Questions about MD

[ijebbar]

Hi everybody
I am new on the forum and also in the field of metal detection.
I have some questions if someone on the forum can answer me please:
- What are the elements that determine the performance of MD?
- Is it possible to reach 10 to 15 meters deep?
- What is the best MD to build?
Thanks to all

[liudengyuan]

A good machine must have a very sensitive and low-noise preamplifier circuit. After reading a lot of forums, they all use the positive pole of the power supply as the input of the op amp. The tube forms a lot of noise, which is not conducive to amplifying the weak signal of the op amp. Another important issue is that the stability of a machine is very important. If it is unstable, no good preamp will have good results , So I expect someone to solve these two problems

[kt315]

you have to go on silver dog site and choice a board of a project to buy. begin from any.
sorry, just 2 meter on golden plate 15x15 cm. for 10-15 meters you must learn dowsing rods how use. remember you must refuse to smoke weeds
and refuse from alcohol. reading some mantras.

[Carl-NC]

- What are the elements that determine the performance of MD?

TX: Current, size of coil, number of turns.
RX: Size of coil, number of turns, SNR of the circuitry.
Very simplified, there are many other elements.

- Is it possible to reach 10 to 15 meters deep?

No. 1 meter on a Coke can, 2-3m on an automobile.

- What is the best MD to build?

Depends on the application.