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I am going to show you a step-by-step process to building a spybug from common electrical componenets.
Components list Part C1 1n disk capacitor (102) 1 pc. C2 5.6pF disk capacitor(562) 1 pc. C3, C4 10 uF Elec. Capacitor(25-50v) 2 pcs. C5 3-18 Trimmer Capacitor 1 ...
Here's the schematic, any questions leave them I will answer quickly as possible.
Here is a picture of the PCB that I made for this spybug, or you could just make it on perfboard if you want.
First I soldered the resistors on just below where the mic will go. These are R5 & R6.
Next I add C4 (10 uF cap), Q1,Q2 (2n3904 transistor) & R4 (100k)
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 ...
Now I add C1 (102) capacitor, R1 (330 ohm res.), R3 (10k res.) and C4 ( the other 10uF capacitor)
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.
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 ...
Next week I will be adding a new Instructable, the FM phone bug. This will hook up to one of the 2 phone lines
All Resistors can be substituted with 1/4 watt. The transistor can be substituted with a 2n3904-06 transistor.
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