Delta Pulse - Take 2

[kt315]

hello Sally
million times i gave same answer (((

DP works with _long_FIRST DELAY. so from that following the issue -
small coil gives NOT the same result like PI schematic with short FIRST DELAY - we know them like Hammerhead, MPP, Bara, Surf
that working with 5...12us FIRST DELAY.

so... you must build different detector now... because DP is deeper, main frame which is a ramka coil 1x1 m (METER).

look typical standart metalhunting session to have a representation what is DELTA PULSE as the deeper.
https://www.youtube.com/watch?v=ATLehDsygGs

дима спиридонов
5 years ago
на прошлой неделе таким глубинником подняли 17 бойцов 326 стр.гв. дв в Калужской обл.Зацепили за каски.
Dima Spiridonov

Last week, 17 fighters of the 326th division were raised up from by such deeper.
in the Kaluga region. Hooked on helmets.

pleasure

[Sally]

Thanks for the reply Kit315. I am fully aware that this DP is for big coils but I just read from other sub forum here of delta Pulse
and many enthusiast are building this machine. They are using small coil before upgrading to big search head. Just want only to
compare with the output of detection of my DP using small coil but it doesn't mean that it is my purpose.

I just check the time delay of T4 and the result is 8-32 micro seconds and T5 is 40-310 micro seconds. I am confused with the result
because the chart time delay that was posted here as a guide is T4=90-170 micro seconds and T5=160-900 micro seconds. Please let me know your thoughts.

Sally

[kt315]

is T3 width changing from 100-120 to 450-500us turning pot DEPTH? in edges positions of the pot

[surfdetector]

Sally,

Can you post a picture of your oscilloscope shot of T1?

[Sally]

Yes its changing by turning 20k depth. from 100-330 micro second. by changing C3 15nf-22nf it becomes 150-650 microseconds.

[Sally]

For Surfdetector, here is the screenshot.

[surfdetector]

For Surfdetector, here is the screenshot.[ATTACH]57152[/ATTACH]

This is the output of the preamp? It does not look correct.

[Sally]

Yes, output of LF357. No search coil connected.

[Sally]

screen shot of DP T1 with search head connected.

[kt315]

again same question. what electric net standart frequency is in your country?

[Sally]

again same question. what electric net standart frequency is in your country?

220v AC, 60hz frequency.

[kt315]

220v AC, 60hz frequency.

thx. looking as 'american standart' (postwar help of Big Brother). set sure 120Hz in point
T2 or T3.

[surfdetector]

screen shot of DP T1 with search head connected. [ATTACH]57153[/ATTACH]

I cannot really see the wave form properly here. How did you choose the size of your damping resistor?

[Sally]

I cannot really see the wave form properly here. How did you choose the size of your damping resistor?

I used 680 ohms 1 watt resistor.

[Sally]

thx. looking as 'american standart' (postwar help of Big Brother). set sure 120Hz in point
T2 or T3.

Yes I did adjusted 100k trimmer with T2. Time is 8.3 millisecond = 120hz.