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Type: Posts; User: fixit7

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  1. Closed: Re: Runtime of clock using alkaline D cells instead of AA batteries

    Thanks for all the responses. They helped.

    :-)
  2. Closed: Re: Runtime of clock using alkaline D cells instead of AA batteries

    Ok, I found the data sheet. I see the capacity is 15,000 Mah.

    155618

    So, according to the table, if a device using 120 Mah, it would last about 80 hrs.

    Since the clock uses 30 Mah, that...
  3. Closed: Re: Runtime of clock using alkaline D cells instead of AA batteries

    I assume that Time(H) = Capacity(Ah)/Current(A) equals a final battery voltage of 0 volts which will not work in my case.

    I need a calculation for an ending voltage of around 2.0 volts.
  4. Closed: Runtime of clock using alkaline D cells instead of AA batteries

    I have a wall clock that uses 2 AA batteries.

    I would like to use a transformer, but I get frequent power outages.

    The clock uses about 30 mAh.

    It lasts about 2 months before it starts...
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    Closed: Re: Forward voltage of blue 3 mm led

    Thanks for all the help.

    My voltage source is 3 volts. Will I need a resistor in the circuit?

    Thanks,

    Andy
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    Closed: Re: Forward voltage of blue 3 mm led

    Thanks, I will do that.
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    Closed: Re: Forward voltage of blue 3 mm led

    The voltage is 3.7 volts for the 18650.

    I have a wall power source that outputs 3.6 volts that I will probably use.
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    Closed: Re: Forward voltage of blue 3 mm led

    I have no data sheet.
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    Closed: Forward voltage of blue 3 mm led

    I have this package of 30 3 mm blue leds.

    I do not recall where I bought them.

    The pic shows one of them powered by a 18650 battery.

    I was wondering what the forward voltage is?

    154948
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    Ok, thanks.

    Running it now on 9 volts.

    :-)
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    So, what kind of additional attention should I give to the 12 volt led?
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    I have some 30 gauge un-insulated wire.

    Will that do?





    If the heat does not affect the component life, then I can accept the heat.
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    Are you saying that if I replace it with a 1K resistor, it will not get as hot?
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    It is not in a circuit.

    Resistor show is 510 ohms.

    154885

    [found at: imgur. com /a /bV07ys8]
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    [SOLVED]Closed: 12 vdc led running very hot

    I bought some 12 VDC 5 mm red leds.

    They work find but...

    when I touch the wires going into the led, they were hot enough that I had to remove my hand.

    That does not seem normal.
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    Closed: Re: Minimize effect of IR bulbs on image

    Do you have a link to those?

    Thanks.
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    Closed: Re: Rebuild low end computer speakers

    I am trying to find a ready made speaker system that includes woofer, mid range and tweeter speakers.

    No luck so far.

    Just systems with a sub-woofer ?
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    Closed: Re: Rebuild low end computer speakers

    I need help finding a place that sells it.
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    Closed: Re: Rebuild low end computer speakers

    Could you or someone help me find

    this part I will need ?

    2.55mH Inductor
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    Closed: Rebuild low end computer speakers

    I bought some Inland Pro Sound 2000 speakers from a thrift store.

    It is an amplified system putting out about 7 watts.

    They sound pretty poor.

    I remember making my own 8 ohm speakers years...
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    Closed: Re: Replaced NiMh battery in small solar light

    The 2.02 volts is without the battery.
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    Closed: Shielded-Power-Transformer

    I am trying to sell this. It was salvaged from a Yamaha receiver.

    I was told it was a shielded power transformer. If it is not, I would appreciate knowing what it is.
    ...
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    Closed: Re: Minimize effect of IR bults on image

    There is no remote.

    Just a basic wired system. (720p B/W)

    Opening the blinds a little helped.
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    Closed: Minimize effect of IR bulbs on image

    The IR bulbs are great for nighttime surveillance but not really needed when there is ample light.

    As you can see, in this image the IR light is reflecting off the blinds.
    ...
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    Closed: Re: Replaced NiMh battery in small solar light

    Ok, so no Chinese batteries.
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