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U4 is a 4001 device, and is part of the classic 4000 series of CMOS logic. Many companies
make this device and as such the device ends up having all sorts of names. eg. CD4001,
MC14001, 4001BE. All types should work but try to avoid the 4001UBE, this is an older
device and is very prone to static damage. Either way a good quality IC socket is
recommended for this chip. You’ll need a 14-pin type.
The LEDs are standard 5mm round types. You can chose either flat topped or domed top. Flat
tops tend to look better, although the viewing angle is not normally as good. The LED
labelled OUT is a bicolour LED. I like red/green ones the best, although other colours are
available. Try to get the three single colour LEDs from the same range of LEDs, that is, the
same manufacturer and type. You can choose from different colours in the same range. The
three single colour LEDs are driven from the same current source, and by choosing the from
the same range you should get the same brightness from each one. I have used red, orange,
and green, for no particular reason other than to look like a traffic light!!
There are five switches on this board. The GATE and RESET switches are push switches.
These are sometimes designated SPNO (single pole, normally open). Farnell part number:
146-244. You can use momentary toggle types if you prefer. The other three switches are
normal SPDT toggle types. Get good quality ones. Apem and C&K make good ones. Farnell
part number: 147-772. There will be more detail on how to wire the switches to the board
later on in this document.
Parts List
The components are grouped into values, the order of the component names is of no particular
consequence. Please read the above section for more details about the parts used in this
module.
A quick note on European part descriptions. R is shorthand for ohm. K is shorthand for kilo-
ohm. For capacitors: 1uF = 1000nF. To prevent loss of the small ‘.’as the decimal point, a
convention of inserting the unit in its place is used. eg. 4R7 is a 4.7 ohm, 4K7 is a 4700 ohm
resistor, 4n7 is a 4.7 nF capacitor.
Resistors
Resistors 1/4W, 5% or better.
100K R21, R24, R19, R33, R32, R23, R38, R43, R34, R22,
R31, R14, R8, R15, R16
100R R4, R7
10K R28, R25, R3, R9
10R R29, R30
120K R13
18K R17
1K R18, R6
1M R35, R46, R10
22R R40
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