Quote:
Originally Posted by Geo
Hi Esteban  .
The problem is that at my City i can't find the LM3915.
If it is better from passive receiver i will give it a try.
At who distance did you found the silver knives, spoons, etc?????
Also at one photo from you i saw inside a FM radio again????
What about it??? Did you found the silver knives with the radio inside or no??
Regards |
Maybe you can replace by LM3914, but this is lineal in voltage, not logaritmic.
A friend found by similar machines based on this circuit. He found at 30 m, buried 1.30 meters. I put the radio inside, but is not necessary. Yes, the detection was with radio inside, but also without radio I found several times objects with it. I like it because this is some reluctance to detect riffle cartridges, for example, but round buttons silver, bronze, etc., coins and other things are detectable.