Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Making switching NPN with PNP

Status
Not open for further replies.
C

crazybuoy

Junior Member level 2
Joined
Jun 24, 2010
Messages
21
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,283
Activity points
1,435
There is a small circuit schematic attached where I am using voltage regulator 7812. I input 24VDC and 12VDC comes out from OUT pin. I want to make switch off & on NPN transistor with 12VDC buy using PNP transistor before NPN. And I will use PC printer port to provide the 1 & 0 pulse of 5VDC then how I should wire the circuit I want to just get the idea. Or is there any other way to do the same?
 

Attachments

  • Switching PNP.JPG
    Switching PNP.JPG
    16.3 KB · Views: 113
Last edited:

It can be done by driving the PNP via a 7V zener diode, as shown on the attached picture, or you can consider an optocoupler instead of the PNP+zener ..

IanP
:wink:
 

Attachments

  • Switching%20PNP2.jpg
    Switching%20PNP2.jpg
    25.8 KB · Views: 113

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top