Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

L + C for digital circuits

Status
Not open for further replies.

8899

New Member
Hi All,

Should I put the inductor (47uH) before or after the voltage regulator? Which one is better?

After the regulator
(+9V) - 22uF - 7805 - 22uF - 47uH - 22uF - Vcc +5V

Before the regulator
(+9V) - 22uF - 47uH - 22uF - 7805 - 22uF - Vcc +5V

TIA!! :D
 
What's the inductor for? You have an excellent voltage regulator and decoupling capacitors.
Inductors are used before a regulator and its input cap but after the main smoothing cap if the supply to it has wild voltage fluctuations. If you are using a little 9V battery then its voltage won't swing wildly and an inductor isn't necessary.

A 7805 needs an input voltage of about 7V to 8V and won't work when the 9V battery's voltage runs down to 6V during its life. I use an LM2931AZ 5.0 low-dropout regulator for all my 9V battery applications because it still regulates with an input voltage of only 5.4V.
 
As Audioguru says, what's the inductor for?.

The only place I've seen them used is before the regulator, but ONLY on switch-mode PSU's - on a conventional PSU or a battery, the value is FAR too low to do anything.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top