181 lines
9.2 KiB
Plaintext
181 lines
9.2 KiB
Plaintext
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(SENSOR HEAD)
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Soft Iron Core (rod, must fit tightly)
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ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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ÚÄÄïïïïïïïïÄÄ¿
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³ L1 ³
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R1 ³ D1 ³ O +1.5Vdc
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ÚÄ/\/\/\/\ÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄįÅÄÄÄÄ´ R2 ³
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³ ÃÄÄÄÄÄÄÄÄÄÄÄÄ)ÄÄ/\/\/\/\ÄÅÄÄÄÄÄ´ÃÄÄ¿
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ÃÄÄÄÄÄÄÄÄÄ´ÃÄÄÄÄÄÄÄÅÄÄÄÄÄÅ®ÄÄÄÄÄÅÄÄ/\/\/\/\Ä(Ä¿ C6ÍÍÏÍÍ
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ÍÍÏÍÍ C8 ³ D2 ³ R3 ³ ³ ÍÍÍ
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ÍÍÍ ÚÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄ¿ ³ ³ Í
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Í \ 3 2 / ³ ³
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\ / ³ ³
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ÚÄÄÄÄÄÄÄÄÄÄÄÄ\1 (LM4250) / ³ ³
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³ \ A1 / ³ ³
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À/\/\/\/\ÄÄÄÄÄÄ\5 / ³ ³
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-1.5Vdc R11 ÄÄÄÄÄÄÄÄÄÄÄ\4 / ³ ³
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OÄÄÄÄÄÂÄÄÄÄÙ \ 7 /ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³
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ÀÄ´ÃÄÂÄ/\/\/\/\ÄÄÄÄ\8 / ³
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C7 ÍÍÏÍÍ R4 \ / ³
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ÍÍÍ \/ ³
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Í ³6 ³
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ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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³
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ÚÄÄÅ¿
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Shielded³ ³ÃÄÄÄ¿
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ÀÂÄÄ´ ÍÍÏÍÍ
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Cable ³ ³ ÍÍÍ
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³ ³ Í
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ÚÁÄÄ´
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³ ³³
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ÀÄÄÅÙ
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V Plug
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O
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³ Jack
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V to amp box
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(AMP BOX)
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³ ³ From sensor head
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Shielded cable Ä> ÚÄÁÄÄÄÁÄ¿
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ÚÄÄÄÄÄÄ´ ³
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ÍÍÏÍÍ ³ÀÄÄÄÅÄÄÄÙ R6 R5
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ÍÍÍ ÃÄÄÄÄ(ÄÄ/\/\/\/\ÄÂÄ/\/\/\/\Ä¿
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Í ³ÚÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄ¿ ³
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³ \ 3 2 / ³
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³ \ / ³
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-6 OÂÄÄÄÄ(ÄÄÄ\4 (UA741) / ³
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Vdc ÀÄ´ÃÄ´C4 \ A2 / ³
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³ \ / ³
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+6 OÂÄÄÄÄ(ÄÄÄÄÄÄ\ 7 / ³
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Vdc ÀÄ´ÃÄ´C5 \ / ³ *
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³ \ / ³ Û means 'Yes Virginia
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³ \6 / ³ there _IS_ a
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³ \/ ³ connection".
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³ ³ * R13/S1 ³
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ÀÄ/\/\/\/\ÄÄÛÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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R12³ ÀÄ/\/\/\/\ÄÄÄÄÂÄÄÄÄÄ¿
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³ ³ ÍÍÏÍÍ ³
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Shielded >>ÄÄÄÄÄ´ D4 ³ ÍÍÍ C1 ³ ÚÄÄÄ¿
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Jack ÃÄÄÄ¿ Àįſ ³ Í Ú´ÃÄÙ R10 ³Ù Q3³
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ÍÍÏÍÍ ÀÄ´ÃÄ´ ÀÄÄÄÄįÅÄÄÁÄÄ/\/\/\/\ij¿NPN³
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ÍÍÍ ³ C2³ D3 ÚÄÄÄ´ÃÄÙ À>Ä¿³
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Í ÚÄÄÁÄÄ¿³ ÃÄÄÄÄÄÄÄÄÄÄÄÙ³
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Micro Ampere meter³ uA MÃÙ ÍÍÏÍÍ C1 ³
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(circuit optional) ÀÄÄÄÄÄÙ ÍÍÍ ³
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Í ³
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³
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³
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ÚÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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R7 V R14 ³ ³ ³ÚÄÄÄÄUUUUUUUUÄÙ T1
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ÚÄ/\/\/\/\ÄÄ/\/\/\/\ÄÅÄO +6Vdc ³ ³³ ==========
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³ ÚÄ/\/\ÄÄ¿ Ú<ÄÄÄÄÙ ³ ³³ ÚÄïïïïïïïïÄÄÄÄÄÄÄÄÄ¿
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³ ³Ù Q2 R8³³Ù Q1 ³ ³³ ³ ÚÁ¿/³
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ÀÄij¿NPN À´¿PNP ³ ³³ ³ ÀÂÙ\³SPK1
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ÚÄ´ÃÙ À>Ä¿ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄ(ÄÙ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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ÀÄÄÄÄÄÄÄÄ(ÄÄÄÄÄÄÄÄÄÄÄÄ/\/\/\/\ÄÙ ÃÄÄÙ
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C3 ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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R9 ³ ³
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ÚÄÄÄÄÄ´³³ÃÄÄO - 6Vdc
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R13/S1 ³ ³ ³
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ÚÄÄÄÄ¿ (spst) ³
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ÍÍÏÍÍ ³ / ³ ³ ³
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ÍÍÍ ÀÄÄÄO/ OÄÄÄÄÄÄÄÁÄÄÄÄÄ´³³ÃÄÄÄO + 6Vdc
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Í (on pot) ³ ³
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Component Quantity Description
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R1, 3 2 1.5 Meg ohm 1/4 Watt
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R2 1 5.6 Meg ohm 1/4 Watt
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R4 1 10 Meg ohm 1/4 W
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R5 1 1 Meg ohm 1/4 W
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R6, 10 2 4.7 K ohm 1/4 W
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R7 1 1 K ohm 1/4 W
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R8 1 10 K ohm 1/4 W
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R9 1 100 ohm 1/4 W
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R11, 14 2 100 K ohm potentiometer (trimpot)
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R12, 13 2 5 K ohm potentiometer with switch
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C1 1 4.7 uf 25V electrolytic (E) capacitor
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C2 1 1 uf 50V E cap
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C3, 4, 5, 6,
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7, 8 6 .1 uf 25V (ceramic disk type good)
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A1 1 LM4250 nano-amp amplifier
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A2 1 UA741 op-amp
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Q1 1 PN2907 PNP
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Q2, 3 2 PN2222 NPN
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D1, 2, 3, 4 4 1N914 signal diodes
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T1 1 Matching transformer/ 1K/8 ohm (audio)
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2 Phono plugs
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2 Phono jacks
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2 Battery holders (4 "AA")
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1 Battery holder (2 "AA")
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M1 1 100 uA (microampre) Panel meter
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SPK1 1 8 ohm speaker (small)
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CORE 1 Soft iron (ferrite) core. LONG (2 - 3 ft)
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Batteries
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Project boxes to suit your needs
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* L1 is the high voltage secondary of a transformer. Find an oil burner,
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an old flyback from a TV, any coil with as many windings as you can find.
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The more windings the better. (Thousands are in flyback secondaries).
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The CORE fits snugly into the center of L1 (or must be secured with
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glue).
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Adjust R11 for ZERO volts on pin 6 of "A2" (referenced to ground).
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Adjust R12 to control meter deflection (may also hook jack to voltage sensor
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type trigger circuit).
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Adjust R13 for desired sensitivity of audio alarm (if used).
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Adjust R14 for clean tone (if audio section used).
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This circuit, although I have used portions of it many times, is
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considered (by me anyway) untested. The principles are sound and I
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have found the sections I have used quite effective when modified
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for my own purposes.
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This circuit will, when properly constructed (shielding VERY
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important) will detect any nearby disturbance of the earths
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magnetic field. A vehicle passing by, for example, will cause an
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audible tone and send the meter to max deflection. I suppose
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it would also have no problem, if placed on a path in the bush,
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detecting persons walking nearby, if, of course, they carried
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any fair amount of metallic objects. (HINT HINT!)
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I recommend that you orient this device (the CORE) in an EAST to
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WEST direction. That will pick up the best disturbance of the field.
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Also, use the shielded cable idea to separate the head as far away
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from the amplifier box as possible/practical, and find as LARGE a
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piece of ferrite rod (or soft iron) as you can (3 feet good).
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This unit is very sensitive when assembled/installed/adjusted
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properly. Do not attempt to use this circuit near airports, as
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the device, under the proper conditions, may constantly trigger
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because of the low flying aircraft (ANOTHER HINT!).
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******************* DISCLAIMER DISCLAIMER DISCLAIMER *******************
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BUILDERS- If you have any comments (constructive please, life's
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enough of a pain in my ass already) please foreword them to the
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system operator or individual you obtained these schematics from.
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"COMMANDERS" this circuit contains what could be considered
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'proprietary' designs. It is submitted as anonymous (sp?!) I
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would, however, be interested in any constructive feedback.
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Have fun. Stay safe. Survive.
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"ALL" I have tried to be as faithful as I could transposing
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these plans to a plain ascii form. There are NO guarantees however.
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Use this AT YOUR OWN RISK. If you build this and it turns out
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to be a subspace phase shifter and your entire world goes
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PFZZZT when you turn it on...... Oh WELL !
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ah |