformer (see text)

Heat sink for T1

2 sockets, 4 mm

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