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

Need your help about LDR

Status
Not open for further replies.
W

Waqas Rafiq

Newbie level 1
Joined
Jan 20, 2011
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,288
hey all,
I want to use LDR with laser i just wanted to know if there is any LDR which can tolerate the laser beam and also which laser is appropriate to use with LDR???
plz help me as soon as possible......
 

You can start up with any easily available LDR. Not to worry about this.....Basically LDR are selected according to their resistance values in full Dark and Bright Light environment. Say an LDR have resistance of 10M in dark and it becomes 10K in bright light (10-20kOhm @ 10 lux, 2-4kOhm @ 100 lux).
The circuit below is useful to you. The 10K variable resistor will actually decide the threshold that on how much light fall on LDR, the LED should light up.
74_1295525027.jpg


---------- Post added at 13:08 ---------- Previous post was at 13:06 ----------

Adjust this resistor such that LED is ON only for LASER and not for normal illumination....
 

The LDR is capable of tolerating a toy laser beam. By the way there are quite a lot lasers and you didnt mention which one you are using. But any LDR should cost a penny and its worth trying it out and posting the results. DIY :smile:
 

Lots of product specifications and other information here: **broken link removed**.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top