This is clearly shown in the diagram. For best
performance the circuit should be built on a PC board with all
components fitted close to each other. The photo below shows the circuit
using a coil etched on the board. This type of coil is totally
unsuitable. It does not have a high "Q" and the range is very
poor. The board cannot be touched as the capacitance of your body
causes the circuit to drift. A wound coil will improve the stability
considerably. See photos below for the details of a wound coil.
A one transistor circuit
Do not use an etched coil
Here is the 1-transistor circuit produced by GuEsTyE.net on a home-made PC board and heat-shrunk so the air-trimmer is
adjustable via a small hole.
The PC board drilled ready for fitting the components
The 10 components (plus heatshrink, battery and wire)
The components mounted on the board
The board ready for fitting into heatshrink
The finished bug with "studs" for the battery
and a cut-out for the air trimmer
At On Air
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