Home Community

 Pages: [1]
The_YongGrand
Newbie

Posts: 10

 « 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?
 Logged

Hero999
Global Moderator
Electronics God

Posts: 2473

 « 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.
 Logged

I also post at:
http://www.silicontronics.com

I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question: if I know the answer, I'll be happy to help.

audioguru
Electronics God

Gender:
Posts: 14206

I'm a theory expert! \$crooge and I are thrifty.

 « 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.
 Logged

Alex Tsekenis
Sr. Member

Gender:
Posts: 279

 « 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.
 Logged

Regards,
Alex

Disclaimer: All content of my posts is intended for educational use only. Although the information is given in good faith, if you or any third party attempts to implement any content from my posts or posts related to mine in any way, you agree that you do so by accepting full responsibility for your actions. I will not be held liable in any way for any consequences or damage, direct or indirect, caused by your actions.

Hero999
Global Moderator
Electronics God

Posts: 2473

 « 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?"
 Logged

I also post at:
http://www.silicontronics.com

I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question: if I know the answer, I'll be happy to help.

Alex Tsekenis
Sr. Member

Gender:
Posts: 279

 « Reply #5 on: December 17, 2009, 07:16:09 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?"

 Logged

Regards,
Alex

Disclaimer: All content of my posts is intended for educational use only. Although the information is given in good faith, if you or any third party attempts to implement any content from my posts or posts related to mine in any way, you agree that you do so by accepting full responsibility for your actions. I will not be held liable in any way for any consequences or damage, direct or indirect, caused by your actions.

eduard0476
Newbie

Posts: 13

 « Reply #6 on: January 19, 2010, 08:03:43 AM »

don't worri Bro that is not burning. do it...
 Logged

Stephenah
Newbie

Gender:
Posts: 8

 « Reply #7 on: April 20, 2010, 03:30:02 AM »

don't worri Bro that is not burning. do it...

+1
 Logged

sing more fashion things

 Pages: [1]
 Jump to: Please select a destination: ----------------------------- Electronics Forums ----------------------------- => Projects Q/A => Datasheet/Parts requests => Electronic Projects Design/Ideas => Power Electronics => Service Manuals => Theory articles => Electronics chit chat => Microelectronics ----------------------------- Related to Electronics ----------------------------- => Spice Simulation - PCB design => Inventive/New Ideas => Mechanical constructions/Hardware => Sell/Buy electronics - Job offer/requests => Components trade => High Voltage Stuff => Electronic Gadgets ----------------------------- General ----------------------------- => Announcements => Feedback/Comments => General