Delta Pulse

[kt315]

Noemio, you can certainly set ANY frequency. but then you will get MORE noise and unstability on freq=/=2*50*N.

read pls a mention http://www.metaldetection.net/english/DeepersMF-En.htm

the DEEPERS MF Model 2008 can be adjusted to 400 different frequencies ranging from 550 Hertz to 950 Hertz. This allows you to fine tune the instrument to your particular hunting needs. Eliminate mineralized ground and electrical interference and maximize your chances of success. It's the more powerful detector of our production.

or do you wish minimize your chances of success?

[Max]

Thank you so much KT315, but now I'm much more confused :

"...the working frequency must be ABSOLUTELY PRECISELY 100 PPS. or what you have industrial frecuency multiplied by TWO..."

and

"...Multiples of the power frequencies also had to be avoided e.g. 100 or 120..."


I apologize because my English is not so good, but the phrases seem to be discordant!
The second sentence should mean that neither 50 Hz nor 100 or 150 or 200 ecc.. are suitable frequencies.
Am I wrong in something?

TNX again

Hi,
indeed is really easy thing.

Eric Foster explained why you have to avoid exactly put the MD in the multiple of mains frequency, whatever it is in your place... 50 or 60Hz.

Now, you have to know that many people made actually good PIs using very standard frequencies like 100Hz or 400Hz but there's a drawback: these MDs tuned at that p.p.s. rate are often influenced bad way by power lines.

Myself built many of these... tuned to that frequencies too and got actually noise from power lines during e.g. testing on the bench, but just sometimes, not always. Depends on the amount of noise you have around... the more the noise from e.g. power electrical motors etc and you'll be more and more annoyed by that erratic signals...

I have to say that often that same detectors tuned at e.g. 100 or 400Hz are very performative outdoor in open space, farm land etc... far from electrical noise.

You must also know that people like Eric Foster give the ability of changing e.g. 10% more or less the frequency of their PIs: an example is deepstar that runs at 3Khz with a tolerance of many hundreds Hz you can set by a control knob... just for the purpose of minimizing external noise interferences.

In Delta you're expected to use it at 100Hz... you can , and it works good outdoor most of the times. But you'll better set something 120Hz if you have 50Hz mains frequency... or 150Hz if have 60Hz mains frequency... that way you'll get it works better in about all situations.
Another interesting frequency is 400Hz (XR-71 is that way) you can choose 420Hz or 470Hz and works too (I would say even better).

Important is understanding that , sometimes, this is not enough... and if you have big power stuff around (e.g. radar stations, ELF, VLF stations, cables in the ground etc etc etc) your MD will simply fail... no matter which frequency you'll use... cause too much electrical noise around.

Kind regards,
Max

[nelson]

Test Points

Hi. I just had finish my second Delta Pulse. For that i use some old and some new components.
Now i need the test points to check them with the scope.
Regards
Nelson

[okantex]

Hi

I need help

I feed voltage in false diversity to my machine while charging.
battery is our of order now.I got new one but my delta is not working
it's TX part is okay.cause can measure 500volts at coil .but no sound at all

I also built new delta but 2k2 resistor burnt at first trial.and there is no sound at this new one too

is teher anyoffer to find fault .
I want to repair on of them
best regards
Okantex

[Noemio]

Hi

I need help

I feed voltage in false diversity to my machine while charging.
battery is our of order now.I got new one but my delta is not working
it's TX part is okay.cause can measure 500volts at coil .but no sound at all

I also built new delta but 2k2 resistor burnt at first trial.and there is no sound at this new one too

is teher anyoffer to find fault .
I want to repair on of them
best regards
Okantex

Despite what you say, it seems to be something on tx stage. I think your pulse with (TR3) is too large; the maximum value should be no much more than 400 µS. Are you able to test it (have you got an oscilloscope)? Try to verify values of C3 (10nF), R4 (5,6 Kohm) and P3 (20 Kohm).

[Geo]

a device has been priliminary checked and tested. mainly at lake. a place with something metalic at lake bottom was been observed. a device was enough stable.

HH

Hi KT...
Are you in the photo???
Regards

[kt315]

Hi KT...
Are you in the photo???
Regards

hi. not. my buddy.

[Geo]

hi. not. my buddy.

Ok Thanks.
Are you like him ????
Wishes

[okantex]

Hi Neomio

thanks for your reply

I am sure for resistor it is 5k6 and pot is 22k
but not sure form capasitor ,on it it is wirtten as 01J250

seller gave it as 10n to me . is it wrong???

[Noemio]

Hi Neomio

thanks for your reply

I am sure for resistor it is 5k6 and pot is 22k
but not sure form capasitor ,on it it is wirtten as 01J250

seller gave it as 10n to me . is it wrong???

Should be .01, if it's 0.1 it's 100nF.
However, try to check frequency and pulse with!

Ciao

[kt315]

is it wrong???

yep. wrong. you must ask seller to give you 103J250 (why 250 Volts? you can take capasitor on 50 V!). this is 10 nanoFarads what you need of.

[okantex]

Thanks KT
good shot.
it sstart giving sound ,but not regular and clear for metals.

also I burned 2k2 again after correctin 10n .
I need new 2k2 but there is still fault.

thanks for helps

[kt315]

if you mean R5 so its power must be 1 Watt and more. maybe you tune on very big Pulse Width via P3 and this is your problem?

[Noemio]

capacitor

Actually, notation for capacitors could be even different. If you take a look at the picture, these, for example, are three different capacitors with the same value: 10 nF. So, you could find 10n, 103 or .01
For R5, if you can't find at home a resistor of the suitable power, certainly you'll have four resistors of 10K 1/4W. Just connect them in parallel and you'll get a 2,5K 1W...

[diminute]

Somebody have ??¿?¿?

Hi all,

Design (schematic) of deltapulse in some format that PCB Wizard can load ??? I need it.

Thank you,

diminute