Delta Pulse

[mk22000]

Hi kt and thanks for your reply.so you think my problem is the shield?i describe the problem and thought that a component may not s faulty..i check the resistors which are ok and ask if i have to test something else cause my machine working but stop when i connect the coil..

[kt315]

hi
i see general ununderstanding of you about shielding necessity. you must sure know and have a representation -
YOU, YOUR BODY IS SWIMMING IN ELECTROSTATIC FIELD. this field is HUGE.
ESFI is big problem for stabile metal detector work but there are standart decisions against ESFI.
for first time you have to look the pics, ALL PICS, learn all methodics that uses companies. learn why graphite inside the housing,
where inflicts, where connected.

https://www.geotech1.com/forums/album.php?albumid=102

[mk22000]

Hi guys i just finished my delta pulse but i have a problem.when i open it is ok i hear sound from speaker i change the sens and other pontesioneters and tune it until is quiet.my problem is that when i put on the coil it doesnt work and no more sounds from speaker.even if i have sound and didnt tune it and try to connect the coil it stops the sound and when I disconnect it and only then the sound come back.what do you think can be fault?any idea?thanks guys...

[TufaN]

[TufaN]

Congratulations on your KT315. The dp layout works really well. very stable and very good underground depth. 1st video coke coke box 90x90 cm bobbin test 180 cm. 2nd video 1 euro 13 cm coil 40 cm

[aft_72005]

just some pics. no proteus. no free code. no gerber. zero point.

Ok . thus again delta pulse is number 1.
Some design must be test but delta pulse is also perfect

[kt315]

just some pics. no proteus. no free code. no gerber. zero point.

[aft_72005]

see rocky pulse

Hi KT315
Where is roky pulse file?
Are you have proteus file ?

[aft_72005]

Hi KT315
Where is roky pulse file?
Are you have proteus file ?

[kt315]

meet your new greek partner!

New message from: johnsmith-gr

Next week I will be free and I will write you from geotech1 and we will discuss thank you

Your previous message

seems you do not read what i write. REGISTER IN GEOTECH1 AND I WILL TELL
YOU MORE. ebay bans messages with links.
your nativelanders will tell you instead me, greeks.

johnsmith-gr:

I understand do you test this devices performance how deep can go??

Your previous message

sorry, i am not in course of the site. i'm in GEOTECH1 metal detector forum and you may ask/see me there everytime.

pleasure

johnsmith-gr:

Ok it?s not so fast but I will wait can I ask you a question are you selling this board to another site called kapakped???

Your previous message

i think very speedy. 2-3 weeks.
thank you

johnsmith-gr:

Dear seller

I paid for the board that you are selling and I was wondering in how many days I will receive it??

[jeep6789]

thank you

[Vadim18]

I have done a test, ne555 needs to increase by 10mv, the audio output has a slight change, but I want to increase its voltage by 1mv, the output frequency will change, which is conducive to improving sensitivity

If you want to experiment, you can add amplifier with 10 x gain + filter and finaly drive VCO.
This idea not mine it was already posted here on forum. Here is my re-drawing.

[jeep6789]

I have done a test, ne555 needs to increase by 10mv, the audio output has a slight change, but I want to increase its voltage by 1mv, the output frequency will change, which is conducive to improving sensitivity

[Vadim18]

Can anyone provide a very sensitive voltage-frequency conversion circuit? Higher accuracy than 555

You can increase VCO sensitivity just only by lowering R37 resistance to 100-200 Ohm. As variant place aditional 200-470 Ohm resistor in paralell with R37 - this will increase current wich produced by current source on T9 transistor (look circuit)
I already do this in my DP unit.

[kt315]

Can anyone provide a very sensitive voltage-frequency conversion circuit? Higher accuracy than 555

VCO on 555 working good https://www.youtube.com/watch?v=1mo_khvsSvg
do not see a reason to rego on PIC based VCO.