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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ﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛﾛ
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ﾚﾄﾄ<EFBE84><EFBE84><EFBFBD><EFBFBD>ﾄﾄｿ
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ｳ L1 ｳ
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R1 ｳ D1 ｳ O +1.5Vdc
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ﾚﾄ/\/\/\/\ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄﾄﾄﾄﾄﾄｯﾅﾄﾄﾄﾄｴ R2 ｳ
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ｳ ﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ)ﾄﾄ/\/\/\/\ﾄﾅﾄﾄﾄﾄﾄｴﾃﾄﾄｿ
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ﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄｴﾃﾄﾄﾄﾄﾄﾄﾄﾅﾄﾄﾄﾄﾄﾅｮﾄﾄﾄﾄﾄﾅﾄﾄ/\/\/\/\ﾄ(ﾄｿ C6ﾍﾍﾏﾍﾍ
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ﾍﾍﾏﾍﾍ C8 ｳ D2 ｳ R3 ｳ ｳ ﾍﾍﾍ
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ﾍﾍﾍ ﾚﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄｿ ｳ ｳ ﾍ
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ﾍ \ 3 2 / ｳ ｳ
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\ / ｳ ｳ
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ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ\1 (LM4250) / ｳ ｳ
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ｳ \ A1 / ｳ ｳ
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ﾀ/\/\/\/\ﾄﾄﾄﾄﾄﾄ\5 / ｳ ｳ
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-1.5Vdc R11 ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ\4 / ｳ ｳ
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Oﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾙ \ 7 /ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ｳ
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ﾀﾄｴﾃﾄﾂﾄ/\/\/\/\ﾄﾄﾄﾄ\8 / ｳ
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C7 ﾍﾍﾏﾍﾍ R4 \ / ｳ
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ﾍﾍﾍ \/ ｳ
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ﾍ ｳ6 ｳ
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ﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
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ｳ
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ﾚﾄﾄﾅｿ
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Shieldedｳ ｳﾃﾄﾄﾄｿ
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ﾀﾂﾄﾄｴ ﾍﾍﾏﾍﾍ
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Cable ｳ ｳ ﾍﾍﾍ
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ｳ ｳ ﾍ
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ﾚﾁﾄﾄｴ
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ｳ ｳｳ
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ﾀﾄﾄﾅﾙ
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V Plug
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O
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ｳ Jack
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V to amp box
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(AMP BOX)
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ｳ ｳ From sensor head
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Shielded cable ﾄ> ﾚﾄﾁﾄﾄﾄﾁﾄｿ
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ﾚﾄﾄﾄﾄﾄﾄﾂｴ ｳ
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ﾍﾍﾏﾍﾍ ｳﾀﾄﾄﾄﾅﾄﾄﾄﾙ R6 R5
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ﾍﾍﾍ ﾃﾄﾄﾄﾄ(ﾄﾄ/\/\/\/\ﾄﾂﾄ/\/\/\/\ﾄｿ
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ﾍ ｳﾚﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄｿ ｳ
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ｳ \ 3 2 / ｳ
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ｳ \ / ｳ
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-6 Oﾂﾄﾄﾄﾄ(ﾄﾄﾄ\4 (UA741) / ｳ
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Vdc ﾀﾄｴﾃﾄｴC4 \ A2 / ｳ
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ｳ \ / ｳ
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+6 Oﾂﾄﾄﾄﾄ(ﾄﾄﾄﾄﾄﾄ\ 7 / ｳ
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Vdc ﾀﾄｴﾃﾄｴC5 \ / ｳ *
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ｳ \ / ｳ ﾛ means 'Yes Virginia
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ｳ \6 / ｳ there _IS_ a
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ｳ \/ ｳ connection".
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ｳ ｳ * R13/S1 ｳ
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ﾀﾄ/\/\/\/\ﾄﾄﾛﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
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R12ｳ ﾀﾄ/\/\/\/\ﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄｿ
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ｳ ｳ ﾍﾍﾏﾍﾍ ｳ
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Shielded >>ﾄﾄﾄﾄﾄｴ D4 ｳ ﾍﾍﾍ C1 ｳ ﾚﾄﾄﾄｿ
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Jack ﾃﾄﾄﾄｿ ﾀﾄｯﾅｿ ｳ ﾍ ﾚｴﾃﾄﾙ R10 ｳﾙ Q3ｳ
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ﾍﾍﾏﾍﾍ ﾀﾄﾂｴﾃﾄｴ ﾀﾄﾄﾄﾄﾄｯﾅﾄﾄﾁﾄﾄ/\/\/\/\ﾄﾂｳｿNPNｳ
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ﾍﾍﾍ ｳ C2ｳ D3 ﾚﾄﾄﾄｴﾃﾄﾙ ﾀ>ﾄｿｳ
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ﾍ ﾚﾄﾄﾁﾄﾄｿｳ ﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙｳ
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Micro Ampere meterｳ uA Mﾃﾙ ﾍﾍﾏﾍﾍ C1 ｳ
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(circuit optional) ﾀﾄﾄﾄﾄﾄﾙ ﾍﾍﾍ ｳ
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ﾍ ｳ
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ｳ
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ｳ
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ﾚﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
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ｳ ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
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R7 V R14 ｳ ｳ ｳﾚﾄﾄﾄﾄUUUUUUUUﾄﾙ T1
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ﾚﾄ/\/\/\/\ﾄﾄ/\/\/\/\ﾄﾅﾄO +6Vdc ｳ ｳｳ ==========
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ｳ ﾚﾄ/\/\ﾄﾄｿ ﾚ<ﾄﾄﾄﾄﾙ ｳ ｳｳ ﾚﾄ<EFBE9A><EFBE84><EFBFBD><EFBFBD>ﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
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ｳ ｳﾙ Q2 R8ｳｳﾙ Q1 ｳ ｳｳ ｳ ﾚﾁｿ/ｳ
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ﾀﾄﾄﾂｳｿNPN ﾀｴｿPNP ｳ ｳｳ ｳ ﾀﾂﾙ\ｳSPK1
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ﾚﾄｴﾃﾙ ﾀ>ﾄｿ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄ(ﾄﾙｳ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
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ﾀﾄﾄﾄﾄﾄﾄﾄﾄ(ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ/\/\/\/\ﾄﾙ ﾃﾄﾄﾙ
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C3 ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
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R9 ｳ ｳ
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ﾚﾄﾄﾄﾄﾄｴｳｳﾃﾄﾄO - 6Vdc
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R13/S1 ｳ ｳ ｳ
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ﾚﾄﾄﾄﾄｿ (spst) ｳ
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ﾍﾍﾏﾍﾍ ｳ / ｳ ｳ ｳ
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ﾍﾍﾍ ﾀﾄﾄﾄO/ OﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄｴｳｳﾃﾄﾄﾄO + 6Vdc
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ﾍ (on pot) ｳ ｳ
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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 |