pistol dch

[Zicos]

hello pahom and everyone. the device does not detect a battery spark at any distance. the oscillator is used but I need to put an extra switch to understand the difference in the operation of the circuit. I will know by evening. the important thing is that I do not know at what points in the circuit I need to measure with the multimeter and the oscilloscope to know that the oscillator excites the receiver as much as necessary.

[Zicos]

the oscillator used is this one.

[Zicos]

I also put a switch on the oscillator and it seems to make a huge difference. With the oscillator off, it doesn't detect the pen at all. With the oscillator on, both the 741 and the sound generator detect the pen. If I turn off the 741, it detects the pen again (how is this done). The oscillator's power cable works like an antenna and seems to be more sensitive than the small loop. When I turn on the oscillator and sound generator, I have the longest detection distance for the LED lamp I have. And for the radio I have. Once the 741 is on, the distance decreases but the sound becomes more stable. It is also very important that the battery cases are very well secured so that it doesn't make false sounds. Also, when I grab the paper box with both hands, the distance decreases again.

[Pahom]

Originally Posted by Zicos

I also put a switch on the oscillator and it seems to make a huge difference. With the oscillator off, it doesn't detect the pen at all. With the oscillator on, both the 741 and the sound generator detect the pen. If I turn off the 741, it detects the pen again (how is this done). The oscillator's power cable works like an antenna and seems to be more sensitive than the small loop. When I turn on the oscillator and sound generator, I have the longest detection distance for the LED lamp I have. And for the radio I have. Once the 741 is on, the distance decreases but the sound becomes more stable. It is also very important that the battery cases are very well secured so that it doesn't make false sounds. Also, when I grab the paper box with both hands, the distance decreases again.

When the oscillator is turned on, the timer 555 must have the maximum sensitivity of the device. well, accordingly, the detection distance is greater. That's when you turn off the LM741 amplifier and your device works.... that's where the miracles are.

[abdou2014]

[Zicos]

I have started building the box.

[Zicos]

Does the box need to be connected to ground?

[Pahom]

Originally Posted by Zicos

Does the box need to be connected to ground?

Judging by the photos that are publicly available, the original has no shielding.