Autoranging Capacitance Meter
wide-range, PIC-controlled
Materials
Gerber file
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Extra info / Update
Component list
R1 = 120?
R2 = 5k?6
R3 = 5M?6
R4 = 1k?
R5 = 39k?
R6 = 10k?
R7 = 470? 1W (see text)
P1 = 1M? 10-turn multiturn preset, vertical mounting
P2 = 1k? 10-turn multiturn preset, vertical mounting
P3 = 100? 10-turn multiturn preset, vertical mounting
P4 = 22k?
Capacitors:
C1 = 47nF
C2,C7 = 100nF
C3,C4 = 4pF7
C5,C6 = 330nF
Semiconductors:
D1 = zener diode 5V6 1W
D2,D3 = 1N4148
IC1 = TLC555 (Texas Instruments), 3V555 or TS555 (Thomson)
IC2 = PIC16F84A-20/P, programmed, order code 020144-41
IC3 = 78L05
T1 = BC559B
Miscellaneous:
BT1 = 9V PP3 (6F22) battery with clip-on connector
JP1 = 2-way pinheader with jumper
K1 = two 7-way socket strips, lead pitch 0.1 inch
K2 = 16-way boxheader
K3 = PCB solder terminals
S1 = on/off switch
X1 = 20MHz quartz crystal
LCD display, 2x16 characters, e.g., Trimods 1536, Farnell # 142-554
Length of 16-way flat cable with IDC socket
Enclosure: e.g., Pactec HPS and HPLS series, type HPS-9VB (28x53x91x146 mm), Farnell # 736-351, see also www.pactecenclosures.com
PCB, order code 020144-1
Disk, source code and hex files, order code 020144-11 or Free Download
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