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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) >

a simple PI detector schematic

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zinteredi

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	Re: a simple PI detector schematic « Reply #40 on: September 10, 2014, 06:46:46 pm »

hi to all
this is my new sand banks pcb
To make Toko
You must use a diode and a capacitor and an inductor as my pcb

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	Re: a simple PI detector schematic « Reply #41 on: September 10, 2014, 08:03:43 pm »

	Quote:	Posted by zinteredi
hi to all this is my new sand banks pcb To make Toko You must use a diode and a capacitor and an inductor as my pcb

Could you please post the Schematic?

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zinteredi

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	Re: a simple PI detector schematic « Reply #42 on: September 15, 2014, 06:05:40 am »

part list:

R1 1.5 k
R2 47 k
R3 1.2k
R4 330
R5 470
R6 100
R7 470
R8 47
R9 1 k
R10 4.7
R11 330
R12 1k
R13 1k
R14 1.5k
R15 220 k
R15 1M
R17 100 K
R18 1.5M
R19 330
R20 10K
R21 220
R22 220 K
R23 47 K
R24 1.2 M
R25 220 K
R26 10 K
R27 17K
R28 10 K
R29 220
R30 1.5 K
R31 1.6 +16 K
R32 220K
R33 47 K
R34 47 K
R35 100 K
r36 10 K
R37 1K
R38 2.2 M

VR1 100K
VR2 100K

C2 47nf
c1a,c1b 220uf 16v
c3, c22 100nf
c17,18,19,20 1nf
c11,c9,13 22uf 16v tantalium
c10 100nf
c12 470nf
c5 33 nf
c7 10pf
c8 3.3 Pf
c4,c6,c16 47uf 16v

d1,d4 1n4007
d2,d3 1n4148

L1 LOP

L2 8uH 11 ohm

IC1 555
IC2 79L05
IC3,7 4011BE
IC4 709
IC5 741
IC6 555
IC8 78L12

TR2 TIP41
TR1 BC327
TR3 BC337
TR4 BF256
TR5 BC337
TR6 2N5460

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	Re: a simple PI detector schematic « Reply #43 on: September 15, 2014, 06:59:00 am »

Can you clarify the Voltage Doubler circuit Please. I think that is what it is. How you Connected.

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	Re: a simple PI detector schematic « Reply #44 on: September 15, 2014, 04:51:56 pm »

IC supply voltage:-5v & +12v
toko output voltage:19v or more

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	Re: a simple PI detector schematic « Reply #45 on: April 03, 2018, 03:54:04 pm »

Hi
I am thinking of building the sandbanks pulse induction metal detector, and came across your post about the circuit. I have a few questions about the components listed,
Can you please tell me what the part marked L1: LOP is as I cannot find it on the PCB.
Also on the PCB the component next to L2 appears to be a ceramic disc capacitor, but I am unable to work out the value of it.

Many Thanks
Graham

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	Re: a simple PI detector schematic « Reply #46 on: April 03, 2018, 05:02:04 pm »

Are you referring to the Original Sands Bank or this Mod ?

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	Re: a simple PI detector schematic « Reply #47 on: April 04, 2018, 02:36:27 am »

Hi
I am looking at the mod for the Sandbanks circuit; I have looked at the new parts list and the new PCB layout. The part for the new charge pump circuit, it looks like it’s a ceramic disc capacitor next to L2 .I cannot see the part number on the PCB layout or any mention of it in the parts list, but it is shown in a photo of the new parts. Also in the parts list L1 is shown as LOP? I may have missed something “the more you look the less you see”.

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	Re: a simple PI detector schematic « Reply #48 on: April 04, 2018, 07:31:01 am »

The cap is not that importants on the value as long as it gets the Voltage Pump / Bucking circuit singing. Just Bread Board the Pump circuit and have a play at it.

There are a number of simple PI circuits available that are better and less head issues to build. Hell Winding your own Transformer for the original circuit would be easier then monkeying around with this one I think.

Other PI's like the little Barracuda are much better detectors and just as easy to build.

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