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Thread: Need some electronics help

  1. #1
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    Need some electronics help

    Im making my IR receiver right now, I was supposed to get a 100mA 5V regulator. But I could on find a 1A 5V reg
    http://www.radioshack.com/product.as...%5Fid=276-1770

    will this still work?

  2. #2
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    come on where are the EE's? :T

  3. #3
    Constant Bitrate bluehcc's Avatar
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    1A 5V is more than enough, there is no regular that's rate for that little current.

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    It will work just fine.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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    Exclamation 1 amp could end up roasting it

    What is it for? 1000Ma or 1 amp could end up roasting it depending on what it is.

    Squid has a nice regulator circuit HERE that I have used extensively for my PSU needs and it works great mine is set at 9 Volts (adjusting R2) and 200Ma (Via R1) and yes you can go that low in amps.

    In the schematic you would need to replace R1 with a resistor rated at 1 watt and the value would need to be some where between 9 and 10 Ohms to output 100Ma use a multimeter set to DC AMPS to ensure it is really outputing 100Ma or close to it.
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  6. #6
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    its for my IR receiver
    they didnt have 100mA 5v so I figured I should get the 1A 5V and see what you guys think.
    heres the schematic if it helps anyone come to a conclusion for me:
    http://www.lirc.org/images/schematics.gif

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    Quote Originally Posted by Deviser
    What is it for? 1000Ma or 1 amp could end up roasting it depending on what it is.
    It shouldn't, unless I've got my electronics mixed up. The voltage is akin to water pressure. Essentially, how fast the power can move. The amperage is the amount of electricity that COULD move, kind of like the diameter of the hose.

    In this case, 1 amp is not how much power moves when you hook it up. It's the maximum that COULD be supplied if the electrical device demanded it. In this case, it only needs a very small amount of power.

    It won't fry it. What would fry it is if you got the wrong voltage, not amperage.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    yes that sounds right, but if the amps are too high will i need to provide more power? using the anology it like using a huge pipe for a few drops off water. would it matter?

  9. #9
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    This type of circuit is getting power from the serial port so you are only dealing with MA in this case.

    The circuit I showed you does not apply to this.
    You may be able to use the a standard 7805 or you can order what is shown in the schematic and any other parts you may need from Mouser HERE or Digikey
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    HU-Alpine CDA-7897 Fantom Face XL AM/FM CD/MP3 Receiver.

  10. #10
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    You should be able to buy the 78L05 regulator everywhere. If you can't find any place that sell them, PM me your address I'll send you one for free only if you are in the States. I bought a bag like 5 or 6 of them for a buck 50 and only use 2 or 3.
    I am not sure if you can use 7805 because the serial port may not be able to supply enough power for it.
    Your other option is check this guy out http://www.cesko.host.sk/. He is the author of the plug in you are going to use with Girder. He use a 5.1Volt zender diode instead of the 78L05. His circuit and the LIRC circuit is very similar.
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