Delta Pulse

[aft_72005]

in thinking what DP panel must be....

Hi KT315
Very nice panel.
What software you utilized ?
Best regards.

delta puls new rev. by sasco

http://bgcenter.net/users/p0123.i

rev.3 sisco&kt315

http://www.geotech1.com/forums/showthread.php?t=13370&highlight=sisco&page=2

[Eugene52]

Delta Pulse

live publish rev.3-rev.4 schema and pcb

Who is unregistered ? I thought the Delta Pulse Project was completed and works perfect !! What is revision 3. or 4. ??

Revision 2. on page 25 done by kt315 was final ??


Eugene52

hi kt315

update circut this work and I can detect GOLD with this timing
TIMING:
Frequncy = 1001.5 Hz
PW(ON PULSE) = 101.25us
delay= 15us
first delay = 45us
interdelay = 198.75us
second delay = 45us
OFF PULSE = 592.5us

hi kt315

live publish rev.3-rev.4 schema and pcb

[kt315]

design

in thinking what DP panel must be....

re:sisco

Quote:
Originally Posted by sisco
why is this big difference between delta pulse and tiny about timing:

............tiny.................................. ................Delta puls

start first delay after 3us.......................start first delay after 225us-975us (pot 50K , SIGNAL pot)

first delay pulse width 23us....................first delay pulse width 40us

secand delay start after 32us.................second delay start after 1ms-8.5ms (pot 500K , SENS pot)

second delay pulse width 23us................second delay pulse width 40us

Max these is true!!!!!!!!!!!!!!!!!!!!

what is deltapulse frequncy?

(If I understand gooooood this objects I think can make digital metaldetector with metal Discernment . what you think ?)

Hi Sisco,
Geo already answered to your question.

I dubt that tiny could use 3uS as first delay... never seen anything under 7uS that works. Maybe you've made some error measuring it or used a wrong reference.

Original DP design used a frequency around 100Hz... for XR-71 , that's about the same thing... little differences, frequency is around 400Hz (if I remember well).
That's why these machines were intended for depth search of big objects at meters underground.

DP have a lower frequency cause mounted a large coil as default, XR-71 had more frequency cause was a mix-use intended machine... used also in civil engineering to find underground pipes etc.

When you design a PI for detecting small objects you need a short first delay (usually 15uS or less), then the first sample occours (often width from 15 to 45uS), then the inter-delay that is something great (>100uS, often 200 or more), then the second sample (same width as first sample so 15-45uS).

In a modified e.g. delta pulse you could increase frequency to 400+ Hz (even 1KHz or more)... then reduce the TX-on time to e.g. 50-100uS, giving you a duty factor of 5-10%... that's good without wasting too current for nothing.

Good timings could be then something like these:
f = 1KHz
TX-on pulse width 100uS
duty-factor 10%
1st delay 15uS
1sample width 45uS
interdelay 200uS
2sample width 45uS

That way you'll get small gold items with a good fast monocoil say 8'' or 10'' round.

Everything, gold rings, silver etc will sound good and of course iron !
Also some thick foil.

But then you'll get same problems that you know with iron oxides or ceramics... then is a big problem where there are these things.

Best regards,
Max

frequency

hi to all and thank you diminute.
in our country we have 50HZ power lines and my detector runs at 135Hz.
i see many noises that travel easily on my waves.i can detect a 1Ltr metal bottle at only 40 cm.can this be better out?
thank you.

[kt315]

thanks diminute! best wishes to you

[diminute]

Ok, Good

wonderful deltapulse, is very sensitive.

Congratulations !!!

[kt315]

...

[kt315]

report!

as I promised to demonstrate some result with DP so you can see that. but enough poor on value the things has of DP shows fantastic sensitivity. seems there was not limit on a deep it does. it took a bike carcass on more than 2,5 m. DP has really more sens than TF-900, all signals were been searched by both detectors.

HH

[diminute]

banned ???

Which country ???

Whats your operation frequency, in power lines and in your MD ????... may be you have the problem in this factor.

Regards,

Help Me!

Hi to all freinds.
I want ask a question.please help me.i have built delta pulse.all part of this unit works good separatly but performance of whole unit is poor.
i'v built a 11" coil for it with 35 turn(1mH).high votage(about 300 v) decay at 20 ~ 25us and i have removed T2,T3 and their resistors.with this change i have a 23us delay time. all other waves are correct too.i have seen them with scope.all pots works properly.but i have poor result in my workshop and i have seen many noise on amplified wave on pin 6 of D4.i ask you is this possible it be because of these noises?and can i have better result on real field?i ask you because in our country these devices are banned and we cant take it out every time.
many thanks.