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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

deltapulse

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	Re: deltapulse « Reply #10 on: July 10, 2010, 08:57:30 am »

hi
eugene can you explain about yours new circuit detection depth ?

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Eugene52

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	Re: deltapulse « Reply #11 on: July 10, 2010, 02:26:00 pm »

	Quote:	Posted by fidamohd82
no i do not have it i am sorry Eugene and thanks about 5438

Hello again . CD4528 can be used but check data sheet first .
Here are 2 alternatives to LF357 :

HH..........Eugene

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	Re: deltapulse « Reply #12 on: July 21, 2010, 05:04:23 pm »

thanks Eugene
thank you for all your effort

fidamohd
hi again Eugene
the lf i found is lf357n which " 2.8 $"
the bat i found is 6v 4.0ah
can i substitute tl062 by tl072

fidamohd

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	Re: deltapulse « Reply #13 on: July 21, 2010, 08:26:39 pm »

	Quote:	Posted by fidamohd82
thanks Eugene thank you for all your effort fidamohd hi again Eugene the lf i found is lf357n which " 2.8 $" the bat i found is 6v 4.0ah can i substitute tl062 by tl072 fidamohd

Hello . For LF357 use AD844,LF411,NTE937M .

For TL062 dual JFET use TL072 . TL072 is lower noise but draws more current .

Regards.............Eugene

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	Re: deltapulse « Reply #14 on: July 21, 2010, 08:53:59 pm »

i have all ready baught th lf357n
but i am concern about the current of the batt is this ok to have two 4.0ah batt

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	Re: deltapulse « Reply #15 on: July 21, 2010, 09:27:57 pm »

	Quote:	Posted by fidamohd82
i have all ready baught th lf357n but i am concern about the current of the batt is this ok to have two 4.0ah batt

Hello . 2 [6 volt batteries] in series should run your Delta pulse for 20 hours minimum to 30 hours maximum . And you can connect a 500 ma [milliamp] fuse for safety . Just guessing the weight of the 2 batteries might be almost 4 pounds so put them in a nice little bag with a shoulder strap . And hopefully they are leak proof batteries !!

HH............Eugene

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	Re: deltapulse « Reply #16 on: July 21, 2010, 09:51:58 pm »

ok thanks for the fuse idea
i use my DIGITAL MUTIMETER to muser the current its too hight even the meter wire too hot is it ok
or like the hammerHEAD 8 of 1.5 volts batt will do ?

fida alawneh

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	Re: deltapulse « Reply #17 on: July 22, 2010, 06:57:27 am »

	Quote:	Posted by fidamohd82
ok thanks for the fuse idea i use my DIGITAL MUTIMETER to muser the current its too hight even the meter wire too hot is it ok or like the hammerHEAD 8 of 1.5 volts batt will do ? fida alawneh

check T1 =IRF740 , is it hot ? Pulse width is too wide . Coil [dc resistance] too low . If you used final schematic and final pcb board and all correct parts , it should work Great !!!

Regards............Eugene

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	Re: deltapulse « Reply #18 on: August 14, 2010, 03:16:03 pm »

ok thanks Eugene

fida alawneh
hi
when i connect the bat. there is sound coming out and the scale going to the middel then i bush tune the scale return nearly to zero

but when i but any metal under the coil no effect at all

so what is the problem might be

fida alawneh

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	Re: deltapulse « Reply #19 on: August 14, 2010, 10:39:33 pm »

Hello . Correct potentiometer values / Correct diode direction [polarity] . Power is correct polarity at IC supply pins , IC chip inserted correctly [pin numbers are correctly configured with schematic ] , LM556 frequency ok ? Opamp resistors R23,R24,R25,R26 are 0.1 % precision resistors ?

Best Regards..........Eugene

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