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Author Topic: 7805 and AC-Adapter  (Read 1602 times)
The_YongGrand
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« on: December 16, 2009, 10:07:49 AM »
Hey there,

I'm building an electronic circuit which contains a 7805 voltage regulator, rated at 1A output.

However, my AC Adapter has a rating of 1.5A output which will be connecting to the input of the 7805.

Could that burn the regulator, or the circuit?  Roll Eyes
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Hero999
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« Reply #1 on: December 16, 2009, 12:54:00 PM »
Sorry but if you need to ask this then you probably need to do some more learning before you build your own regulator circuit.

I suggest doing a bit more research.
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audioguru
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« Reply #2 on: December 16, 2009, 03:18:10 PM »
The battery in my car can supply up to 750 Amps to the starter motor when it is very cold. But the 7805 regulator that is my cell phone charger doesn't care. The 750A battery is connected directly to the input of the 7805.

The interior light in my car is also connected directly to the 750A battery when it is turned on. It doesn't draw 750A!

My home has electrical power up to 200A.
My night light is connected directly to it but it doesn't draw 200A!

Why would a 1A regulator draw more than only 1A?
Actually it might. Its typical max output (and input) current is 2.2A.
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Alex Tsekenis
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« Reply #3 on: December 17, 2009, 05:51:40 AM »
I assume you can learn the thory somewhere else, so to summarise what has been said, no you will not burn your regulator because your trafo is 1.5A rated, assuming your circuit uses less than 1.5A.
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Hero999
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« Reply #4 on: December 17, 2009, 07:09:20 AM »
I'd recommend using a 1.5A transformer in a 1A regulator circuit.

The next question will probably be: "I've built the circuit using a 6VAC adaptor but the output voltage drops when a 1A load is connected. What's wrong?"
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Alex Tsekenis
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« Reply #5 on: December 17, 2009, 07:16:09 AM »
Quote from: Hero999 on December 17, 2009, 07:09:20 AM
The next question will probably be: "I've built the circuit using a 6VAC adaptor but the output voltage drops when a 1A load is connected. What's wrong?"

 Keep your patience Hero. Grin
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eduard0476
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« Reply #6 on: January 19, 2010, 08:03:43 AM »
don't worri Bro that is not burning. do it...
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Stephenah
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« Reply #7 on: April 20, 2010, 03:30:02 AM »
Quote from: eduard0476 on January 19, 2010, 08:03:43 AM
don't worri Bro that is not burning. do it...

+1 Cheesy
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