I will check the availability of LM339 in the electronic shops.
Anyway please explain in both ways. If it is not there I have to proceed with the LM358.
@Kerim the baseline is not always a constant (Due to noise),it can clamp to a second level, so how does the comparator works in this case.
3K3 i9s when it is ON
k Is it a good way to design a Low pass filter and a subtraction circuit so that the noise effect can be avoided, is works or any other suggestions
After this stage the output can be amplified by the comparator circuit. Am I right ?
@ BradtheRad I have attached my Transmitter and Receiver circuit and please go through it and can you explain little bit more.
Do you want to suggest, that a phototransistor with ground referred emitter and a 3.3K collector resistor will be more sensitive? Please think about the nature of a two-terminal device and reconsider.In the schematic you posted, base current (photons striking the base) goes down the emitter of the phototransistor, and then must go through a resistor to ground. This reduces sensitivity.
Look sharp for the power supply configuration in the respective text book examples. I clearly stated, it doesn't work for single supply, which is your configuration, unfortunately.it is a basic inverting amplifier design that I have seen in text books
I didn't suggest 38 kHz, it has been introduced up by KerimF, because it's a standard in IR remote control. I think however, that a few kHz will be more easy to process.What is the importance of thee value 38 kHz.
What is the importance of thee value 38kHz. Normally it should work in the region of 1-40KHz.
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