Timeline for Simple circuit design : USB in | 4v out [duplicate]
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Aug 15, 2017 at 15:50 | history | closed |
Chris Stratton PeterJ winny Voltage Spike♦ Dmitry Grigoryev |
Duplicate of Reducing voltage with resistors | |
| Aug 14, 2017 at 1:41 | answer | added | Heath Raftery | timeline score: 0 | |
| Aug 14, 2017 at 1:22 | comment | added | Finbarr | You could combine enough in parallel to get 0.45 or you could buy one the right value to start with, they're not hard to find. Bear in mind that it'll dissipate over 2W and get hot. | |
| Aug 13, 2017 at 23:26 | comment | added | Furrane | Thanks for the feedback guys. AliChen the 2A I'm talking about is coming from a USB powering station (not the usb port of a computer). Finbarr I got some resistors and most of them are in the 100 to 100k ohms range so I don't know how I could reach .45 | |
| Aug 13, 2017 at 22:48 | review | Close votes | |||
| Aug 15, 2017 at 15:50 | |||||
| Aug 13, 2017 at 22:30 | comment | added | Chris Stratton | At these power levels, you want a switching regulator or to re-wind the coil for the input voltage. But your load exceeds USB specifications, so it's not clear how you intend to achieve your goal anyway. | |
| Aug 13, 2017 at 22:15 | comment | added | Finbarr | And in any case, if you want your circuit to put 5V across your 1.8 Ohm load that's a current of 2.77A. You're going to need one of those magic Tesla generators I keep getting emails about. | |
| Aug 13, 2017 at 22:10 | comment | added | Ale..chenski | And why do you believe that a[ny] USB connection is rated for 2 A ? | |
| Aug 13, 2017 at 22:04 | comment | added | Finbarr | Why don't you think 0.45 Ohm is easily achievable? | |
| Aug 13, 2017 at 21:48 | history | asked | Furrane | CC BY-SA 3.0 |