Delta Pulse

[Max]

KT315 , Great Work on the Delta Pulse !!!! Also , I searched several months ago to see if "Elbombaci" had his Delta Pulse "LCD circuit board" schematic posted on his forum or anywhere else. No he did not , and I think he will not !!! He may be selling Delta Pulse with LCD readouts for a living . Or we would have see the Schematic posted here on Geotech Already !!!!!! It can be seen only on Utube , being tested . Elbombachi is a member of this forum , but under a different User name. Yes it would be cool to have the LCD screen , but the Delta Pulse works just as great with an analog meter ...............Thanks again KT315 ....................Eugene

I really don't understand the purpose of having an LCD screen attached to DP.

Maybe my limitation...

Kind regards,
Max

[aft_72005]

Hi Max
As I saw in picture, my knowledge seems as only instead of analog meter.
Convert analog amount by mcu to digital (A/D) and then
Display by LCD .seem you I don’t know or may be has more facilities.
Best regards.

[Noemio]

coil inductance value

Hi all,

a few months ago I built DP and it works good.
Now I'm going to build a larger coil; it's 25 cm diameter and 45 turns with 0,8 wire diameter.
Both calculations and meter ( ) give me about 1200 uH.
Could be too much? Should I take away some windings?

Thank you in advance

[Max]

Hi all,

a few months ago I built DP and it works good.
Now I'm going to build a larger coil; it's 25 cm diameter and 45 turns with 0,8 wire diameter.
Both calculations and meter ( ) give me about 1200 uH.
Could be too much? Should I take away some windings?

Thank you in advance

Hi,
maybe is better if you try with 20-22turns there for 25cm diameter. Less if required.

Too much inductance and you cannot stay low on first delay settings... so missing much good stuff like small gold.

Kind regards,
Max

[Farhad]

Hi evryone , i have a question . two years ago i made a metal detector.
name it is miner 4 . it is germany of metal detector . i made it without
coil . but my miner 4 trun on and lcd show stage select language (eng / germ)
when i choose a language and press enter key lcd show nothing and i must restart metal detector
and replay job and restart metal detector . i was cunfused about this problam .
do you know information about this metal detector (miner 4) & problam me ?
thank you

[Max]

Hi evryone , i have a question . two years ago i made a metal detector.
name it is miner 4 . it is germany of metal detector . i made it without
coil . but my miner 4 trun on and lcd show stage select language (eng / germ)
when i choose a language and press enter key lcd show nothing and i must restart metal detector
and replay job and restart metal detector . i was cunfused about this problam .
do you know information about this metal detector (miner 4) & problam me ?
thank you

Hi,
I don't know about it... but, have you tryed with a coil there ?

If the MCU check for some signal and the absence of coil would suppress it... you'll probably get such kind of behaviour... device froze waiting for something that never happens...unless software developer made proper error handling for that... that seems unlikely.

Try to test with a coil... if you didn't already, probably it will work.

Kind regards
Max

[Unregistered]

The Miner 4 should enter Demo Mode after running 1 minute without Coil.
(Thats what the manual says, i dont have one).
If you have more Questions, please create your own Thread, this one is about Delta Pulse.
Good Luck with your Project.

[Uykusuz]

You can reach LCD circuit for Delta Pulse from this link.

http://www.teknolojiekibi.com/yeni/i...p?topic=1180.0

[nelson]

Hi my friend and thanks for your big contribution to the forum.
Indeed has many of us, i was looking for an LCD to this detector, so this looks good to me and i knw to many members here.
Best regards from Santiago, Chile.
Nelson

You can reach LCD circuit for Delta Pulse from this link.

http://www.teknolojiekibi.com/yeni/i...p?topic=1180.0

[Mullihaka]

Dumping resistor value, noise pot problem?

I have a 27 turn, 25cm diameter coil of 0.5mm enamel insulated copper wire. What would be a good value for the dumping resistor? I started with 2k2, added another, then third in parallel. I couldn't find any difference in the detection distance in the air. It's about 20cm for 2euro coin.

The 20k noise pot can only be turned only tenth of the turn, otherwise the FET remains on most of the time, the duty cycle being close to 95%, measured at the gate of the FET. Can this be caused by ringing of the coil due to too high dumping resistor value?

All hints appreciated.

[kt315]

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

[erolunall]

http://www.teknolojiekibi.com/yeni/i...p?topic=1180.0


LCD circuit for delta by elbombacı

you can find all infoo savefiles link on first mail

Regards
Erol

[Noemio]

4538

Hi all,


Since I was not able to find a couple of 4538 , I used a 4538 for U2 and a 4098 for U3.
This results in a different pulse duration on T4 and T5.
The outcome of this may be the cause for which the device is not working?
In this case, is it possible, therefore, that even 4538 from different manufacturers used together on this circuit may produce enough magnitude in different pulse duration to compromise detector functionality?


Not sure, moreover, why KT315 refers to industrial frequency:

"...the working frequency must be ABSOLUTELY PRECISELY 100 PPS. or what you have industrial frecuency multiplied on TWO. if you have 60Hz than you must have 120 pps..."


Anyway, for 50 Hz, working frequency could be even 150 or 200 Hz?


TNXE6

[kt315]

---quote---
Hi John,
Here is a copy of a post I made a couple of years ago which deals with this subject.
RELEVANCE OF PULSE FREQUENCY in a P.I. DETECTOR.
A question that is often asked about P.I. detectors is the relevance of the pulse frequency. Some detectors run at a hundred or so pulses per second while others run at several thousand. The first archaeological detectors I worked on ran at 22 p.p.s. In later versions we upped it to 43, then 170. The important thing was to avoid the same frequency as power lines, 50Hz in the UK, 60Hz in the US. Multiples of the power frequencies also had to be avoided e.g. 100 or 120. Severe beat note interference would result if the detector and power frequencies coincided; that is if you were anywhere near power lines as is often the case in the UK.
P.I. detectors running at low frequencies usually pulsed high currents through the coil, 5 - 10 amps being a typical figure. The on / off time ratio of the pulses was high so the average current drawn from the battery would be 100 - 200 milliamps.
Many of todays detectors favour much higher pulse frequencies. This puts the detector well away from power line interference but low frequency radio transmitters can then start to cause problems. Faster pulse rates also have the advantage in that the response of the detector can be made more rapid, which aids in pinpointing an object. Fast pulse rates require that the pulse current be less, otherwise things would start to run hot and the battery life would be rated in minutes. The pulse current can be restricted by a lower transmitter voltage but more usually by a resistor in series with the coil or by making the coil more resistive by using finer wire. 0.1 - 1 amp pulse currents being typical. One major factor in determining pulse current is acceptable battery life. With rechargeables 5 - 10 hours is OK, while standard alkaline cells would be expected to give 15 - 25 hours for the cost to be acceptable. One or two recent detectors on the market appear to have energy recovery circuits which make the transmitter more efficient and significantly increase battery life.
The pulse frequency has little effect on detector performance; one running at 170 p.p.s. could have the same range as one running at 5000 p.p.s. but there are many inter-related factors that determine the final performance, not least the design of the receiver circuit.
Hope this helps. I favour higher pulse rates (1500 - 5000) in my current designs.
Eric.

[Noemio]

4538

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