ZD Meter
Measuring Z Voltages of Z Diodes ≤ 100 V

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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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