Elektor M.D. kit

[Guzzi]

http://www.elektor.nl/metal-detector-kit?mc_cid=7e03affc13&mc_eid=c97d16a932

[Davor]

You can find a schematic of this detector here: http://www.produktinfo.conrad.com/da...ELBERBAUEN.pdf
However, it is based on a HT46F47E microcontroller so making it without a pre-programmed micro is highly impractical.
The working principle however is very sound.

[Guzzi]

Hello Davor

The price of this kit is only € 29.95 ( $38,- ) and easier for many people to construct.

regards

Leendert

[Qiaozhi]

This is essentially just a Beat Frequency Oscillator (BFO) design. It's measuring a frequency change when metal gets close to the coil.

[bernte_one]

i have build this Thing
found it very cheap on Thalia book store i remind it was 25€
this Thing is for the garbage, bad sense, learning effect nearly Zero

for this Price you can buy a fully woking new or used md from ebay which you can tune or mod or build another coil for