Capaci-Meter
with two-digit Dekatron-style LED display
Components
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Component list
Component List
[Illustration 191043-030-94]
[Illustration 191043-029-94]
Resistors (all 1%, 0.25W)
R1=1.5MΩ
R2=150kΩ
R3,R7,R10=13kΩ
R3',R8,R9,R12=1kΩ
R4=560Ω
R5,R6=470Ω
R11=130kΩ
R1',R2',R4'= Not fitted (optional to adjust accuracy)
Capacitors
C1,C2 = 10µF, 10V
C3,C4,C5 = 100nF
C6 = 4.7nF, 1% or 5%
C7 = 47pF
C8 = 10nF
Semiconductors
D1,D2,D3,D4 = 1N4148
Q1 = 2N7000
U1,U2 = CD4017BE
U3 = NE556
U4 = 78L05
LED1,LED11 = green LED, 5mm, low current or high brightness
LED2-LED10, LED12-LED20 = 18× red LED, 5mm, low current or high brightness
Miscellaneous
J1,J2,LK1,LK2,LK3,LK4 = 2-pin pinheader, 2.54mm pitch
J3 = PP3 9V-battery clip
J4 = Connections to test capacitor
JP1 = Jumper for range selection
2× 16-pin DIL socket, 7.62mm width for U1 & U2
1× 14-pin DIL socket, 7.62mm width for U3
Printed circuit board (PCB) 191043-1
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