Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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

Problem with offset value with IR transmitter

Status
Not open for further replies.

Miltaridis

Newbie level 6
Joined
May 21, 2011
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
Xanthi GR
Activity points
1,378
I am trying to drive 3 ir leds from an ic using the following schematic :


This seemed to work for a while but at my receiver i am getting a strange offset value as if the transistor cant turn the led's truly off at any time. Any ideas ?

I tried with another trasmitter and the receiver works fine
 

davenn

Advanced Member level 3
Joined
Jul 1, 2009
Messages
844
Helped
192
Reputation
384
Reaction score
163
Trophy points
1,323
Location
Sydney, Australia
Activity points
6,381
Re: Ir transmitter help!

it mite help to have a 1k resistor in the base cct of the transistor :)

Dave
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top