'KROT2-XM' (mole), new project Xmega32

[Wiltran]

Krot2 website Information

I've noticed on the AndrewK2 website under the schematic in small letters the following:

R9= 2.2K-3.3k
R10=820 Ohm
Ku reception channel amplifier 50-80 selected R10
Earth cannot untie -Remove the choke Dr1- (does this mean if you cannot get the manual ground balance to accept changes?)
Can someone please translate this Google translation?
Under what circumstance would you make these changes to the original schematic?

[reiv]

Change value of R9 from 2.2k to 3.3k, R10=820 Ohm -it gives more gain. Check your Ku -this is coefficient of gain and shuld be in range of 50-80 if it`s not change value R10 .To check it press and hold "0" when Kpot is starting (on new soft). If You can not properly ground balance from automatic set, remove choke Dr1

[Wiltran]

Thanks Reiv, my Ku shows 91, my R10 is 1K, should I change to 820 Ohms?

[reiv]

No You don`t have to is more enough, with more gain he could be unstable.

[Wiltran]

OK then, should I change R10 to 1.2k or ? so Ku ranges between 50-80?

[moscadondres]

Happy new year to all and to Andrew,best wishes.

[kt315]

new video with HNY from Andrew

[sled]

Hi,

may I ask what the purpose is of R1 and R2 in the schematic (red circles) ?

If I want to use a different TX frequency, do I need to adjust the RC input filter R6, C8 ?

[ANDREW K2]

Happy New Year!
Red circles do not matter. The frequency for each coil is given by C1.

[moscadondres]

The last schematic of "KPOT2" shows C1=220nf,can you explain reasons,thank you for reply.

[kt315]

[kt315]

C1 value is related WHAT type coil you use. you have to learn what is CURRENT RESONANCE and what is VOLTAGE RESONANCE.
then you ll get answer.

if you use VOLTAGE resonance coil you put C1 with MAX value you can.
if you use CURRENT resonance coil then you have to SURE TUNE C1 value. that is why C1 is written with (*)
ie it means in russian schematics 'tune its value' in concrete this case 'tune it on the resonance'.

[Wiltran]

Latest Mole2 schematic

Now I am confused! Ive noticed on the latest schematic a change of C1 to 220 nf, C0 changed to 10nf, and C18 in D2 amplifier changed to 22 pf? or nf? Are these changes related to the latest turbo3 firmware for use at 10 khz?

[ANDREW K2]

Yes, it is setting the receive path frequency response at 10 kHz

[kt315]

Hello, I see that you are very good with electronics and wanted to help.
I built the metal detector Kpot_M I publish here the "Tepco" user and you also think that I build.

http://www.geotech1.com/forums/showt...roject-Xmega32
Post number 5
I need to know where to connect the cables on the LCD screen and buttons.

https://dl.dropboxusercontent.com/u/...M_Conexion.png

Attached is a picture appreciate if you tweak the location of connections with photoshop.
I would appreciate if you can help me. Thanks and sorry for my English.

Dear Pedro,

Andrew is some kinda idiotic man. I had welcomed his 5 times in forum MD4ALL, he does not wish to come. that is because I am not able to answer you -
if he does not write IN RUSSIAN I am not able speedy to share the info.

best regards