Delta Pulse

[kt315]

this is in case if you have something still non-experimented and modern. while DP is ended itself product, it had be done may be in thousands copies, so it is not needed in improvement. you are only waste your time on research of bicycle and wood horse toy. if you would be build QED I will say you hey you are right because nobody bult the QED in the world do improvements and do research, share your expirience to everybody are waiting PI machine with discrimination and puper hight speedy DSP ucon.
greedlab will be cried to hear you...

[Tepco]

About only meaningful improvement of DP can be getting rid of LF357, adding charge pump\regulator and using some normal 5534 style amplifier instead, everything else is, more or less, waste of time.

[kt315]

and what? will you add a depth or stability? DP design is THE peak of stability and the peak of depth. it does not need in improvement.
we HAD discussed thousands times about changing of LF357. and PLEASE do not reminder me again about 5534.
I give you in 1001 time a list of opamps - AD744 AD845 LT1122 OP42

PLEASE DO NOT BE BACK YET TO THIS MATTER!

[kt315]

check

[Nicolas]

check

[ATTACH]27331[/ATTACH]

Good designer and sculptor Kt315

[Jose]

Perform many tests with the DP , and I think there is not much to improve exept small changes , according to the use that will be given to the detector.
To improve , you can experiment with the damping resistance and frequency , in addition to the coil, if you want to use with medium or small coils.
If fast coil is used, it can reduce the delay time to 17 or 18 ns , no less, which does not allow the design of the preamplifier stage .
Not experienced with other various integrated to LF357 , but with the LF356, did not work so well.
I prefer to use the pump load, which apparently improves stability.
I do not use the fast diode between the coil and the IRF740 because the design of the DP , the response does not improve within 17 or 18 ns , on the contrary, this diode decreases some power to the coil .
This is not new , but again for the less experienced .
To detect large objects with the DP , use low frequencies of 100 Hz and alrrededor long time TX , 300-500 us .
To detect small objects are often up to 400 or 500 Hz and TX alrrededor times 100 to 200 us .
Regards, Jose

[kt315]

and I think there is not much to improve exept small changes

Mohandes has taken DP improved. 350 Hz pps and 17 usec MAIN DELAY are the improvement, but only some adaptation for small coils and coins' hunting.
Mohandes still does not know about what he makes.

[kt315]

I prefer to use the pump load, which apparently improves stability.

do not know what you mean under "pump load". can you give a schematic?

I do not use the fast diode between the coil and the IRF740 because the design of the DP , the response does not improve within 17 or 18 ns , on the contrary, this diode decreases some power to the coil .

you need in the diode if do deeper machine. if use BIG pulse WIDTH. anotherway do not use it! do not use it in - baracuda, hammerhead, surf, etc.
do not use it for money hunting in ordinary non-deepers detector with 50-100usec PULSE WIDTH!

[Jose]

KT315, I'm trying to say is that Delta Pulse is well designed.
As much as I try to improve, it is difficult to make more profits.
With some minor changes, it can be adapted, for example for coins as you mentioned. But hardly can work at 10 or 15 us.
Call charge pump to the resistance of 1 ohm and 4700 mF capacitor, added in the "Source" IRF740, in some schemes.
Jose

[mohandes]

hi nicolas
can i use #2324 for this new DP design ,
again thank you kt315.
when i finish the second i put my result.
EDIT:
oh , yes i can use it
just tell me about the RX values .
regard

[kt315]

can anybody write a due bottom size diameter of the knob?
http://www.ebay.com/itm/5-x-Grey-Kno...d#ht_762wt_894
i mean you would measured the precise size, in 0,1mm of accuracy, do not write that it is 15mm.

[Nicolas]

hi nicolas
can i use #2324 for this new DP design ,
again thank you kt315.
when i finish the second i put my result.
EDIT:
oh , yes i can use it
just tell me about the RX values .
regard

Yes you can use it

The value RX depend to type of LCD. Use pot 10k to calculate the exact Value

Look for Pulse 2 DP 2 in forum. I dont know where it

[kt315]

it can be adapted, for example for coins as you mentioned.

what VLF for coins you would be voiced for?:

- Bounty Hunter IV. small board, good for underwater use. SMD. two tones, smooth discrimination.
- Cobra II. middle size through-hole board.
- Teknetics S/T, not data on board.
- MD3080, chinese waterproof, a clone of Fisher 1266x. there are boards in SMD and through-hole.

[mohandes]

i want use lf356 in this metal detector
and STTH1210D???? have a datasheet any body???

[Toros]

i want use lf356 in this metal detector
and STTH1210D???? have a datasheet any body???

Mohandes, when will you learn to use the search engine on the Internet?
http://pdf1.alldatasheet.com/datashe...STTH1210D.html
http://web.mit.edu/6.301/www/LF155.pdf