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connection problem for infared photo detector circuit

 
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vyili



Joined: 14 Mar 2007
Posts: 1
Post14 Mar 2007 7:22   connection problem for infared photo detector circuit
i wish to connect a circuit as circuit as shown below.

i have connect it but it not work. the voltage comparator i use is LM311. i connect the output to pin7, pin 4,5,6 not use. pin 2 & 3 is connect as the circuit shown.
other than this, the irled im using is get in pair, both have 2 pin. but its not work.
i also try use a 2 pin phototransistor, but it also not work.

can some one pls help?
THanks a lot.
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Jepeto



Joined: 09 Oct 2006
Posts: 108
Helped: 9
Post24 Mar 2007 10:43   Re: connection problem for infared photo detector circuit
PIN 4 -V must to connect to GND (-)
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wichayen



Joined: 31 Jan 2007
Posts: 46
Helped: 3
Location: Thailand
Post28 Mar 2007 10:21   connection problem for infared photo detector circuit
If you correctly connect circuit.
1.Try to connect LM311 output with transistor. Use transistor to drive LED.
2. Change R1 value (actually you have to know photo-transistor gain). More easier you can try to change R1 biger than 1M or lower than 330k. But I think you should try to change biger than 1M.
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