- Published in issue 1/2020 on page 18
Capaci-Meter
with two-digit Dekatron-style LED display
The Capaci-Meter is a capacitance meter with a retro-style ‘Dekatron’-type arrangement of LEDs to represent two digits. It is not designed to be an accurate measurement instrument. Instead it is aimed at establishing if a capacitor is close to the desired value, especially when it is difficult to read the values printed on the capacitor.
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
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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