Malysh FM

[bernte_one]

source code is not available only hex file
i asked Eddy71 some time ago but he will not give the source code- and i respect it
the source code is his intellectual property

and that he give us all files for rebuild is more as enough


the next Thing
ths circuit is very simple but has also a very good Performance as it is, so no Need to adapt it with something like arduino

[Davor]

Sure, but you may get a Nano board and program it with an USB, and supply only a simple oscillator, and all you spend is ~10 Euro.

[kt315]

ok. this is text translated by Yandex, pre-history written on Eddy site. so you may grasp that Malysh is his first step in u-chip tech, hi is a beginner,
only beginner. like you.

Five years ago, I bought the compiler of C language for microcontrollers. Prior to that, 15 years wrote the program in pure assembler. It took a lot of time and effort. And work with the math introduced me to extreme depression. But the compiler had something to learn. And as the Guinea pig was the easiest metal detector with the ability to recognize types of metals "Malysh FM". "The scheme without scheme". Most of the necessary I was able to implement software using mathematical processing of measurement results. The principle of operation is very simple: if you make in the field coil circuit of ferrous metals, the oscillation frequency of the circuit decreases. When making non-ferrous metals increases. What the controller indicates. It is easier to think was impossible. Diagram of the detector was minimized as far as it could.But mene distribution diagram of the metal detector, people from different forums were overcome by the requests to modify the LC-generator, it is possible to play with the power scheme, with quartz.. the result was "Malysh FM" - "turned inside out" "Malysh FM", more fit for the experiments with signs of normal circuit of the detector.Oddly enough, five years later, people continue to experiment with the "Kids". And regularly get e-mails with questions and requests. So the other day a friend of mine began to struggle with the stability of the generator - not want to work for the life of me.. Came requests as "stick crutches" in the program to win a pair of transistors on the outside.When I opened the source code of the firmware and saw constructions like if() goto: I felt ashamed. Understand that until you have done code refactoring, my conscience won't let go. And indeed you did. Along the way had thoughts on how to improve his scheme.Since the parameters of the external MOSFETs LC oscillator of the metal detector depends on the voltage of the pulses, not to play with the resistors and a soldering iron I did the automatic setting of the threshold of the embedded comparator. The controller itself performs this setting.The controller inside ADC PIC12F675 led to the idea to make a battery indicator. To the scheme was added only three resistors. At startup, the controller measures the battery voltage, and if it is below 5.5, then fast flashing LEDs and an audible signal informs the controller about the need to replace the battery of the detector on new.Thanks to new algorithms-locked loop frequency and initial calibration, was able to significantly relieve the start of the detector in harsh electromagnetic environment. Has expanded the range of permissible input frequency of the search oscillator (15 to 25 kHz). Diagram of the detector has not changed.Assembled Board smaller than a matchbox and contains scarce or expensive parts. The capacitors of the circuit we must get the film. With ceramics You will not get a stable frequency and you will spend a lot of nerves. With the right capacitors metal detector "Malysh FM" is a clock on the table without care frequency, only Corluka every 2 minutes to remind you to turn off the power.To facilitate the calculations of coils and capacitors of the circuit of the search coil of the metal detector, I strongly advise the Coil32 program. It is completely free and perfectly performs its functions. After fabrication of the coil, it needs to be escaped. You can wrap in aluminum foil and then connect the shield to the minus charge. The screen must have a discontinuity in the output pane of the wires out or You will get closed loop to work and the generator will not be.To facilitate the configuration of the coil in this simple metal detector I entered diagnostic codes. If at the start You can't hear the sound "whew!", then the generator something. Single "rush!" after the error signal indicates a too low frequency, double is too high. Three "peak"-and mean unstable frequency of the generator. This may be due to bad capacitors of the circuit, dirt on the motherboard, a dead battery or a strong interference around. Need to feed the charge from the battery "Krona". When powered from the PSU, almost certainly, You will be disturbed by noise. If the generator is assembled with errors and doesn't work, You will hear four "peak".I had several people in the mail was blamed for the unstable launch of the "Kids". My explanation of possible causes of unstable frequency of the generator were not accepted as an excuse. I've been called a sadist, who causes people to suffer with running the wrong scheme. So I tried to consider this constructive criticism and in the new firmware significant attention was paid to it stability. Sensitivity is the antithesis of stability. Therefore, the higher the stability, the lower the sensitivity. And Vice versa. Try.

[Davor]

Beginner or not - I'm lazy. Sheer laziness made human race so fabulous. If we were not so lazy, we'd be happy with daily life tedium. This way we may enjoy our lazy lives instead.

[nick holas]

mistake??

hi all
i ve made this small metal detector and i made it in pinpointer(small coil around ferrite) and it works great!!!!! with discri!!!!
but i think the pcb wasn t enought thick so i made one other pcb 20mmx200mm to fit in 25mm pipe and..... it don t works!!!!!!
may i submit you my new layout to see where there s a mistake????
thanks a lot

[kt315]

sorry Nick i am not able to translate a video by subtitles... so take it over as-is... try find somebody in your neighbour with russian...

[kt315]

part 6

[nick holas]

hi thanks for your fast reply KT315
i think i ll redraw another pcb with the new scheme perhaps it ll work better as pinpointer
will post picture if it work (i ll try to put it in a small pvc pipe diametre 20mm-25mm with 23A 12v battery)
thanks again

[kt315]

i give again direct links on Malysh-FM2
http://www.md4u.ru/viewtopic.php?f=8&t=3977
and
http://www.md4u.ru/viewtopic.php?f=19&t=10135

[nick holas]

thanks again kt315
i have pointed some mistakes on my pcb and overall it don t works so i m going to do another pcb with my modification just to see
thanks for the usefull link

[ripsdevala]

Anyone get low sound issue? All is working

[Rom_1]

anyone made it in full smd ?

[kt315]

anyone made it in full smd ?

http://www.md4u.ru/download/file.php...9060f50890889d

[bernte_one]

this file contains nothing

but take this

[ripsdevala]

Is malysh fm2 always give signal when close to soil/ground? Already wrap it with foil nothing change