Economical Timebase Calibrator

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Materials
Component list
R1,R6 = 680Ohm
R2 = 5kOhm 6
R3 = 10MOhm
R5 = 6kOhm 8
R7 = 220Ohm
R8 = *
Capacitors:
C1 = 100pF trimmer
C2,C4 = 33pF
C3 = 10 pF
C5 = 100pF
C6 = 1nF
C7 = 10nF
C8 = 22nF
C10 = 220µ F 25V radial
C11,C13-C18 = 100nF
C12 = 47µ F 16V radial
Semiconductors:
D1 = 1N4001
IC1 = 74HC00
IC2,IC3,IC4 = 74HC390
IC5 = 74121
IC6 = 7805
Miscellaneous:
S1 = rotary switch, 2 poles, × 6 contacts
X1 = 1MHz quartz crystal
S2,S3 = toggle switch,1× change-over contact
K2 = 2-way PCB terminal block, lead pitch 5mm
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