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Building a Breadboard!

Discussion in 'Hobby Electronics' started by Darren McInnes, Sep 26, 2005.

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  1. Hello All,

    After 20+ years i've finaly gotten sick of breadboarding on an old Rod
    Irving solderless breadboard.

    Now i'm building a self-contained unit with power supply, etc..

    I was interested in knowing what things you guy's would put in one if you
    build one.

    Construction will be fairly basic, a wooded box 40x50 with a perspex front
    panel (for the LCD Display)

    And yes i'm doing web searches and looking up all the old sources (Don
    Lancaster's TTL Cookbook)

    I might use an old AT power supply for the main voltages but will probably
    never need more than 1-2A

    Best Regards All,

    Darren McInnes
     
  2. Rob

    Rob Guest

    I reckon a breadboard on top of an old BWD Minilab would be good. The link
    might give you some ideas.

    http://www.mcvan.com/acrobat/BWD604V3.pdf

    There's got to be a pile of old minilabs from high school labs lying around
    somewhere.
    rob
     
  3. dmm

    dmm Guest

    Switchable frequency generator, from 1Hz to 10Mhz.
    5 x 7 dot matrix LED display
    4 x 4 keypad
    ULN2003 buffer
    1 x 8 led array
     
  4. Wow, that's a flash one. It's got digital displays. :) My old 603B has
    developed a fault or two.
    Anyone got a schematic they want to share or know a website that hosts one?

    Cheers,
    Alan
     
  5. Craig Hart

    Craig Hart Guest

    McVann instruments is what's left of BWD. By all acccounts they're most
    helpful.

    They're in geddes rd glen waverly vic. number's in the book.

    I know them well as I installed/maintained their Novell server for a number
    of years.
     
  6. Yes, you could use my 10MHz DDS generator project:
    http://alternatezone.com/electronics/dds.htm
    Also a multiplexed 7seg LED display, say 4 digits with transistor
    sinks.
    - RS232 chip and DB9 connector
    - USB Interface
    - Various power supplies (most important), say fixed +/-15V, +/-12V,
    +/-5V, 5V, 3.3V, and one variable supply (0-15V) with adjustable
    current limiting (0-1A) which goes all the way down to 0V. A switchable
    AC power supply would be nice to.
    - Speaker and buzzer
    - A few pots (say 1K and 100K)
    - Maybe some general purpose analog blocks like a precision diff-amp
    and some adjustable filters.

    Dave :)
     
  7. Thanks Craig.

    Cheers,
    Alan
     
  8. Tom

    Tom Guest

    Just had a look at that page, looks good but the PIC firmware is nowhere
    to be found and you do not sell kits or preprogrammed PICs... makes it
    hard to build one.

    Tom
     
  9. A quick email would have fixed that.
    Here is the firmware:
    http://alternatezone.com/electronics/files/ddsfrq21.hex
    Sorry, haven't got around to putting it back up on the site yet.

    No kits or parts?, gave that up, can't please everyone. Some want a
    full kit, then some complain it's too expensive, some want just the
    chip, some want just the PCB, some want just the chip soldered to the
    board, some just want the programmed chip, some want it modified this
    way or that, some want a completely built unit, some want to buy all
    their own parts but want me to build it for them, some want me to
    explain how it works because they couldn't understand the article, some
    complain when they soldered the chip in backwards or fried it with an
    iron, some can't get it working and send it back to get it fixed "under
    warranty"...

    Parts are all readily available, those that want to build it can.

    Dave :)
     
  10. moby

    moby Guest

    Or if you feel you need a DDS oscillator, you could always use this one
    :
    http://www.myplace.nu/avr/minidds/
    Which comes with source code (easily hackable to a sweep generator)
    and works like a bought one.
    When I went through this exercise, I went for simplicity: + and - 15
    volt
    supplies, + 5 volt supply all with selectable current limit (I used
    30ma,200ma and 1 amp)
    access pairs of banana sockets with shorting switches to insert current
    meters or external
    PSUs, a few BNC sockets with flying pins to avoid having scope probes
    mucking up the work area, LEDs to let me know when any of the rails
    were current limiting & that's about it.
    Lately the 5 volt supply has sprouted a 3.3 volt option switch.
    M
    M
     
  11. swanny

    swanny Guest

    A couple of big FPGA's and then you can program them to do whatever you
    want to ...
     
  12. I plan to but that will probably be standalone as part of a RF testbed unit
    i want to build

    ....hmm the chip itself is only $26.50 AUD and i've already got the 50MHz
    osc's...

    Why not since i'm putting in a meaty AVR uP probably the Mega32 @ 16MHz and
    a 20x4 LCD and a couple of rotary encoders
    it's basicly software only (and one bleeping small chip, but it cant be any
    worse than those dallas semi tsop's!) after that.

    great i'll just buy a .5mm tip for my Hakko!

    ahh! also use the AVR to give me volt/amp readouts on the p/s
    The rs-232 will go in allong with full breakout box facilitys and a max232
    so i can testbed micro's, but main comm's will be a USB serial module hooked
    to the AVR.

    also bnc, rca, rj-45, and screw terminals

    also use turned pin ic sockets for the connection pins
    The current limiting on the power supplys is something i should have thought
    of (there goes the pc psu idea!) i'll try to set the voltages and curents
    from the AVR via programmable resistors.
    I need to be able to produce a skew in the outputs +/- a volt or so to test
    stability (a fair bit of the stuff i do goes into hostile enviroments)
    very, but i'll probably stick to my variac
    absolutely yes! if i never have to hunt around for one of these again it
    will make the whole thing worth it!
    If i go with the filters i'm tempted to put in a Cypress PSoC, but i dont
    want to learn another uP

    Thank you very much Dave

    The article you did for SC inspired me to play with the ad9835 it's an
    amazing chip!
     
  13. that's a must!, but i'll probably add 3V as well
     
  14. i'll probably use a plug in osc for this then divide using some ttl and the
    micro i'm building in
    the keys i'll probably do as pushbuttons with debouncers (one problem is i
    do a but ov 3V work so i will have to switch logic levels
    i will use a TPIC2802 8 channel driver as i use these often (i bought a big
    box of them for a job that didn't come through)
    i will do these as a multi colour indicator -Volts red, 0V off, 3-5V yellow
    and above 5V green (also add an extra led to each with a 100ms one shot to
    show pulses)
     
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