TellyMate TTL Kit - Construction

This is the Contruction Guide for the TellyMate TTL Kit.

Note: It's assumed that someone making this kit already has the ability to solder through-hole parts.


Kit Contents

Kit Contents

Kit Contents

PCB marking part qty notes
IC1 IC Socket 1 Mark at end indicates orientation
- pre-programmed Mega 8 (or equivalent) 1 Mark at end indicates orientation
C6,C7 22pf disc capacitor 2 marked '22'
C8,C9 100nF disc capacitor 2 marked '104'
C10 10μF electrolytic capacitor 1 Polarity warning: -ve lead marked on case, +ve lead marked on PCB
R1 1kΩ resistor 1 Brown, black, red
R2 330Ω resistor 1 Orange, Orange, brown
R5 10kΩ resistor 1 Brown, black, orange
R6 75Ω resistor 1 Violet, green, black
D1,D2 1N4148 signal diode 2 Polarity warning: cathode marked on body and PCB
Q1 16Mhz crystal 1 marked 16.0 or similar
- 6 way double-row header pins 1
- 17 way single-row header pins 1 for snapping to length, as required.
- Green jumpers 3
- Red jumpers 4
- Phono socket 1 Bright yellow

Other things you'll need

The following items are not included in the kit.

Suggested Soldering Order

Step-by-step photo's

In the following photographs, the parts are shown soldered into place. It is expected that the person soldering the kit is comfortable soldering through-hole parts, hence detail of the underside is not shown.

  1. IC1 chip socket
    IC1 orientation mark

    IC1 socket showing orientation

    Ensure that the IC socket is located the correct way 'round.
    To aid with alignment, it's suggested that only a couple diagonally opposite pins are soldered to start with. Alignment should then be checked (and adjusted if neccesary) before soldering the remaining pins.

  2. C6, C7
    C6, C7

    C6, C7 : 22pf

    C6 and C7 : The 22pF disc capacitors are marked '22'.

  3. Q1
    16Mhz crystal

    16Mhz crystal

    Q1 : The 16Mhz crystal is likely to be marked '16.0' or similar.

  4. C8, C9
    C8, C9

    C8, C9 : 100nF

    C8 and C9 : The 100nF disc capacitors are marked '104'.

  5. R5

    R5 : 10kΩ

    R5 : The 10kΩ resistor is colour-coded brown, black, orange.

  6. Jumper pins 1-6
    J1-6 pins

    J1-6 header pins

    J1-6 use the 6-way double-row header pins.

  7. Jumper pins 7
    J7 pins

    J7 header pins

    J7 uses the two of the single-row header pins. These should be carefully snapped off using pliers or similar.

    snap-off pins

    Snapping off header pins

  8. R6, R2 and R1
    R5, R2 and R1

    R5, R2 and R1

    R6 : The 75Ω resistor is colour-coded violet, green, black.
    R2 : The 330Ω resistor is colour-coded orange, orange, brown.
    R1 : The 1kΩ resistor is colour-coded brown, black, red.

  9. D1, D2
    D1, D2

    D1, D2 : 1N4148

    D1 and D2 are 1N4148 signal diodes.
    They are polarity sensitive, and should be installed so that the cathode mark on the body of the component matches that on the PCB.

  10. C10

    C10 : 10μF

    C10 is an electrolytic capacitor.
    It is polarity sensitive, and should be installed as per the markings on the PCB.

  11. Phono socket
    Phono Socket

    Phono socket

    To aid with alignment, it is suggested that only the centre pin is soldered initially. Alignment can then be checked and adjusted before soldering the remaining two pins.

  12. Connectivity Options

  13. header pins (depending on required configuration) There are three likely configurations of the header pins used for power and I/O.
    In each case, the correct number of header pins will need to be snapped off.
    1. For straddling an Arduino:
    2. Arduino Pins

      Pins to straddle an Arduino

      Solder header pins on the underside of the board.
      3 and 4 either side of the phono connector.
      8 on the opposite end of the board.

      Note that only a few of these pins are used for electrical connectivity - the remainder are to provide an element of physical support whilst the TellyMate TTL Kit is connected to the Arduino.

    3. For use with a USB -> TTL serial adapter
    4. 6 way header

      Using the 6 pin header

      Solder the row of 6 header pins on the topside of the board

    5. General purpose
    6. General Purpose pins

      General purpose headers

      Solder the pins as highlighted in the photograph.

    Note: You are, of course, free to use whichever header pins you like. Similarly labelled pins are electrically identical, so it doesn't matter, for example, which of the 'RX' pins you use.


If we've missed something out, we're not making sense or have just plain got something wrong, let us know.

Revision History:

Date Details
02/10/2010 Photo update: Changed highlight boxes on "options" photos to be more visible.
29/09/2010 Initial release of page.