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Offline ram
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« Reply #470 on: November 03, 2010, 09:29:20 am »
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that is virtual ground, by tl062.

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Offline danny475
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dont go away when you hunt a expansive thing
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« Reply #471 on: November 06, 2010, 12:45:36 pm »
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which one is the best for good detection and more dippness
the tl062 or tl072
can any one give me the corect data plese ?
thank you all
danny

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« Reply #472 on: November 06, 2010, 12:50:57 pm »
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Hi danny475
        the tl062 = tl072
best time
j.

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« Reply #473 on: November 07, 2010, 08:49:39 am »
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i used tl 082 and tl062 in virtual grnd, just try it if your dp is stable and exactly tuned (working very well) maybe you will noticed a slight effects in tl082.(not too sensitive in my dp) easy to replaced coz i'm using sockets. one thing i've noticed in dp, negative power supply in ic should be very stable neg 10.6 volts. i omitted the two diodes then i replaced it with lm337 adjustable neg regulated power (another small interface circuit) but more stable dp.

regards, ram,

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« Reply #474 on: November 07, 2010, 09:20:28 am »
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Quote:Posted by ram
i used tl 082 and tl062 in virtual grnd, just try it if your dp is stable and exactly tuned (working very well) maybe you will noticed a slight effects in tl082.(not too sensitive in my dp) easy to replaced coz i'm using sockets. one thing i've noticed in dp, negative power supply in ic should be very stable neg 10.6 volts. i omitted the two diodes then i replaced it with lm337 adjustable neg regulated power (another small interface circuit) but more stable dp.


Dear Ram
Please mention all of your experience for increasing the stability, because the main problem for many DP constructions is instability of the circuit.

regards, ram,


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« Reply #475 on: November 07, 2010, 10:24:30 am »
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hello hesamvr, try to chk the negative voltage of the ic (not the negative supply) it should 10.6 negative power and it must be in stable voltage condition, any fluctuation on 10.6vol neg power will cause the dp noisy and unstable, (try to regulate it with neg regulator) , chk the transmitter circuit (the lm556 circuit) if it is stable 100hz-120hz (for deep targets) if frequency is fluctuating it will cause the dp instability (try to make the transmitter stable tune it in correct frequency),

instability in dp is caused by frequency shifting, it will disturbed your adjustments on controls settings and timings. ex, the first time you power on the dp (all controls not adjusted) cause noise then you adjust the controls to eliminate the noise but the noise will comeback and adjust again. in testing dp you should avoid near metals, galvanized roof, electrical lines and other that can cause noise to your dp. or try to review your work maybe have errors, small errors in dp can cause instability.

regards, ram,

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« Reply #476 on: November 07, 2010, 03:35:37 pm »
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heloo
I've built delta pulse put ihave praplem Cry Cry
the irf840 is hot?Huh?
and there is no sond on my pi???


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« Reply #477 on: November 07, 2010, 05:34:34 pm »
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Hi ameen
        as dp ver 6---- test:
        1- R1=470k ,C1=22n ,PR1=220k,R2=6.8k,R3=47K,P3=20K,R4=5.6K.
        2-R5=680 ohm ~ 2.2k----let 1.5k /1W OR 2W.
        3-R6=1K.
        4-test D1=LM556.
        5-test in home with small coil 40cm ,23 tu , 0.5mm.
   no sound
   --------
      1-test T9=bc557
 best time
 j.

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« Reply #478 on: November 07, 2010, 06:27:18 pm »
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hello japanese, is there an single sided fr4 pc boards in your country? and how much,

regards, ram,

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« Reply #479 on: November 07, 2010, 06:38:58 pm »
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Hi ram
  yes it in

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best time
j.

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