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Posts posted by msilveira

  1. I read as much information as I found on the internet about UV rays.... and found interesting the possibility to use UV leds replacing those big lamps to build an EPROM eraser ... A "Pocket EPROM eraser"...

    But as I'm not an specialist, I'm posting this topic to ask: Is it really possible to use these UV leds to build an eprom eraser?

    1.) Small size
    2.) Exposure timer (555?)
    2.) If there's a TTL replacement for 555, would a CR2032 battery do the job? Anyway, a rechargeable battery could be used, in this case, a 5v battery would be used, allowing the use of a 555 IC.

    There's a need to study the focus too... the led should light the whole EPROM window.

    Write down any other ideas for the project.

    This page
    has some UV Led specs(not a datasheet)...
    and this is a datasheet (any better UV Led datasheet link?) http://www.marktechopto.com/PDFs/Cotco/LC503MUV130P_040708.pdf

    That's all for now :)

  2. Audioguru, give us some hints about this, please :) :


    I like your web site.
    I'm interrested about 0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL 0.002-3 A and have couple of questions.
    Is it possible to increase output current to 5 Amps ? (adding 2N3055 and changinging some component values)
    Can I built 2 similary power supply and use it in serial mode 0-60 V or in parallel mode to get more current 0-10 Amps or use it like dual power supply +/-
    30 V ?

    Thank you



    Hi all, I'm new to the EL forums, but not new to the website, nice stuff here  :D

    As Tom said, I'd be interested on building a bipolar PSU unit with the capabilities of this project. I still have to read all the threads, I have read something about fixing the original design among the posts(so many!)...

    Right now, I have a 3-wire trafo, 28+28 (really 28+0+28) over my table... but it's just 1A...
    I was wondering: If I found a 28+0+28 (or with a little higher voltage), what current should it be: 3A or 6A?

    What changes should it have to operate bipolarity?

    You know, many experiments requires bipolar feeds...

    I would be interested in adding parallel LM7(8/9)0(5/6/9/12/whatever)s or LM3(1/3)7s for extra fixed voltages...

    I still have much left to learn indeed... but for now, my knowledge allows me to provide good shcematics/pcb design, maybe we could open another topic: "[glow=red,2,300]30-0-30 VDC BIPOLAR STABILIZED PSU[/glow]" ??? Then we could adapt the changes of the 5A topic to the bipolar one to become a bipolar 5A PSU ???

    All that is left for my improvement idea is a button to make it speak the current and voltage instead of displaying with the digital meter presented ;D (Just joking!)

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