For a simple wireless FM bug you could use this circuit.
/ 100k 1/2 W
----------o/ o--------/\/\/\/\/\------+ _______
| | ________ | \ | /
- | / \ | \|/
--- C \/ \ | | 6" or so
- / \ _ \ | |
--- | \| | | B | |
| PNP transistor | | |------|---+ |
| | _/|_| | | |
| \ \| / --- 100 pf |
_ E \/ / --- |
>|_) carbon mic /\________/ | |
| or other | | |
| analog input | L | |
+---------------+-()()()()()()-----------+----------------+
| _ |
| ||/| |
+-------||---------------+
/||
10 -> 365 pf
or fixed
To make L:
|-36t #28 C.T.|
_________________ _
| ||||||||||||||| | |
| ||||||||||||||| | 1/4"
-+------+------+- -
| | |
good luck.
Date: 19 Jul 1996 17:06:49 GMT
Original Subject: Re: Electronic 'bugs', 'recievers', detectors