External Power Suppy - Nikon Coolpix 5700

Discussion in 'Nikon' started by Donald Gray, Oct 22, 2003.

  1. Donald Gray

    Donald Gray Guest

    I am interested in making a regulated (stabalised) external power
    supply for my 5700 which needs 8.4 volt input.

    Can anyone help with a suitable circuit?

    (Source Voltage probably 9 or 12v)

    Tks
    --
    Donald Gray
    Putting ODCOMBE on the Global Village Map!
    www.odcombe.demon.co.uk
    You do not have to email me, but if you wish to...
    Please remove the SafetyPin from my email address first
    Thanks
     
    Donald Gray, Oct 22, 2003
    #1
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  2. Donald Gray

    Donald Gray Guest

    Forgot to ask...

    Does anyone know the voltage latitude and current needs of the 7500?

    Almost forgot... Please!
    Thank you
    --
    Donald Gray
    Putting ODCOMBE on the Global Village Map!
    www.odcombe.demon.co.uk
    You do not have to email me, but if you wish to...
    Please remove the SafetyPin from my email address first
    Thanks
     
    Donald Gray, Oct 22, 2003
    #2
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  3. Donald Gray

    Donald Gray Guest

    Olin,
    Thanks for the comments and the offer.

    In reality, I was being very lazy and hoping someone had such an
    instant circuit - hence my enquiry. I didn't want to re-invent the
    wheel. (It is 10 years since I did any design work & homebrew!)

    Last night, I decided to reinvent it and have designed a voltage
    regulator - stabiliser based on the LM371 which has an Imax of1.5A

    The output volts (Vout) is dependant on the ratio of two resistors, R1
    & R2, being used to set up the reference voltage. The formula being:-

    Vout=((R2/R1)+1)*1.25

    So, for my needs (8.4v), R2=4k7 & R1=820R which gives 8.41v

    Note: the source (input) voltage should be at least 2.5v higher than
    the Output voltage. That suits a (nominal) 12v source

    The cost of the stabaliser project is about 5 UKpounds, say 6-8 USD

    If anyone is interested, I have done the calculations to give
    stabiliser voltages from 1.9 volts to 27.2 volts utilising standard
    (E24) series resistors, I will email a copy. It is in an Excel
    spreadsheet format. (Don't forget to remove the safetypin from my
    email addy)

    I am assembling the few components and once completed, I will write it
    up and publish the info for anyone interested in having external
    battery power.

    Regards to all



    [snip]--
    73s OM
    Donald G3YPL/exZL1AZC
    Putting ODCOMBE on the Global Village Map!
    www.odcombe.demon.co.uk
    You do not have to email me, but if you wish to...
    Please remove the SafetyPin from my email address first
    Thanks
     
    Donald Gray, Oct 23, 2003
    #3
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