Malysh FM

[Eddy71]

I used a ready made coil. He was on a ferrite core and we recovered from a old TV. It has a value of 3mH.
[ATTACH]41706[/ATTACH]

The coil on the ferrite rod is very sensitive to the magnetic field of the earth

[kt315]

use AMS1117-3.3 instead LM317 (delete R1 and R2).
in package SOT-223

[gaby_sult]

I used a ready made coil. He was on a ferrite core and we recovered from a old TV. It has a value of 3mH.

[ionut_mtb]

Thanks for reply, i know your video already, i just wanted to make FM V2, not FM2 V2, because of limited space inside housing i choose. Maybe i need to make FM2 V2.
Is it ferite core n the coil? I've heard that with ferite will act like a compass.

[gaby_sult]

That's what I did.
Try and respect the values and will definitely work.
Malysh fm v2.rar

here and the proof:

https://www.youtube.com/watch?v=GSC9Puvndog

Ceau...

[ionut_mtb]

I finished malysh fm v2 like in schematic. i did not mount the led's and cap/diode from red circle. pic is 12F629. (i don't find hex for 12f675 fm V2 ) When i connect power it beeps once, when target is approached to the coil i can hear only one click and then nothing, no more click. After less than one minute it's making another beep, like autocalibration. Calibration buton works also. I think the PIC programmer is ok.
I tried also 16Mhz/20Mhz quartz. Two types of coils (both 1400uh-1500uh) diam 5cm 0.3mm wire and 0.15mm (not shielded).
At pin 5 i have this oscilation, my calculation is 19khz.

[Altair]

you dont Need to set any fuses it is not an atmel chip
it is a microchip pic Controller use the pickit3 to load the hex file on chip
in the Setting activate target power 5v direct from programmer

Bernte_one, thank for your reply!
Yes, already seen; I do not have the pickit3 but just an old parallel programmer (Picall).
Chips programmed in this way do not seem OK: No sound at startup and LEDs always flickering. I have to investigate, perhaps some incompatibility of Malysh's hexadecimal files format with the programmer.

[bernte_one]

you dont Need to set any fuses it is not an atmel chip
it is a microchip pic Controller use the pickit3 to load the hex file on chip
in the Setting activate target power 5v direct from programmer

[Altair]

... I think a correct value could be: 3F93h, but I haven't try yet!

[Altair]

Is there somebody who help me with micro fuses setting on this project?

[Virdi_248]

Hello.

I have a problem with detector fm2. Not if pic12F675 this one evil programmed or that the bobbin is bad. I leave two videoes, one with bobbin of connected test and other one without connecting the bobbin. Can someone help me with my problem? Endless curl.



Coil connected

https://www.youtube.com/watch?v=LC19gsc0fKk

Coil not connected

https://www.youtube.com/watch?v=Ce-f-75lgG8

[Sacchetti]

Thanks for the info on fake chips.

Sorry if I don't write well in english but I am sure the concepts are clears...

[6666]

Thanks for the info on fake chips.

[Sacchetti]

Please, let me to inform you that I have bought in the past some PIC12F628/629 in eBay (from different CHINESE sellers) and all them are only CLONED chips.
They are clone of original but some instructions works differently from the original Microchip!
However I have found also other differences compared to the datasheet.

You can found many thread in internet that speak about this problem (counterfeit or fake).
Instead, if you buy these chip from RS, for example, then you receive the original working at 100%.
They costs more but it is normal.
You can understand immediately if the chips are "cloned", "remarked" or "original but not perfect" from the price.
If the price for a single part is less of the price done from RS for a large quantity (1000+), it is better that you avoid the transaction! In other words it is better to don't buy.

Instead "Original but not perfect" are some productions that has failed the quality test therefore often are selled for less to toy makers.
They run for example run at lower frequency or only at one voltage (not full range). But in this case the engineer know which is the problem and use a workaround.

Therefore if you have a fake chip then you can become crazy to understand where is the problem!
You can solve in a simple way, buying from RS, Farnell, Digikey, Mouser, Distrelec, Jameco, etc. (these are only examples, I don't work for them).

Look there for example:

http://www.microchip.com/forums/m533378.aspx?high=counterfeit

and there:

https://www.sparkfun.com/news/364

[blobber]

I use mkt capacitor in tank circuit, also I tried different values for C2 from 15-33nF. Also my units was not running good with 20 Mhz quartz crystal. While experimenting, I changed to 16 Mhz, with better results for stability and startup.
Also Gaby's recomendation to add one diode, was helpful.