I'm just wondering if i can add a USB connection to the circuit so i can either use an external OR USB supply for my +5V output. Would the regulator circuit be ok like this or would i need to stop current flowing back to the regulator if it's USB powered ?
I'm just wondering if i can add a USB connection to the circuit so i can either use an external OR USB supply for my +5V output. Would the regulator circuit be ok like this or would i need to stop current flowing back to the regulator if it's USB powered ?
Yes, you need to prevent feeding back. This is just one diode AFAIK.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.
I'm just wondering if i can add a USB connection to the circuit so i can either use an external OR USB supply for my +5V output. Would the regulator circuit be ok like this or would i need to stop current flowing back to the regulator if it's USB powered ?
Yes, you need to prevent feeding back. This is just one diode AFAIK.
A diode will cause a voltage drop though. Even a Schottky will lose a couple of tenths or more, so this may affect the performance of your device.
Anything seems possible when you don't know what you're talking about.
I had a feeling i'd need to do something with this with a diode of some type which leads to one more question... Diode types ?
The protection diode is a 1N4007.
I need to order some diodes, before i do is there any other 'information' anyone would like to add, formula's, calculation's and just a little background as to how & why it's that diode type please.
I don't want to just add the diode and say 'yes it works', i'd like to have a bit more of an understanding of the how and why it works as well... i'd like to learn more !!! (never said that a school) 😉
I'm just wondering if i can add a USB connection to the circuit so i can either use an external OR USB supply for my +5V output.
Your question is not so much a parallel power supply problem but a dual power supply problem.
Well the Arduino developer board can use either and switches automatically between power supplies see above links to how it is done.
The voltage drop mentioned for a diode can be reduced by using p channel mosfet zero loss diode equivalent.
Components have current and/or voltage limitations so it is a matter of looking at the specs for the various components.
ReplyQuote
We use cookies on the DroneBot Workshop Forums to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
