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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) >

TO ALL THE DIFFERENCES BETWEEN DPB2010,DELTAPULSE,PULSESTAR-BG

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steaua581

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #40 on: August 29, 2010, 05:54:52 am »

Hello Eugene and forum,
I have a question regarding the resistors used in DP circuit i know r23,24,25,26 =4.7k tolerance 0.1%! exact value! (i was using 1% tolerance ...you think thats why i"ve got poor detection+ instability? ...Also what do you sugest on all other Resistors besides the (r23,24,25,26 0.1%) to use 1% or 5% ? ...What is your experience on this componets tolerance and Watt 1/4W 2/4W and so on?? Especially for the final Resistors R5&R6 i"ve seen they are allways associated with the sensitivity of DP>>>

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #41 on: September 02, 2010, 04:49:54 am »

Hi steaua581
i put for you and any builder to delta pulse the block diagram to help you
if you need any thing i replay you.
best time
j.

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steaua581

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #42 on: September 02, 2010, 06:24:00 am »

hello Japanese,
In my previous question i was refering to the resistors used in this circuit r23,24,25,26 =4.7k tolerance 0.1%!... exact value! (i was using 1% tolerance ...you think thats why i"ve got poor detection?+ instability? ...Also what do you sugest on all other Resistors besides the (r23,24,25,26 0.1%) to use 1% or 5% ? ...What is your experience on this componets tolerance and Watt 1/4W 2/4W and so on?? Especially for the final Resistors R5 & R6 i"ve seen they are allways associated with the sensitivity of DP>>>

Regards

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #43 on: September 02, 2010, 07:31:28 am »

Hi steaua581
Timer:(556) generate signal from 100hz to 400hz debends on R1 & R2,C1

Power :to coil(irf740):that control the FET to the coil to produce ele. magnatic field (tx). the tx reflected on the serface on the target (RX).

Receiving:Rx recived by LF357 and amp.

Delay:(4538) make delay in time between tx-rx.

AMP:(tl062-4066) there are two inputs are Amplified , compared and swished.

OUT: py sound (555),VU (meter).

After explanation all parts of the block diagram by esay way that appear the important
part after timer part is AMP part . it consistes of alot of ops & resistances confirm the amplefecation factor to each op by exact value of each resistance
we get good signal used in 4 stges amplefecations + 1 comparator.
each op has 2 resistance calculate the out amp.

best time

j.

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #44 on: September 02, 2010, 07:23:14 pm »

what he questioned is the precision resistor tolerance, in schematic it should use precision resistor to get the exact tuned circuit.

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #45 on: September 02, 2010, 07:32:31 pm »

R23--R26 0.1% and all resistance arawend op must at lest 1% to get amplification good
BEST TIME
J.

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steaua581

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #46 on: September 03, 2010, 12:22:56 am »

Thanx Japanese and Ram,
I forgot to ask also about capacitors used in this circuit i"m using also them at 10%.??..did not find at the time to buy them at smaller tolerance. I have buit a prototype so i can change componets a lot easyer so i can experiment with different components.
Should i use capacitors at 5% or less will that solve drifting in circuit?
Unfortunately i dont have an osciloscope ...i"m planing to buy a little one since the biger professional one are so expensive...

regards

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #47 on: September 28, 2010, 03:35:44 am »

Hi Steaua 581 all cap.MK,MYLAR AT LEST 5%.
TO an oscliscop you can use (in google) soft to use sound card in your com. &
mic jak ended by brrop. nowyou have an oscliscop.

best time
j.

Hi Steaua 581 tolerance table

The connection & the soft name BIP Electronics Labs 3.0 - Oscilloscope
what you mean ..... poor detection?+ instability?

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #48 on: October 16, 2010, 09:25:45 am »

The good detection from: 1-you must use (lf357-356-tl071). 2-The coil 1x1m 16turn 0.5mm at f=100 hz or 120 hz,R5=>1k/1w.
3-The coil 40cm 23turn 0.5mm at f=300~400 hz R5=680 ohm/1w.
4-you must use (tl062-072,CD4538-CD14538,CD4066).
5-All cap. nano you use MK,MYLAR. For pico use ciramic c13,c17.
6-ALL TR 557 USE BC557C ,ALL TR 546 USE BC546B .
7-with big coil use manual tune .

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	Re: TO ALL THE DEFERANCES BETWENN DPB2010,DELTAPULSE,PULSESTAR-BG « Reply #49 on: October 16, 2010, 10:03:50 am »

Thank you japaneese!

I"m taking into count all you have sayed.
I want to ask you what kind of wire cable do you sugest to use between the coil and detector ?.. Should be best used microphone wire ? .. and what kind..?

Regards
Marius

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