Dazaro3 shows us how to make a Tiny Surveillance Spy Bug in this video. Dazaro3 makes the PCB using the toner transfer method. Since the board is very small (9mm X 9mm) and the parts and even smaller assembling the thing looks very difficult! The result is a super small device though.
“Parts used:
Home made PCB ,9mm X 9mm
SMD 2N3904 transistors x 1
 (All capacitors and resistors are SMT 805)
1nf ceramic capacitor x 1
10pf ceramic capacitor x 2
33pf ceramic capacitor x 1
22nf axial ceramic capacitor x 1
1 – 5p to 30p air trimmer
100R resistor
5.6K resistor
3mm Mic
165cm antenna
CR2032Battery holder”