Picture of Long range spybug.
I am going to show you a step-by-step process to building a spybug from common electrical componenets.
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Step 1: Components

Picture of Components
Components list


  1. C1  1n disk capacitor (102) 1 pc.
  2. C2  5.6pF disk capacitor(562) 1 pc.
  3. C3, C4 10 uF Elec. Capacitor(25-50v) 2 pcs.
  4. C5 3-18 Trimmer Capacitor 1 pc.
  5. R1 330 ohm 1/8 w  Resistor 1 pc.
  6. R2, R5, R6 4.7k 1/8 w Resistor 3 pc.
  7. R3 10k 1/8 w Resistor 1 pc.
  8. R4 100k 1/8w Resistor 1 pc.
  9. Q1, Q2 2N2222 NPN Transistor 2 pcs.
  10. L1, L2 5-6 turns copper coil 2 pcs.
  11. 10mm Electret microphone 1 pc.
  12. 9v battery and clip

     All Resistors can be substituted with 1/4 watt. The transistor can be substituted with a 2n3904-06 transistor. 

Step 2: Schematic

Picture of Schematic
Here's the schematic, any questions leave them I will answer quickly as possible.

Step 3: PCBV layout

Picture of PCBV layout
Here is a picture of the PCB that I made for this spybug, or you could just make it on perfboard if you want. 

Step 4: Resistors

Picture of Resistors
First I soldered the resistors on just below where the mic will go. These are R5 & R6.

Step 5: Adding components

Picture of Adding components
Next I add C4 (10 uF cap), Q1,Q2 (2n3904 transistor) & R4 (100k)

Step 6: Adding components

Picture of Adding components
Next step I add the electret microphone, and the two coils. The coils should be wrapped around a 1/4 inch drill bit 6 times to get the coil needed for this project.

Step 7: Adding components

Picture of Adding components
Now I add C1 (102) capacitor, R1 (330 ohm res.), R3 (10k res.) and C4 ( the other 10uF capacitor)

Step 8: Adding componenets

Picture of Adding componenets
In this step I add the last resistor (R2), then I checked to se if every coponent is where it should be just to be sure.

Step 9: Adding the Trimmer, etc.

Picture of Adding the Trimmer, etc.
Finally comes the trimmer cap, the battery connector and the antenna wire. I chose to use a braided copper wire for this antenna just to try it but you can use whatever you like.

Step 10: Next week the FM phone bug.

Picture of Next week the FM phone bug.
Next week I will be adding a new Instructable, the FM phone bug. This will hook up to one of the 2 phone lines
biraj100211 months ago
Cliffyd I maid ot the photo I post but it could not work why? Reply me soon.
biraj100211 months ago

i made it but it coudn't work why tell me why?

biraj100211 months ago
I made one but could not work. Why? Tell me. I made as U told in the diagram
Rendydevara4 years ago
how far is ? (the range)
cliffyd (author)  Rendydevara4 years ago
100 meters
dagob cliffyd1 year ago

Is 100mt a long range?

matstermind4 years ago
it says "5-6 turns of .5 dia wire" what measurement is .5?
i meant is it in milimeters, or other type of measurement
i think im on the wrong page/thread
bigfun4 years ago
i have no idea what frequency this broadcasts at. is this just supposed to be obvious? i'm going to assume 100 MHz until you say something else. Hmm, that doesn't work. there are a lot of frequencies out there...
cliffyd (author)  bigfun3 years ago
No sorry try around 88-94mhz
wow, now I can do surveillance on beehard44 (lol, pun intended)
this is supposed to be our communications in sierra charlie hotel *CENSORED CENSORED* lima, riiight?
uuh, roger that hotel-bravo-four-four. you forgot to mention we needed 2 coils, or did you make another version?over. (all pun intended)
cliffyd (author)  nutsandbolts_644 years ago
uhhhh # 10 says 2 coils, is that what you mean?
Oh, I didn't see that there.... Now, all I have to do is get that other ceramic capacitor that messed up my circuit and put it where it belongs... then solder.... I should have breadboarded it before I began soldering. Thanks for the correction.
aviksaras4 years ago
what's mit
aviksaras4 years ago
what number is the PCB
Barramundi4 years ago
could you post a pdf of the pcb artwork
matstermind4 years ago
one more thing, for the 5.6 cap, 5.6 what? pf,uf,...? can you give me a link to the one you bought? thanks
is this help ?
not really, thanks anyway