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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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Thread Tools | Display Modes |
25th May 2004, 10:42 AM
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Experienced Member
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Voltage Regulators - How do they know...?
Hi.
I have question about voltage regulators. How do they know what voltage to 'provide'. For example, a 78L05 gives 5v from a 9v-30v input (or something similar), or so I have heard. If this is true, how does it know what voltage to drop it down to? I would have though it would need a reference point, the only reference point avilable being the input, which can vary. How does it accurately provide the right voltage? Thanks Tim |
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25th May 2004, 10:47 AM
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Experienced Member
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They use a zener diode inside such devices. Do a google search to learn more about zeners
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25th May 2004, 10:51 AM
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Experienced Member
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well, just like with a zener diode, you can get one output voltage with an input voltage that is between a range.
internally, it is set up to put out 5V (7805). |
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25th May 2004, 02:22 PM
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Experienced Member
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oh, ok, hadn't thought of that.
thanks. Tim |
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