Nixie Clock Development Board v1 - · PDF filecontroller or coffee machine timer may be created using the “Nixie Clock Development ... • Alarm clock ... Real time clock and battery

Nixie Clock Development Board v1.3

User’s guide

Revision B-1

2

Table of contents 1. Introduction

1.1. Technical data ........................................................................... 4 1.2. Features ..................................................................................... 6 1.3. Block diagram ........................................................................... 7

2. Connectors 2.1. Tubes connectors....................................................................... 8 2.2. Programming connector ............................................................ 10 2.3. RS232 connector ....................................................................... 10 2.4. PS/2 connector........................................................................... 11 2.5. Power connector ........................................................................ 11 2.6. General purpose output and external switches .......................... 11

3. Functions implemented on the development board 3.1. High voltage drivers .................................................................. 12 3.2. In system programmer............................................................... 13 3.3. RS232 port................................................................................. 14 3.4. Real time clock.......................................................................... 15 3.5. Temperature sensor ................................................................... 16 3.6. Photo sensor and buzzer............................................................ 16 3.7. Power supply ............................................................................. 17 3.8. Buttons ...................................................................................... 18 3.9. Tube’s board.............................................................................. 18

4. Typical performance characteristics................................................. 19 5. Schematic diagram ........................................................................... 21

3

1. Introduction The “Nixie Clock Development Board v1.3” is first nixie clock experimenter's platform. This flexible, professionally designed development board is an ideal platform for any nixie clock project. While simple clock kit boards allow you to create your own projects with a minimum of hassle, the “Nixie Clock Development Board v1.3” goes one step further. It provides a test bed containing most of the circuitry commonly used by the Nixie clocks. Board has standard connectors for the tubes and adjustable power supply so any nixie tubes may be used. Many different projects such as: precise time base clock, GPS clock, heating system controller or coffee machine timer may be created using the “Nixie Clock Development Board v1.3”. Some examples written in C are included with the board as well as fully featured RTOS based firmware. The “Nixie Clock Development Board v1.3” is able to run programs written in assembler, C and PicBasic or PicBasic Pro. It also includes in-system programmer, so the resident PICmicroTM MCU may be reprogrammed on the fly. The Nixie Clock Development Board’s circuits and software (firmware) may not be reverse engineered, copied or used commercially without express written permission. PRECAUTION Relatively high voltage is generated on this board. Do not touch power supply, high voltage drivers and tube connections when clock is working. Otherwise is risk of electric shock.

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1.1. Technical data Feature Specification

Software Core1 Cooperative multitasking Real-Time Operating System.

Functions1

• Clock HH:MM:SS o 12/24 hour mode

• Date o DD:MM:YY mode o MM:DD:YY mode

• Temperature o Celsius mode o Fahrenheit mode

• Alarm clock • GPS time and date synchronization2 • Selectable time zone • Visual effects

o Crossfade (selectable deep) o Scrolling line3

• Night dimming (selectable level)

Your own software

PICmicro™ is not locked. You can write your own software to meet custom functionality requirements. Several board related functions and examples (written in C) is provided with the board.

Programmer Third party software, freely downloadable. Hardware

Power supply Unregulated 12VDC 1A supply via PSU 5.5mm jack, positive inner. Fuse protection from reverse polarity.

Power consumption

Depends on tubes and external devices used. With small and medium size nixie tubes approx. 500mA at 12V.

Number of nixie tubes

Board is able to interface up to 6 nixie tubes. Any NIXIE tubes4 may be interfaced due standard connectors.

High voltage output

When using 10K anode resistors, board is able to supply 3.5mA at 180V to each tube5

High voltage power supply

High efficiency “Boost” topology switched mode power supply with pulse width modulation. Regulated output voltage in range 100-180V. PWM input from PICmicro™ microcontroller hardware module. PICmicro™ is able to adjust the output voltage by 20V.

Driving mode Direct drive, 6 high voltage BCD decoders (74141 or derivates). Hardware 1Hz output to colon separators (may be programmed to other frequency, blanked or lit constantly).

Tubes connector 2x 40PIN connectors. Outputs directly for tubes and colon separators.

COM (DB9) port

Tx/Rx only, RS232 levels. Supports all standard and custom baud rates provided by PICmicro™ hardware USART

LPT (DB25) port Buffered LPT port, for microcontroller programming only.

PS/2 port Provides up to 150mA @ 5V power supply for external devices. Data

5

I/O not implemented.

Main processor

Microchip PIC16F877, 8-bit, 20MHz, CMOS FLASH microcontroller. 8K x 14 words of FLASH Program Memory 368 x 8 bytes of Data Memory (RAM) 256 x 8 bytes of EEPROM data memory

Programmer Fully automatic in system programmer with automatic switches. Onboard RESET pushbutton. Programming mode LED.

Time base

Real-time clock (RTC) counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100. 56-byte, battery-backed, nonvolatile (NV) RAM for data storage. Battery backup up to 10 years. I2C interface.

Backup battery Lithium, 3V, CR2032 type.

Temperature sensor

High precision digital thermometer. Measures temperature from –55°C to +125°C (–67°F to +257°F). 0.5°C accuracy from –10°C to +85°C. 0.1°C accuracy may be achieved using special algorithms.

Sound On board buzzer (shared port with light sensor). Resonance frequency 2.048 KHz

Light sensor On board photo resistor. Sensitive to 520-590nm wavelength.

Control 2 pushbuttons onboard with external connectors. Implemented PICmicro™ I/O over current protection.

General purpose output 12V, 200mA programmable output. (Shared with colon separator)

Physical dimensions

Nixie Clock Development Board (W, L, H): 100mm x 160mm x 17mm, 4 mounting holes, 3.1mm in diameter each (Euro PCB). Weight 160g.

Working temperature range

–10°C to +70°C 6,7

Parts, PCB No SMD parts used, therefore easy to assembly. Professionally routed and manufactured, silk-screened, solder masked, FR4 type PCB. 2 – layers with via’s metallization.

1- Firmware v1.3 2- Via external GPS receiver at RS232 port, 4800 baud (NMEA-0183 protocol, $GPRMC message) 3- Scrolling line effect also protects nixie tubes from cathode poisoning. 4- Except CD47 / GR-411 and B-7971 tubes. 5- It is recommended to use 2.2K anode resistors (R33 - R35, R40 – R42) for large tubes such as IN-18 or Z566M. 6- Most parts on the Nixie Clock Development Board have industry temperature range. 7- It is allowed for nixie tubes to use them in –10°C temperature not longer that 4 hours

in a day. Lifetime of the tubes in this case is reduced.

6

1.2. Features

1. Power connector - unregulated 12VDC 1A supply via PSU jack (positive inner) 2. PS/2 standard connector to supply 5V power to external devices (such as GPS) 3. DB9-plug RS232 (COM) connector. Connects external devices with the board 4. DB25-plug connector - connects board to PC - LPT port via standard 25 way cable 5. Fuse protection 6. High voltage regulator 7. RS232 – TTL – RS232 Driver 8. Programmer logic 9. Backup battery 10. Switch mode power supply MOSFET transistor 11. Switch mode power supply controller 12. Real time clock and battery backupped RAM 13. Digital temperature sensor 14. Programming mode LED 15. 5V regulator 16. Light sensor 17. MCU reset pushbutton 18. Microchip PIC16F877 MCU 19. Buzzer 20. Control pushbuttons 21. Connector for external buttons and programmable output 22. High voltage BCD drivers 23. Connector for NIXIE tubes 24. Connector for NIXIE tubes

7

1.3. Block diagram

8

2. Connectors

2.1. Tube connectors (J8, J9) WARNING: High voltage on these connectors. 40-pin (100mil) header (compatible with an IDE flat cable). Used to connect nixie tubes and colon separators. Each connector involves connection for 3 tubes and 2 semicolon separators. Typical pin descriptions of these connectors are shown in the table below. Tubes is counted from the left to the right, assuming that hours most significant digit is on the left and seconds least significant digit is on the right. Following shortenings will be used: 1-1 – meaning: 1-st tube’s “1” cathode 1-9 – meaning: 1-st tube’s “9” cathode 3-A – meaning: 3-d tube’s anode S1-A – meaning 1-st semicolon separator’s anode S1-C – meaning 1-st semicolon separator’s cathode

9

Description Pin Connector J8 Connector J9 1 1-A 4-A 2 1-A 4-A 3 1-1 4-1 4 1-2 4-2 5 1-3 4-3 6 1-4 4-4 7 1-5 4-5 8 1-6 4-6 9 1-7 4-7 10 1-8 4-8 11 1-9 4-9 12 1-0 4-0 13 2-A S3-C 14 2-A S3-A 15 2-1 S4-C 16 2-2 S4-A 17 2-3 5-A 18 2-4 5-A 19 2-5 5-1 20 2-6 5-2 21 2-7 5-3 22 2-8 5-4 23 2-9 5-5 24 2-0 5-6 25 S1-C 5-7 26 S1-A 5-8 27 S2-C 5-9 28 S2-A 5-0 29 3-A 6-A 30 3-A 6-A 31 3-1 6-1 32 3-2 6-2 33 3-3 6-3 34 3-4 6-4 35 3-5 6-5 36 3-6 6-6 37 3-7 6-7 38 3-8 6-8 39 3-9 6-9 40 3-0 6-0

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2.2. Programming connector (J4) DB25-type standard connector. Plug type. Connects board to PC - LPT port via standard 25 way cable. Designed for programming PICmicro™ microcontroller. Can’t be used for other purposes.

Pin Description 1 Not connected 2 DATA IN 3 CLOCK 4 Not connected 5 RESET 6 PROGRAM 7 Not connected 8 Not connected 9 Not connected 10 DATA OUT 11 BUSY 12 Not connected 13 Not connected 14 Not connected 15 Not connected 16 Not connected 17 Not connected 18 Ground 19 Ground 20 Ground 21 Ground 22 Ground 23 Ground 24 Ground 25 Ground

2.3. RS232 connector (J3)

DB9-type standard connector. Plug type. Connects external devices with the board. RS232 levels, Rx/Tx only, modem control lines are not available.

Pin Description 1 Not connected 2 COM- Rx 3 COM -Tx 4 Not connected 5 Ground 6 Not connected 7 Not connected 8 Not connected 9 Not connected

11

2.4. PS/2 connector (J2) PS/2-type standard connector, receptacle type. Provides 5V power supply to external devices such as GPS receiver.

Pin Description 1 Not connected 2 Not connected 3 Ground 4 +5V 5 Not connected 6 Not connected

2.5. Power connector (J1) Jack type 5.5x2.1mm standard connector, receptacle type. Provides power to the board. Should be connected 12V, 1A unregulated direct current power supply. Connector: Positive inner Negative outer

2.6. General purpose output and external switches (J5, J6, J7) 6 terminal screw connector. Connections for external pushbuttons and 12V programmable output.

Connector Pin Description

1 Open collector output (npn transistor) J7

2 +12V 3 SW1 input J6 4 SW1 power 5 SW2 input J5 6 SW2 power

12

3. Functions implemented on the development board

3.1. High voltage drivers The 74141 (K155ID1) is a BCD-to-decimal decoder designed to drive gas-filled NIXE tubes. The device is also capable of driving other types of low current lamps and relays. Full decoding is provided for all possible input states. For binary inputs 10 through 15, all the outputs are OFF. Therefore the 74141, combined with a minimum of external circuitry, can use these invalid codes in blanking leading- and/or trailing-edge zeros in a display. Input clamp diodes are also provided to clamp negative voltage transitions in order to minimize transmission-line effects. To limit maximum current for the tubes, anode resistors are used. It is recommended to use following resistors: for small and medium nixie tubes - 10K, for large nixie tubes - 2.2K (included on request), for colon separators – 22K. Tubes is counted from the left to the right, assuming that hours most significant digit is on the left and seconds least significant digit is on the right.

Tube IC on the PCB Address PICmicro™ output A3 RA5 A2 RE2 A1 RE1 T1 U10

A0 RE0 A3 RA4 A2 RA3 A1 RA2 T2 U9

A0 RA1 A3 RD7 A2 RD6 A1 RD5 T3 U11

A0 RD4 A3 RD3 A2 RD2 A1 RD1 T4 U12

A0 RD0 A3 RB7 A2 RB6 A1 RB5 T5 U14

A0 RB4 A3 RB3 A2 RB2 A1 RB1 T6 U13

A0 RB0

13

3.2. In system programmer

0

R5

22kR14

22k

0

0

0

VCC5

0

0

RB6

R6470

J4

CONNECTOR DB25

13251224112310229218207196185174163152141

RESET

R20

4.7k

SW3

0

D212V Zener

R8

4.7k

Q2

2SA1266

R747k

0

PGM_SIGNAL

PGM_OUT

Q42N2222

R4

22k

0

R25

220

R3

22k

VCC5

RB7

0 0

R10220

U3

4053

12345678 9

10111213141516

2Y12Y03Y13Z3Y0~EVeeGnd S3

S2S1

1Y01Y1

1Z2Z

Vcc

VCC5

0

R94.7k

0

0

U2

4050

12345678 9

10111213141516

Vcc1Y1A2Y2A3Y3AGnd 4A

4Y5A5Y

N C6A6YNC

R2

22k

VCC12

D4

LED

Q32N2222

SEC_HI_NIB_A3

SEC_HI_NIB_A2

MCLR

Signals from the PC are buffered, to ensure consistent voltage levels, by U2 - a 4050. The pins RB6 and RB7 are used on the PICmicro™ device for both programming and reading data and the PC needs direct control of these devices. This is facilitated by the use of two analogue switches U3:2 and U3:3 which are controlled by the program pin (pin 6) on the parallel port via U2:4. When the program pin is high, data in and clock in are directed to the PICmicro™. When the program pin is low then RB6 and RB7 on the PICmicro™ are routed to the rest of the port B bus. The program pin also ensures that 12V is routed to the PICmicro™ via the combination of Q2 and Q3 using zener diode to provide a regulated programming voltage. Automatic reset after programming is provides by the reset line from the parallel port (pin 5) and Q4.

14

3.3. RS232 port Nixie clock development board provides RS-232 serial interface for communication with external devices such as GPS receiver or personal computer.

VCC5

0

RX

VCC5

0

C51u

C41u

U1

MAX232

12345678 9

10111213141516C1+

Vs+C1-C2+C2-Vs-T2OutR2In R2Out

T2InT1In

R1OutR1In

T1OutGndVcc

J3

CONNECTOR DB9

594837261

0

TX

C1

1u

C6

1u

The interface is provided via DB9 type plug connector. MAX232 interface driver/receiver is used to convert native RS-232 voltages to PICmicro™ compatible TTL voltage levels. TTL Tx and Rx nets are routed to the PICmicro™ RC6 (pin 25) and RC7 (pin 26) pins, so internal USART module may be used. For connecting the board to PC use a serial null-modem cable:

15

3.4. Real time clock A real time clock (RTC) provides time data for the PICmicroTM and 56-byte battery-backed nonvolatile RAM for data storage.

DS1307 RTC with I2C interface is used in nixie clock development board. 3V battery supply is needed for correct RTC functionality and storing time data in case of a power failure. DS1307 and PICmicro™ communicate through I2C, bidirectional bus. RC3 (pin 18) and RC4 (pin 23) PICmicroTM pins are used for I2C bus operations by internal MSSP module. DS1307 also provides programmable square-wave output signal (PGM_SIGNAL) or constant level programmable output, which is routed through multiplexer U3 and transistor Q5 directly to tube connectors and general purpose J7 connector. PGM_SIGNAL provides signal for nixie tube’s colon separator pins. A square-wave frequency of 1 Hz, 4.096 kHz, 8.192 kHz or 32.768 kHz might be chosen. General purpose output (connector J7) provides programmable output with output voltage 12V and current up to 200mA. Programmable output signal is shared between colon separators and general purpose output.

16

3.5. Temperature sensor The board is equipped with high precision digital thermometer DS1820.

It measures temperature in range from –55°C to +125°C (–67°F to +257°F). Temperature is converted to digital word in several milliseconds and read from the DS1820 over a 1–WireTM interface, so that only one wire is connected to PICmicroTM RC5 ( pin 24).

3.6. Photo sensor and buzzer The board is equipped with photo resistor for measuring environment illumination and buzzer for sound generation.

Analogue signal from photo resistor is routed to the PICmicroTM RA0 (pin 2) analogue input. An internal PICmicroTM Analog-to-Digital module is used to convert analog singal to digital. Onboard buzzer is connected to the PICmicroTM RA0 (pin 2) via decoupling capacitor C15. When configured as output, RA0 pin generates sound signal for buzzer. It is recommended to measure illumination not sooner than 1s after pin direction change.

17

3.7. Power supply

There are two power supply modules onboard. One – the LM7805 based 5V regulated power supply. And another one for supplying nixie tubes – high efficiency boost topology switched mode power supply with pulse width modulation.

The TL494 (U7) is used for the control circuit of the PWM switching regulator. Output voltage may be set in a range 100-180V by R1 potentiometer. Additionally, PICmicro™ is able to adjust the output voltage by 20V via internal PWM (CCP) module, RC2 (pin 17).

18

3.8. Buttons The board has 2 control buttons, SW1 and SW2.

5

SW1

4

SW2

SW2

3

J6

VCC5

SW1

R24

220

J5

0

R312.2k

R26

220

0

R322.2k

6

Onboard buttons SW1 and SW2 are connected to the PICmicroTM RC0 (pin 15) and RC1 (pin 16) respectively. An R24 and R26 resistor protects PICmicroTM port from accidental port direction mis-setting. It is possible to connect external control buttons to J5 and J6 connectors.

3.9. Tube’s board A small PCB is included with “Nixie Clock Development Board v1.3” which carry 6 nixie tubes. Two 40-pin receptacle type connectors may be connected directly to the development board.

There are two solderable jumpers across each tube on the bottom side of tube’s board, which connects appropriate dots of the tube to the programmable output. Recommended anode current for the IN-16 nixie tubes is 2 mA. It is easy to measure voltage across the anode (limiting) resistor and then calculate current.

19

4. Typical performance characteristics

4.1. Nixie Clock Development Board with 6 x IN-16 tubes, 10K anode resistors

Current consumption

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0 0.2 0.4 0.6

Input current at 12V [A]

Ano

de c

urre

nt [m

A]

Output VA characteristic

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

120 130 140 150 160 170 180 190

Output voltage [V]

Ano

de c

urre

nt [m

A]

4.2. Nixie Clock Development Board with 6 x IN-18 tubes, 10K anode resistors

Current consumption

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 0.2 0.4 0.6


Ano

de c

urre

nt [m

A]


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

120 130 140 150 160 170 180 190

Output voltage [V]

Ano

de c

urre

nt [m

A]

20

4.3. Nixie Clock Development Board with 6 x IN-18 tubes, 2.2K anode resistors

Current consumption

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0 0.2 0.4 0.6 0.8 1


Ano

de c

urre

nt [m

A]


0.0

1.0

2.0

3.0

4.0

5.0

6.0

120 130 140 150 160 170

Output voltage [V]

Ano

de c

urre

nt [m

A]

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Copyright 2004, TubeHobby 1.3

High voltage drivers - part 2

A4

1 6Saturday, November 20, 2004

Title

Size Document Number Rev

Date: Sheet of

SEC_HI_NIB_A0

SEC_HI_NIB_A1

SEC_HI_NIB_A2

SEC_HI_NIB_A3

SEC_LO_NIB_A0

SEC_LO_NIB_A1

SEC_LO_NIB_A2

SEC_LO_NIB_A3

Vcc_HI

Vcc_HI

MIN_LO_NIB_A2

MIN_LO_NIB_A0

Vcc_HI

MIN_LO_NIB_A3

MIN_LO_NIB_A1

Switch

0

0

VCC5

VCC5

0

VCC5

U14

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

J9

CON40 Plug

123456789

10111213141516171819202122232425262728293031323334353637383940

R40

10kU12

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

R41

10k

R42

10k

R38

22k

U13

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

R39

22k

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A


High voltage drivers - part 1

A4


Title


Date: Sheet of

HOU_LO_NIB_A1

HOU_LO_NIB_A0

HOU_LO_NIB_A3

Vcc_HI

HOU_HI_NIB_A3

HOU_LO_NIB_A2

HOU_HI_NIB_A2

Vcc_HI

HOU_HI_NIB_A1

HOU_HI_NIB_A0

MIN_HI_NIB_A0

MIN_HI_NIB_A3

Vcc_HI

MIN_HI_NIB_A2

MIN_HI_NIB_A1

Switch

0

0

VCC5

VCC5

0

VCC5

R36

22k

R37

22k

J8

CON40 Plug

123456789

10111213141516171819202122232425262728293031323334353637383940

R34

10k

U10

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

U11

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

R33

10k

U9

K155ID1

16

15891314111012

3674

512 Y0

Y1Y2Y3Y4Y5Y6Y7Y8Y9

A0A1A2A3

VddGnd

R35

10k

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

U8


Microcontroller unit

A4


Title


Date: Sheet of

RB7

RB6

SEC_HI_NIB_A1

SEC_HI_NIB_A0

SEC_LO_NIB_A3

SEC_LO_NIB_A2

SEC_LO_NIB_A1

MIN_HI_NIB_A3

MIN_HI_NIB_A2

MIN_HI_NIB_A1

MIN_HI_NIB_A0

MIN_LO_NIB_A3

MIN_LO_NIB_A2

MIN_LO_NIB_A1

MIN_LO_NIB_A0

HOU_HI_NIB_A3

HOU_LO_NIB_A2

HOU_LO_NIB_A1

HOU_HI_NIB_A0

HOU_HI_NIB_A1

HOU_LO_NIB_A0

HOU_LO_NIB_A3

HOU_HI_NIB_A2

SEC_LO_NIB_A0

PWM

SDA

SW1

TX

Light

SCL

SW2

1W

RX

MCLR0

0 0

VCC5

0

VCC5

R27

4.7k

C10330n

Y1

20MHzC11

22p

C17

22p PIC16F877

234567

3334353637383940

2625242318171615

3029282722212019

8910

1132123113141

RA0/AN0RA1/AN1RA2/AN2/Vref-RA3/AN3/Vref+RA4/T0CKIRA5/AN4/SS

RB0/INTRB1RB2

RB3/PGMRB4RB5

RB6/PGCRB7/PGD

RC7/RX/DTRC6/TX/CKRC5/SDORC4/SDI/SDARC3/SCK/SCLRC2/CCP1RC1/T1OSI/CCP2RC0/T1OSO/T1CKI

RD7/PSP7RD6/PSP6RD5/PSP5RD4/PSP4RD3/PSP3RD2/PSP2RD1/PSP1RD0/PSP0

RE0/RD/AN5RE1/WR/AN6RE2/CS/AN7

Vdd1Vdd2Vss1Vss2OSC1/CLKINOSC2/CLKOUTMCLR/Vpp/THV

RC3RC4

RB7RB6RB5RB4RB3RB2RB1RB0

RD7RD6RD5RD4RD3RD2RD1RD0

RE2RE1

RC0RC1RC2

RC5

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

RA5

RE2

RE1

RE0

RA4

RA3

RA2

RA1

RA4RA3RA2RA1RA0

RC2

RC1

RA0

RC0

RC5

RC3

RC4

RC6

RC6RC7

RC7

RE0

RA5

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Voltage


Power supply

A4


Title


Date: Sheet of

Vcc_HI

PWM

VCC12

000 0 0 0 00 0

00

000

0

VCC5

0

VCC5

0

0

0 0

D51N4148

R28

100k

C13470u

R1547k

Q1

2SA1266

R17

1k

C21u R12

6.8k

L1

270uH

R11

47k

J1

CONN JACK PWR

J2

PS/2

642

531

R13

220

C810n

M1

IRF640

R125k

C9

1u 250V

TL494

U7

12345678 9

101112131415161+

1-COMPDTCCtRtGndC1 E1

E2C2

VccOC

Vref2-2+

D1

1N4004

U6

LM7805

1

2

3Vin

Gnd

Vout

D3

UF4007

C14

10u

R2922k

C16

330n

C7

330n

C3330n

F1

FUSE 1A

R16

910k

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

+

4 3

56

1

2


Peripheral

A4


Title


Date: Sheet of

SCL

SDA1W

Light

SW2

SW1

TX

RX

Switch

VCC12

PGM_OUT

PGM_SIGNAL

VCC5

0

0

0

VCC5 VCC5

0

0 0

VCC5

0 0

VCC5VCC5

00

00

R26

220

C41u

C1

1u

J7

C15

330n

C6

1u

U4

DS1307

1234

8765

X1X2VbatGnd

VddSQW/OUT

SCLSDA

R24

220

R22

4.7kR21

4.7k

U1

MAX232

12345678 9

10111213141516C1+

Vs+C1-C2+C2-Vs-T2OutR2In R2Out

T2InT1In

R1OutR1In

T1OutGndVcc

J5

B1

AL-60P01

C51u

R234.7k

R19

47k

+ V1

3V Lithium Battery

R18

MPY7P

SW2

Q5MPSA42

C12330n

R322.2k

Y232.768KHz

R304.7k

U5

DS1820

123

GndDQ

Vdd

J3

CONNECTOR DB9

594837261

SW1

J6

R312.2k

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

RESET


Parallel port programmer

A4


Title


Date: Sheet of

RB6

RB7

SEC_HI_NIB_A2

SEC_HI_NIB_A3

VCC12

MCLR

PGM_SIGNAL

PGM_OUT

0

0

0

VCC5

0

0

VCC5

0

0

0 0 0 0 0

0

VCC5

0

R5

22kR8

4.7k

R747k

Q42N2222

R25

220

U2

4050

12345678 9

10111213141516Vcc

1Y1A2Y2A3Y3AGnd 4A

4Y5A5Y

N C6A6YNC

R20

4.7k

R6470

D4

LED

R14

22k

R2

22k

Q2

2SA1266

J4

CONNECTOR DB25

13251224112310229218207196185174163152141

SW3

R3

22k

R94.7k

Q32N2222

D212V Zener

R4

22k

U3

4053

12345678 9

101112131415162Y1

2Y03Y13Z3Y0~EVeeGnd S3

S2S1

1Y01Y1

1Z2Z

Vcc

R10220

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Hour 10

Hour 1

Minutes 10

Left Connector

Copyright 2004 TubeHobby 1.3

Tube's Board - part 1

A

1 1Sunday, November 21, 2004

Title


Date: Sheet of

J1

CON40

12345678910111213141516171819202122232425262728293031323334353637383940

T3

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

T1

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

T2

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Minutes 1

Seconds 10

Seconds1Right Connector

Copyright 2004 TubeHobby 1.3

Tube's Board - part 2

A

1 1Sunday, November 21, 2004

Title


Date: Sheet of

J2

CON40

12345678910111213141516171819202122232425262728293031323334353637383940

T4

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

T6

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

T5

IN-16

12

3

4

5

678

9

10

111213

Anode1

7

3

Left Dot

456

2

Right Dot

890

Documents

Nixie Clock Development Board v1 - · PDF filecontroller or coffee machine timer may be created using the “Nixie Clock Development ... • Alarm clock ... Real time clock and battery