I want to design very very small 6V power supply @100mA - Electronic Circuits Projects Diagrams Free

nikhil arora · 21st June 2006, 11:02 AM

i have little idea that this can be done by two methods
1> Tansformerless design
2> Switching power supply design

now i want to have very small transformer or no transformer at all

audioguru · 21st June 2006, 11:58 AM

I answered you in your same post on the other site.

Hero999 · 21st June 2006, 01:54 PM

Please provide a link for other people who don't visit the other site.

audioguru · 21st June 2006, 03:00 PM

He posted his question here first:
http://www.electronics-lab.com/forum...cseen#msg43869

nikhil arora · 22nd June 2006, 07:56 AM

sorry audio guru but i was searching for more ideas

And by this act I have got a different ideas:
1> Transformer less design explained on microchip website and other sites too.
2> Using ready-to-use modules from http://www.rohm.com

So i was looking for different views and different ideas
as there are very less people who visit many forums some gurus are helping at one forum only.........

audioguru · 22nd June 2006, 01:30 PM

[quote=nikhil arora]there are very less people who visit many forums.[quote]
I don't visit forums in your country.

panic mode · 22nd June 2006, 11:20 PM

so what do you want to use as power source to feed this power supply?
AC outlet? battery? car battery? solar cell?

nikhil arora · 23rd June 2006, 06:20 AM

input will be 220V 60hz ac outlet and i want to convert it into 6V 100mA DC in smallest possible space

**Nigel Goodwin** · 23rd June 2006, 08:20 AM

Quote:

Originally Posted by nikhil arora

input will be 220V 60hz ac outlet and i want to convert it into 6V 100mA DC in smallest possible space

You still haven't said what it's for? - which is rather crucial to the design possibilities!.

motion · 23rd June 2006, 08:45 AM

Quote:

Originally Posted by nikhil arora

input will be 220V 60hz ac outlet and i want to convert it into 6V 100mA DC in smallest possible space

If someone told you how, you can't take credit for it now, would you?

Try this link to ON Semi off line regulator IC's. It's got most everything you need in a SOT-223 package.

http://www.onsemi.com/pub/Collateral/NCP101X.PDF

nikhil arora · 28th June 2006, 07:28 AM

The supply is for a new switch which will be placed instead of regular on/off switch for appliance, switch consists of proximity sensor so when a finger or hand comes near the switch toggles this is how the switch work so you don't have to touch the switch to making things on and off.

Now you must be aware how small are these switches so in that space i have to provide sensor and control electronics and power supply.

catcat · 29th June 2006, 03:37 PM

What exactly is a switching power supply?

**Nigel Goodwin** · 29th June 2006, 03:45 PM

Quote:

Originally Posted by catcat

What exactly is a switching power supply?

A switch-mode power supply, just another name for it!.

audioguru · 29th June 2006, 03:51 PM

A switching power supply uses a high frequency so its transformer or inductor can be small. They usually switch their pass transistor fully on and fully off to avoid wasting power as heat like a linear regulator does. Then the width of each pulse can be changed to regulate the output voltage by using Pulse-Width-Modulation.

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21st June 2006, 11:02 AM	(permalink)
nikhil arora	I want to design very very small 6V power supply @100mA i have little idea that this can be done by two methods 1> Tansformerless design 2> Switching power supply design now i want to have very small transformer or no transformer at all __________________ MSc Electronics Unexperienced ;-)

21st June 2006, 11:58 AM	(permalink)
audioguru	I answered you in your same post on the other site. __________________ Uncle $crooge

21st June 2006, 01:54 PM	(permalink)
Hero999	Please provide a link for other people who don't visit the other site. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

21st June 2006, 03:00 PM	(permalink)
audioguru	He posted his question here first: http://www.electronics-lab.com/forum...cseen#msg43869 __________________ Uncle $crooge

22nd June 2006, 07:56 AM	(permalink)
nikhil arora	sorry audio guru but i was searching for more ideas And by this act I have got a different ideas: 1> Transformer less design explained on microchip website and other sites too. 2> Using ready-to-use modules from http://www.rohm.com So i was looking for different views and different ideas as there are very less people who visit many forums some gurus are helping at one forum only......... __________________ MSc Electronics Unexperienced ;-)

22nd June 2006, 01:30 PM	(permalink)
audioguru	[quote=nikhil arora]there are very less people who visit many forums.[quote] I don't visit forums in your country. __________________ Uncle $crooge

22nd June 2006, 11:20 PM	(permalink)
panic mode	so what do you want to use as power source to feed this power supply? AC outlet? battery? car battery? solar cell?

23rd June 2006, 06:20 AM	(permalink)
nikhil arora	input will be 220V 60hz ac outlet and i want to convert it into 6V 100mA DC in smallest possible space __________________ MSc Electronics Unexperienced ;-)

28th June 2006, 07:28 AM	(permalink)
nikhil arora	The supply is for a new switch which will be placed instead of regular on/off switch for appliance, switch consists of proximity sensor so when a finger or hand comes near the switch toggles this is how the switch work so you don't have to touch the switch to making things on and off. Now you must be aware how small are these switches so in that space i have to provide sensor and control electronics and power supply. __________________ MSc Electronics Unexperienced ;-)

29th June 2006, 03:37 PM	(permalink)
catcat	What exactly is a switching power supply? __________________ OK, Who put the LED in backwards?

29th June 2006, 03:51 PM	(permalink)
audioguru	A switching power supply uses a high frequency so its transformer or inductor can be small. They usually switch their pass transistor fully on and fully off to avoid wasting power as heat like a linear regulator does. Then the width of each pulse can be changed to regulate the output voltage by using Pulse-Width-Modulation. __________________ Uncle $crooge