75 lines
3.6 KiB
Plaintext
75 lines
3.6 KiB
Plaintext
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RF Sniffer/BUG Detector <.5 to >500 MHz.
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+----+-----------+----------------+-------+
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A N T + | | | | |
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________ 22 --- | | | | P.B.
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\ | / uF --- | | | o SW 1
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\|/ | | | Q2 PNP | \
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| --- | / 2N | o \
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| L1 GND | R5 \ 2907 | |
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| 4.7uH | 10K / | |
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+--()()()-+--/\/\/\--)--+ \ R6 E / ---
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| | R3 4.7K | | Q1 NPN | 4.7K |/ = B1
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| D1 --- | | 2N +---/\/\/\---| --- 9VDC
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--- 1N270 --- C3 | | 3904 | |\ =
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^ Ge | .01 / | / \ |
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| --- uF R4 \ | |/ | +---+
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| GND 22K / +----| +----+------+ |
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| \ |\ | | |
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+-----+--/\/\/\-+ | E \ \ | |
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| | R1 2.2K | | | / R7 ====== |
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--- --- | \ --- \ 1K | BZ1| |
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--- --- +--->/ GND / | ~~ | |
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| C1 | C2 R2 \ | ====== |
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| .001| .01uF 10K | V LED1 | |
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------+--------------+ --- >>> | |
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| | | |
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--- +-----+-----+-----+
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GND |
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---
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GND
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LEGEND: + = Connection
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) = No Connection
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GND = Ground
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Parts List
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ANT = Radio Shack Cat No. ? to fit project. 24 inches or so long.
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B1 = Battery, 9 volt transistor radio, clip-on terminals, and mounting brkt.
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BZ1 = Radio Shack Cat No. 273-074
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C1 = .01 uF ceramic, 50V or higher
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C2 = .001 uF ceramic, 50V or higher
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C3 = .01 uF ceramic, 50V or higher
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D1 = 1N270, 1N34A, or other Germanium signal diode.
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L1 = 4.7 uH RF Choke
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LED = RED LED Flashing LEDs don't need R7, and will reduce battery drain
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considerably. It has to be a red LED for warning! No? Well..
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Q1 = 2N3904 or other NPN high gain gen'l purpose, such as PN2222A, etc.
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Q2 = 2N2907 or other PNP high gain gen'l purpose, such as 2N3906, etc.
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All resistors are 1/4 Watt unless otherwise stated.
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R1 = 2.2K 5%
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R2 = 10K trimmer pot, PCB mount
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R3 = 4.7K 5%
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R4 = 22K 5%
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R5 = 10K 5%
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R6 = 4.7K 5%
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R7 = 1K 5% or to suit LED brightness and battery drain. Minimum 470 ohms,
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except if you use a blinking LED with built-in current limiting.
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SW1 = Switch, SPST (single pole, single throw) push button to save bat-
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teries. Miniature preferred.
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MISC: Case, plastic.
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PC board to mount components on (R-S cat no. 276-148 is ok).
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Hookup wire, 24 gauge.
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Note: Keep diode and capacitor leads short to minimize stray inductance.
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Comments: This circuit isn't very sensitive, and could use a good
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wideband RF amp between the antenna and the detector diode.
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