IR reciever

[Dr_Doggy]

this is an IR receiver circuit that filters the 40khz?

what if my IR detectors are only 2 pin, could I still use a circuit similar to this?

 

[Reloadron]

Yes, the module you linked to is an IR detector circuit designed to receive IR data (pulses) modulated on a 40 KHz carrier. It demodulates the carrier and outputs the data pulses. Thus filters out the carrier frequency.

Yes, you would just build a circuit to demodulate the carrier.

Ron

 

[Dr_Doggy]

would this one work? (the diode is my photo-diode-sensor-QSE113)
should I reverse my photo-diode and R1?
what do I value my capacitors for the 40khz carrier?

thnx!

 

[Dr_Doggy]

EDIT : ATTACHMENT FOR last post!!!!

 

[audioguru]

A photo-diode has an extremely low output level. An IR detector IC has a high gain amplifier inside plus a lot of things to prevent interference from compact fluorescent light bulbs and sunlight.

Your photo-diode is forward-biased so it is turned on all the time and will not detect IR nor light.
It should be reverse-biased so that IR or light causes it to conduct a little. It can also be used with no bias like a tiny extremely low output solar cell.

 

[Dr_Doggy]

yes, thank-you, I realize, i am stuck with these diodes for now, but my main concern is the values for the capacitors to filter properly, what sizes should i use....and my resistor too???

the series cap is my high pass, and the parallel cap is my low pass,no? they will help reduce the noise i am hoping?

 

[audioguru]

The capacitors reduce noise almost as much as they reduce your signal.

 

[languer]

Perhaps you could elaborate more on what you are trying to do. It looks like you're trying to replace the GP1U5x with a QSE113. The GP1U5x receives the IR signal, conditions and demodulates the 40kHz signal. The QSE113 only receives the IR signal (you have to take care of the conditioning and demodulation - if this concerns you).

 

[Dr_Doggy]

yes presactly, i need to take care of demodulation, i got stuck with the photodiodes, my best guess to do this was to add a series capacitor to filter the DC(and only accept the 40khz), then amplify it with an op-amp,

that was my basic idea of how to do it, however if there is better way(simple) i would love to know....

 

[MikeMl]

Spend ~$1, and buy an IR receiver, like the GP1U5x

 

[languer]

buy an IR receiver, like the GP1U5x

There's you're answer. If you want it to work, heed the advice. Otherwise, good luck.

 

[Dr_Doggy]

okok .....i ll get one,, but do you guys think you could point me to a digi-key equivalent,,, I am scared of buying one that will do something strange, like encode my data the way an IRDA would (where 1's are longer pulses,or something)

(i just need simple detector)

 

[MikeMl]

The receivers don't decode, just detect. Within some timing limits, you recover whatever 1-0 pulse train you put in to the transmitter.

 

[Dr_Doggy]

k, THNX again!

 

[languer]

A few links that may help:
**broken link removed**
Reynolds Electronics Remote Control Store
Basic IR Communications