Electronic Projects, forums and more.

Go Back   Electronic Circuits Projects Diagrams Free > Electronics Forums > General Electronics Chat
transistor as a switch transistor as a switch
Register Blogs Calendar Search Today's Posts Mark Forums Read


General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion?

Reply
Page 4 of 4 < 123 4
 
Thread Tools Display Modes
Old 16th July 2008, 05:59 PM   (permalink)
Default
Quote:
Originally Posted by ahmedragia21 View Post
I just assumed the resistor has about 4V across it

how did you assume that and there's a zero volt in the base ?
im so confused
The emitter of the PNP is connected to +5V. The base will be ≈0.7V below that, or about +4.3V. When the 89S52 output is low, it will be at ≈0.3V. Therefore, the resistor will have ≈4V across it.
__________________
Ron
Roff is online now  
 Reply With Quote
Old 16th July 2008, 11:48 PM   (permalink)
Default
thanks so much
ahmedragia21 is offline  
 Reply With Quote
Reply
Page 4 of 4 < 123 4

Bookmarks

« How do i open a HC49U crystal case? | Gerber files »
Thread Tools
Display Modes
Linear Mode Linear Mode


Similar Threads
Thread Thread Starter Forum Replies Latest
Help with transistor as switch sabotaged General Electronics Chat 7 10th March 2008 04:16 AM
Transistor Switch Digger7 Electronic Projects Design/Ideas/Reviews 14 7th June 2007 03:12 PM
Transistor Switch.... NJ Roadmap General Electronics Chat 9 21st April 2007 12:37 PM
Using a transistor as a switch Mike18 Electronic Projects Design/Ideas/Reviews 3 28th February 2004 12:22 PM
Transistor switch hantto General Electronics Chat 6 26th April 2003 01:53 AM



All times are GMT. The time now is 08:05 PM.

Electronic Projects Circuits Diagrams - Archive - Top

Electronic Circuits  |  Electronics Wiki
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.