alphanumeric clock.pdf

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Protel Schematic
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6
TP1 +180 V
L1
D5
D
9-12 V AC input, if Mains frequency wanted
12-14 V DC input is ok, if DCF is used
D4
1N4001
D
100uH 1A
+
C4
1uF 350v
BYV95C
+ C3
470uF 25v
AC
Q1
MPSA92
Q2
MPSA92
Q3
MPSA92
R25
33k
IC2
7805
9-12V AC
D3
1N4001
R1
100k
R3
100k
R5
100k
R7
220k
IC5
NE 555
R27
1k
AC
R19
1k
1
IN
OUT
3
+5 Volt
5
C TL
OUT
3
2
7
T RIG
DISC
R2
470k
R4
470k
R6
470k
+
+
Q7
IRF730
4
RST
D2
1N4001
D1
1N4001
R24
1kTrim
C11
470uF 25v
C10
10uF 50v
6
THR
R26
10k
C13
47p
Q8
MPSA42
R14
33k
C14
2n2
J3
ANODE
R23
470
If DCF option is used, see here how to connect
1Hz / 50 Hz / 60 Hz (5V level)
PIN 2
Adjust R24 for +180V DC on test point 1
R9 4k7
Start with center position at first powerup
D9
BZX79C5V6
DCF77 Module Conrad
Connector pin number
R8 4k7
C12
22nF
PIN 1
Ano de
N1
NIXIE-B7971
Ano de
N2
NIXIE-B7971
Filter
Protection
Q4
MPSA42
PIN 4
C
8
8
C
NC
NC
DCF GND
VCC
R 20
33k
16
16
1
4
1
4
For this B7971 two digit mode
Use R8 and R9 = 4k7
Adjust anode voltate to = 180V
15
5
15
5
R16
33k
R17
33k
R33
33k
R18
10k
J1 PGM
Programming socket
12
7
12
7
UP / DIMM
14
17
6
14
17
6
Q5
MPSA42
3
3
S2
10
10
R 21
33k
9
9
SET MODE / RUN MODE
2
2
S1
IC1 PIC16F876
Q6
MPSA42
R 22
33k
1
3
4
5
6
7
8
9
10
11
12
13
14
MCLR
AN1
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0/INT
VDD
GND
RC7/RX
RC6/TX
RC5
RC4
28
2
27
AN0
AN2
AN3
RA4
AN4
GND
OSC1
OSC2
RC0
RC1
RC2
RC3
26
25
B
24
B
23
+5
22
21
20
C7
22nF
X1
4 MH z
19
R30
470
R31
470
R32
470
18
The LED section is optional
and is not in the PCB layout
17
J4
C31
2 2pF
LDR OPTION (NOT INCLUDED IN KIT)
C30
22pF
16
15
R40 LD R
R41 3k3
+5
J5
GREEN
RED
RED
AN0 PIN2
LDR option is automaticly disabled if voltage is over 4.7
D30
D31
3
A
AN0 voltage
DIMM level
6
2.94 - 4.7V
3 = Max (fading mode)
7
B
2.25 - 2.74V
1.47 - 2.15V
0.78 - 1.37V
2
1
0 = Min
4
C
D
3
IF 1Hz / 50Hz / 60 Hz:
IF DCF77 Option:
+5
C9
22nF
5
6
A
Reserved
S2 switch active
To adjust light levels to your need,
simply adjust R41 and R16 values a bit
0.11 - 0.76
0.0 - 0.1
Pin4 = Blink 1Hz
Pin5 = Blink 0.5Hz
Pin7 = AM/PM indicator
It is optional to use -
those outputs.
X1 4MHz Resonator
C30 and C31 not mounted.
D30 is Dual LED GREEN/RED signal indicator.
D31 is a normal RED led, Change 1min = DCF OK,
X1 4.000000 Crystal 30ppm
C30 and C31 crystal loading, ceramic NP0/C0G type
VCC
7
B
12
4
C
Fast blink = DCF bad for 24hrs warning.
GND
D
IC3
74141
+5
5
A
A
C5
22nF
VCC
12
GND
Title
NIXIE CLOCK OZ2CPU
Special muxed 7971
IC4
74141
Thomas Scherrer & Claus Urbach (webx.dk & nixieclocks.de)
8b-2-B7971
Size
B
Date:
Number
Revision
The software 5.3 for this version PCB 1.08 has autodetection of all four clock input modes !!
If there is a LOW pulse signal on the DCF77 input pin, while powering up, it will go into DCF mode,
else it will measure the input clock frequency and set right divider mode. Please read documentation for more information about how the different clock modes work
Schematic for nixie clock PCB 1.08
18-Dec-2005
Sheet of
1 1
File:
D:\TST\DIV\NIXIE\pcb108-kit-switchmode\108sm.ddb
Drawn By:
OZ2CPU Thomas Scherrer
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