Malysh FM

[Toros]

1 or 3K ?

Other 3K resistor is connected to the battery positive, I can't see it on schematic.

3.4 volt supply voltage is the scheme Malish2 ver 2. See this diagram:

R1 has a value 3k in scheme Malish FM2 (it is not ver.2). Here, the power of the pattern is 3.3 volts. Software for the processor in these two versions is different
Hence the question - for what you've done circuit board and it fulfills software processor of this scheme?

[chevesne]

1 or 3K ?

Other 3K resistor is connected to the battery positive, I can't see it on schematic.

[Toros]

Look at the scheme. Adj pin of LM 317 is connected to ground through 1k resistor. In this connection it is gone.

[nick holas]

where is my error???

hi all
i ve made this pcb from malysh v2 sheme to fit in a 20mm diameter little water pipe. pcb is 130 mm X18mm
i ve checked and rechecked my pcb and with lm317 unable to have 3.4 v in 1 and 8 pin of the pic!!!!!!
with 9v battery to test and i have aprox 6v (i m affraid connecting pic ,it s little more for this pic)
(s1/1,s1/2,s1/3 are key switch pin out)
maybe someone help me???
thanks

[ripsdevala]

[gaby_sult]

[ripsdevala]

How to reduce the sensitivity? This is the only way to make it stable on the soil and concetrate.

[ripsdevala]

Nice new pp Kt sir,
I use this pcb mod, change some value and use LM317T
Please check

Already calibrate when lying on the ground, nothing change, on the air is stable even if i shake it

[kt315]

also you do not use switch CALIBRATE (RESET) laying a coil on ground. just cause you do not see it on the schematic.

[kt315]

Malysh 's principle is a measuring of freq deviation and certainly you get that if you put down the coil on ground.

[kt315]

ok. i see you do not touch pcb never. turn it on right on ground a coil laying on and give a video.

[ripsdevala]

I think the mistake is that looking on the street outside your house. Such places are usually highly contaminated metal waste accumulated there over the years - nails, beer caps and others.
Go somewhere outside the village there and try to see what will be the behavior of the detector

Let me try later on padi field... I think the result will be same, my front yard is lots of nail but not in every cm, every 20cm maybe, same result on tile floor.

[Toros]

I think the mistake is that looking on the street outside your house. Such places are usually highly contaminated metal waste accumulated there over the years - nails, beer caps and others.
Go somewhere outside the village there and try to see what will be the behavior of the detector

[ripsdevala]

i can show that with magnet on any sand - thats normal. you do something wrong. shield
a space inside box, around the pcb. connect the shield to the ground. both points of shileding must be in one point -
from coil and from housing to the batts clemma.

Im not yet put it on the box, take a look

https://youtu.be/-Lv9RPfULl4

Let me know if i do something wrong, i hope it can be use on the ground.

[kt315]

upload a photo with - your hand with PP, the soil in touching with. i will draw a way to flow of electrostatic field voltage/current.