How I design this circuit?

Surely has to be a troll.

In case it's not, the student should examine the power available from a USB port, and the power required to toast things, and then find a different project.

Sylvia.

Can't you power it from the cloud?

On Mon, 21 Mar 2016 11:04:45 +0000 (UTC), KeJia Gave us:

Use about 400 supercaps or a motorcycle battery and a hand crank generator that you crank for several minutes before use mounted on the end of the unit. Crank and repeat several times to actually get a single two slice toast session to complete. A USB spec port simply cannot do it without an overnight charged motorcycle battery in the mix.

IOW, somebody is pulling your leg... And it isn't me.

On Mon, 21 Mar 2016 11:14:29 +0000, John Devereux Gave us:

Wouldn't that stand his hair on end?

It might be a real project option devised by a member of the teaching staff who ought to know better.

Sylvia.

... Phil

On Mon, 21 Mar 2016 22:32:02 +1100, Sylvia Else Gave us:

Or wants to cull out someone. Perhaps it is the teacher who failed to learn something. I think that goes a bit past "should know better".

Probably the easiest way is to find an old RS232 toaster on ebay and use a USB converter.

Cheers

On Mon, 21 Mar 2016 04:33:44 -0700 (PDT), Phil Allison Gave us:

Does not sound very appealing to the pallet..

Maybe with a 4 foot fresnel and a sunny morning (focused) on the side... (of the toaster)

Use the usb to over charge a Lipo, when it catches on fire, hold the bread over the flames... it may not be safe for human consumption. :^)

George H.

step-and-repeat

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Good one !! ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Toasting the USB, and more, is described here:

but you will probably need google translate to convert it to Chinese (traditional)

Use a 555 or a PIC.

Why is this a bad teaching project? It would require creative thinking and evaluation of multiple parameters and possible circuits to see what would work the best.

Or said another way for someone whose first language is not English, a USB connector does not have enough power available to toast bread.

However, Calvin and Hobbes might have a different theory.

Mikek

There's an app for that.

Powered from USB, or just controlled by it?

But in either case, why?

What would you toast? Have things like frozen waffles and English muffins become popular in China?