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Surf Pi Home Build Metal Detector Testing with Gold Ring
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- Опубликовано: 24 дек 2014
- After a bit of tuning managed to get this home made pulsed induction metal detector to pick a gold ring up at between 6 and 7 inches in air. It does seem that the discriminating potentiometer on the board (second one after setting the first to 0 volts) may be better removed and used for tuning the machine to a particular metal with each use. Next part of the project is to add an audio oscillator to allow use with head phones for finer discrimination than the piezoelectric buzzer supplied with the kit. A simple 555 IC circuit should do the trick
Hello, I made the device myself, but the problem is that it does not give me the same sensitivity and the same sound
Hi. Thanks for reaching out. I have seen the same problem with a couple of circuit boards sent to me from a friend and changed chips and checked the soldering under a magnifying glass. Never got to the root cause unfortunately. I have found the board mounted potentiometers can fail so my first suggestion would be to replace to test them.
@@caledonianprospector1412 😞My device works normally, but there is not the same slight sound as exhalation at the end. And what about the file you created. And I made a file of 25 centimeters, the depth of the coin is 22 centimeters, only a very small depth
@@lablackmohammedbilal3868 I have found that can happen with different piezo buzzers. I use lower voltage rated ones if I remember correctly which can make a difference. Try measuring the output voltage on your buzzer with a voltmeter and see what you are getting then change the piezo to match it. I think I use 5v one on mine
@@caledonianprospector1412 I use buzzers but I don't know how much voltage I will try to try other buzzers
@@lablackmohammedbilal3868 not sure where you live but Ebay have a range of them. I just checked and I have used 3v or 3 to 24v piezo buzzers in the past