Pvelectronics SN-18 Guía de configuración

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

Assembly Instructions

And

User Guide

Nixie Clock Type

‘SN-18’

Software version: V1.0

PCB Revision: 13 July 10

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

1 INTRODUCTION

1 1 About the clock

Nixie lo k type ‘SN18’ is a Single Digit Nixie Tube Clo k.

It an be used with two types of tube: IN-18 with a digit height of

40mm or type IN-8 with a digit height of 18mm. These tubes

originated in the USSR.

How can the clock display the time with only a single digit?

The lo k flashes up the time in the sequen e HHMM, with

appropriate pauses between ea h digit,and a longer pause between

ea h time y le ie. H.H...S.S.....H.H...S.S.... and so on. It is really

very intuitive, and on e you 'get it', it is really obvious and simple

to read the time!

1 2 Clock Features

Nixie lo k type ‘SN18’ has the following features:

• For IN-18 or IN-8 Nixie tube

• 12 or 24 hour time display

• Adjustable night blanking period, with adjustable override period

• Alarm, with snooze

• Customisable snooze period (6,9,12 or 15 minutes)

• Crystal timebase, with software alibration

• Optional WWVB or DCF77 syn hronization

• Software shutdown of HV for optimum WWVB or DCF seek

• Auto night-syn hronisation for optimum signal re eption (user-

onfigurable)

• Blue or white LED underlighting of Nixie tube, software onfigurable

for following night-blanking or not

• Multifun tional LED for se onds:

o No WWVB or DCF77 syn in the last 24 hours: flashes red

o Valid WWVB or DCF77 syn in the last 24 hours: flashes green

o Currently a quiring a WWVB or DCF77 frame: flashes red/green

• Time ba kup for ~1 hour in ase of power outages

• AM / PM indi ator LED

• 4 display modes in luding 2 fade modes (slow and fast)

• All user settings and preferen es stored to flash memory

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

1 3 Safety

DANGER: The lo k p b in ludes a swit hed-mode voltage booster

ir uit. This generates nominally 170 Volts DC, but is apable of

generating up to 300 Volts before adjustment. Assembly may only be

undertaken by individuals who are suitably qualified and experien ed in

ele troni s assembly, and are familiar with safe pro edures for working

with high voltages. If in doubt, refer to a suitably qualified engineer

before pro eeding.

The voltages generated by this circuit can give a potentially

LETHAL ELECTRIC SHOCK

DISCLAIMER: This produ t is supplied as a kit of parts, intended only for

suitably qualified ele troni engineers, who are suitably qualified and

experien ed in ele troni s assembly, and are familiar with safe

pro edures for working with high voltages. The supplier, his agents or

asso iates a ept no liability for any damage, injury or death arising from

the use of this kit of parts.

This is not a finished produ t, and the person assembling the kit is

responsible for ensuring that the finished produ t omplies with any

appli able lo al regulations governing ele tri al equipment, eg. UL, CE,

VDE.

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

2 TOOLS AND EQUIPMENT REQUIRED

2 1 Tools required to assemble the PCB

The following tools will be required to assemble the PCB:

- Soldering iron with a small tip (1-2 mm)

- Wire utters (tip: A small pair of nail lippers works very well for

this fun tion)

- Wire strippers (tip: A small pair of s issors is quite suitable)

- Multimeter

- Small flat s rewdriver for adjusting the high voltage supply

2 2 Materials you will need

Solder. Lead / tin solder is preferred. Lead free solder, as now

required to be used in ommer ial produ ts in Europe, has a mu h

higher melting point and an be very hard to work with.

Desoldering wi k (braid) an be useful if you a identally reate

solder bridges between adja ent solder joints.

2 3 Other items you will need

The lo k kit does not in lude a power adapter. This is be ause the

kit is sold to many ountries around the world, ea h with very

different household mains outlet so ket types. It is more effi ient

for the user to buy a suitable adapter lo ally. This saves shipping a

heavy adapter with the kit, and also the extra osts of managing

sto ks of many varied power adapters.

The type of power adapter an be obtained at very low ost. The

following type of adapter should be obtained and used with the kit:

Output 9-12V AC OR DC

Minimum power output apability of 250 mA

Output plug: 2.1mm pin

A suitable adapter is shown in figure 1 below:

Figure 1

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

3 LIST OF COMPONENTS

3 1 Table of components

Circuit Designation Part Description

Resistors

R1 100R, ¼ Watt

R2 5.6K, ¼ Watt

R3 390K, ¼ Watt

R4 3.9K, ¼ Watt

R5 10K or 5.6K, ¼ Watt

R6, R7, R8 100R, ¼ Watt

R9, R10 1K, ¼ Watt

R11 100R, ¼ Watt

Capa itors

C1, C2 22pF Cerami

C3 470uF, 16-25V, Ele trolyti

C4 100uF, 16-25V, Ele trolyti

C5 1uF, 250V, Ele trolyti

C6 0.1F Super ap

C7 100nF Cerami

Transistors

Q1 IRF730 N-Channel MOSFET

Q2 MPSA42 NPN

Diodes

D1 1N4001

D2 UF4004 Fast re overy diode

D3 Not installed

D4 1N4148 or BAT42

D5 5mm Bi olour LED

5mm White

or Blue

LED

D7 5mm Orange LED

Integrated Cir uits

IC1 78L05 5V Voltage regulator

IC2 PIC16F1827A 8-bit Mi ro ontroller

IC3 74141 / K155N Nixie driver

Mis ellaneous

L1 100uH – 470uH Indu tor

SW1, SW2, SW3 Miniature push button

VR1 1K Potentiometer

PCB PCB

IC so ket 18 Way IC so ket for IC2

SKT1-14 1mm Sso ket re epta le

Cable 6 m 2 Way able

X1 32.768 Khz Crystal

LS1 Piezo sounder

mis 2.1mm Chassis power so ket

mis 4 way 0.1” Header so ket

mis Clear insulation

mis 4 way Right angle pin strip

mis 60Khz or 77.5Khz RF Rx Module

mis Tuned ferrite antenna

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

3 2 Parts list / Packing sheet

Part Description Quantity

Resistors

100R, ¼ Watt 5

5.6K, ¼ Watt 2

1K, ¼ Watt 2

390K, ¼ Watt 1

10K, ¼ Watt 1

3.9K, ¼ Watt 1

Capa itors

470uF, 16-25V, Ele trolyti 1

100uF, 16-25V, Ele trolyti 1

1uF, 250V, Ele trolyti 1

22pF, Cerami 2

0.1F Super ap 1

100nF Cerami 1

Transistors

IRF730 N-Channel Mosfet 1

MPSA42 NPN 1

Diodes

1N4001 1

UF4004 Fast re overy diode 1

1N4148 or BAT42 1

5mm Bi olour LED 1

5mm White or Blue LED 1

5mm Orange LED

Integrated Cir uits

78L05 5V Voltage regulator 1

PIC16F1827A 8-bit Mi ro ontroller 1

74141 / K155N Nixie driver 1

Mis ellaneous

100uH – 470uH Indu tor 1

Miniature push button 3

1K Potentiometer 1

1mm So ket re epta le 14

SN18 PCB 1

IC So ket, 18 way DIL 1

Piezo Sounder 1

32.768Khz Crystal 1

6 m 2 Way able 1

2.1mm Chassis power so ket 1

6 m Clear insulation 1

4 way 0.1” Header so ket 1

4 way Right angle pin strip

60Khz or 77.5Khz RF Rx Module

Tuned ferrite antenna

Note 1: Optional item, for WWVB /DCF Syn hronisation

It is re ommended that the kit is he ked against the list above, to

ensure all parts are present before ommen ing assembly. Don’t be

alarmed if there are some extra omponents, as some omponent

bags are shared between different kit types.

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

3 3 How to identify the correct components

Resistors:

The resistors are easy to identify by the oloured bands

a ross the ylindri al body. Using a multimeter it should will

be possible very qui kly to identify the different values.

Transistors:

The MOSFET Q2 an easily be identified as it has a large

metal heatsink. Note: Due to part availability, this part may

be substituted for a different but equivalent part number so

the part marking may not ne essarily be ‘IRF730’

Diodes:

D1, 1N4001 is bla k with a white band and marked 1N4001.

A 1N4007 diode may be supplied instead. This is identi al for

this ir uit. The other bla k diode is D2, and again due to

part availability it may be substituted for an equivalent. D4

(1N4148) is small with a pink glass body.

Indu tor L1

The indu tor is a oil winding on a ferrite ore and may or

may not be finished with a heatshrink sleeve depending on

part availability. It may not have any part markings.

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

4 ASSEMBLY OF THE PCB

4 1 Diodes D1 and D2

Start by bending the leads of these two diodes to approximately

mat h the spa ing of the holes on the PCB. Insert the diodes taking

are to mat h up the white bands on the omponents with the

omponent marking on the PCB. See Figure 2 below.

Figure 2

Solder in the diodes, then using the wire lippers trim off the leads.

4 2 Diode D4

Note that there is no D3.

D4 is the remaining pink or blue diode. Again noting the position of

the band (whi h is bla k on this omponent), bend as shown in

figure 3, then pla e in position as per figure 4. Solder in and trim

the leads.

Figure 3 Figure 4

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

4 3 Resistors: R1 – R11

R5 sets the urrent through the Nixie Tube. Two values are

provided, atering for an IN-18 tube (5.6K) or an IN-8 tube (10K).

Choose the value for the type of tube your will be using. All the

resistors are installed verti ally to save board spa e. Bend ea h

resistor in turn as shown in figure 6 below:

Figure 6: Bend resistor lead as shown

The easiest solution is to pla e all the resistors at on e, then swiftly

turn the PCB upside down. A sheet of paper on the topside an

prevent all the resistors dropping out. The PCB will then sit neatly

on all the resistors, keeping them pushed firmly up against the

PCB. Figure 7 demonstrates this. You an then go around and

solder all the leads.

Figure 7

Nixie Clock ‘SN18’

www.pvelectronics.co.uk

4 4 C1 and C2

Pla e C1 and C2, the small erami apa itors. They may be a

different olour to the ones shown below. Trim the leads short and

lean on the base of the PCB.

Figure 8: C1 and C2

4 5 Q2 and IC1

These omponents look identi al ex ept for the part marking so be

very areful in pla ing these two omponents:

Q2: MPSA42

IC1: 78L05

Follow the white PCB marking whi h indi ates the orientation of the

omponent. Refer to figure 9, whi h shows Q2.

Figure 9

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