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.

Looking for simple light detector circuit

Status
Not open for further replies.

sangkeetha

Newbie level 4
Newbie level 4
Joined
Jan 15, 2006
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,334
simple detector circuit

hi,

i would like to construct a simple optical sensor.And for that, i need a simple design of a light detector circuit, using pin photodidode as the detector, with model spec.

thanx.
 

Re: simple detector circuit

You can probably go to a local Tandy-Radio Shack store and see what they have. Then build an OP AMP circuit with the diode between the inverting input and grould, the noninverting input grounded and a large resistor between the output and the inverting input. Have the diode in the direction so that on the schematic the cross bar of the diode symbol is towards the inverting input.

The light will cause the diode reverse current to flow and it will try to be removed from the inverting terminal. The op amp output will go positive to supply an equal current through the resistor between it and the inverting input.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top