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Originally posted by J_Player
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Hi Esteban,
Your words are true. Your approach to building circuits for LRLs is not the same as most electronic engineers and experimenters would use. The people who use conventional methods will not have success with building your circuits because they are trying to design according to conventional designs, without considering the importance of the essential small signals that you look to capture. When Clondike Clad says "Not one worked", he is talking about other variations of LRL that he built from other people, not your designs. He does not have experience with using a radio receiver to monitor the audio frequency signal of an oscillator, (this method is not taught to experimenters, or in schools that teach electronics). I expect that people who cannot follow your instructions and build the circuitry as you described will not find success. The best they can do is to say the theories they were taught do not explain how your methods can work.
One problem with your previous posts is that you have not given a good description of the IR LED detector. I read your posts for IR metal detectors, and I see some confusing information. One example of confusing information is for the receiver. Here is what you previously explained about the receiver for the IR LED detector: "I think occurs a variation in height between the tone present in a receiver (this is filtrate as an interference in ANY sensitive system like a milivoltmeter). YOU DON'T NEED IR leds receiver. Also this filtrates in FM reveiver, and the signal of the target is directly in the beam or beams, no in the telescopic antenna, for example. But today maybe is not possible in this band (FM)".
The words you posted give some information, but also makes a puzzle. What you posted tells us that the signal of the target is in the IR beam, not in a telescopic antenna, and can be heard on an FM receiver. But most portable FM radios use a telescopic antenna to receive their signals. This makes another puzzle of what to use for tuning the signal. When you say "today maybe is not possible in this band (FM)", This makes people think the FM will not work because you say maybe it is not possible, and the signal does not travel in the telescopic antenna. So they think maybe they must use AM for listening to the variation in the height of the tone that you say can be heard.
Also, you say there is a variation in the height between the tone present in the receiver. In English, this means the amplitude of the square wave is changing. But you later say that the phase is shifted. This is where you make the puzzle. Nobody knows what kind of change to look for... Amplitude or phase shift? Or maybe something else changed that Esteban did not tell us... maybe frequency? This makes some people think that a BFO detector will find the change, others think AM radio will detect the change of amplitude. Nobody knows what you have explained. This is not because they did not read your words. It is because your words are confusing. Many people would understand the IR LED detector if they had some clear explanation, but what you posted will lead most people to arrive at the wrong idea for how your IR LED detector works.
Best wishes,
J_P
Your words are true. Your approach to building circuits for LRLs is not the same as most electronic engineers and experimenters would use. The people who use conventional methods will not have success with building your circuits because they are trying to design according to conventional designs, without considering the importance of the essential small signals that you look to capture. When Clondike Clad says "Not one worked", he is talking about other variations of LRL that he built from other people, not your designs. He does not have experience with using a radio receiver to monitor the audio frequency signal of an oscillator, (this method is not taught to experimenters, or in schools that teach electronics). I expect that people who cannot follow your instructions and build the circuitry as you described will not find success. The best they can do is to say the theories they were taught do not explain how your methods can work.
One problem with your previous posts is that you have not given a good description of the IR LED detector. I read your posts for IR metal detectors, and I see some confusing information. One example of confusing information is for the receiver. Here is what you previously explained about the receiver for the IR LED detector: "I think occurs a variation in height between the tone present in a receiver (this is filtrate as an interference in ANY sensitive system like a milivoltmeter). YOU DON'T NEED IR leds receiver. Also this filtrates in FM reveiver, and the signal of the target is directly in the beam or beams, no in the telescopic antenna, for example. But today maybe is not possible in this band (FM)".
The words you posted give some information, but also makes a puzzle. What you posted tells us that the signal of the target is in the IR beam, not in a telescopic antenna, and can be heard on an FM receiver. But most portable FM radios use a telescopic antenna to receive their signals. This makes another puzzle of what to use for tuning the signal. When you say "today maybe is not possible in this band (FM)", This makes people think the FM will not work because you say maybe it is not possible, and the signal does not travel in the telescopic antenna. So they think maybe they must use AM for listening to the variation in the height of the tone that you say can be heard.
Also, you say there is a variation in the height between the tone present in the receiver. In English, this means the amplitude of the square wave is changing. But you later say that the phase is shifted. This is where you make the puzzle. Nobody knows what kind of change to look for... Amplitude or phase shift? Or maybe something else changed that Esteban did not tell us... maybe frequency? This makes some people think that a BFO detector will find the change, others think AM radio will detect the change of amplitude. Nobody knows what you have explained. This is not because they did not read your words. It is because your words are confusing. Many people would understand the IR LED detector if they had some clear explanation, but what you posted will lead most people to arrive at the wrong idea for how your IR LED detector works.
Best wishes,
J_P
Why radio? Because you have here amplifier stage and RF that facilitate experimentation.
I use the FM antenna. I connect a telescopic antenna via coax cable to 30 pF input FM antenna. The shield is used.
But I see that the detection come directly in the beam, because the target is in the direction of the beam, not in the antenna, but maybe antenna play a rol.
Some changes exists in the audio when target is detected. With it I detect various times objects at size of copper wire 2 mm diam, 0.5 cm long! but near. A bullet of 5.5 mm compressed air riffle at 1.5 m!
Can temperature associated to these items the factor wich alterates the pattern?
In AM radio, any spark, any movement, bla, bla, produce spurious beeps, so is not a candidate.
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