Home Community

2n2222 resistor value
Welcome, Guest. Please login or register.
April 18, 2014, 06:11:53 AM
Home Help Search Calendar Login Register
News: trade your components on this new board: "Components trade"

Advertisements
No New Posts
Today at 01:39:33 AM
in
Advertisements
by google

+  Electronics-Lab.com Community
|-+  Electronics Forums
| |-+  Electronic Projects Design/Ideas (Moderators: Dazza, gogo2520, Herman the German)
| | |-+  2n2222 resistor value
« previous next »
Pages: [1] Print
Author Topic: 2n2222 resistor value  (Read 914 times)
eplanet
Sr. Member
****
Gender: Male
Posts: 469


Take localy start globaly


View Profile
« on: February 15, 2012, 12:56:07 PM »

hi friends
please show me how can i calculate resistor value  connected to base of 2n2222?
thanks
Logged

Hero999
Global Moderator
Electronics God
*****
Posts: 2554



View Profile
« Reply #1 on: February 15, 2012, 01:35:51 PM »

Assuming Vcc is the same as the voltage powering the MCU, as a general turle of thumb, make the base resistor 10 times the value of the relay's coil resistance.
Logged

I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question: if I know the answer, I'll be happy to help.

eplanet
Sr. Member
****
Gender: Male
Posts: 469


Take localy start globaly


View Profile
« Reply #2 on: February 15, 2012, 01:57:02 PM »

thanks hero999
is there any formula for this issue?
my coil is 57ohm
Logged

Pages: [1] Print 
« previous next »
Jump to:  

Advertisements
No New Posts
Today at 01:39:33 AM
in
Advertisements
by google


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!

 

 

Search Site | Advertising | Contact Us
Elektrotekno.com | Free Schematics Search Engine | Electronic Kits