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Micro Spy with FETs

Copyright 1993 - Tony van Roon

 

T1 & T2 are BF245 N-channel FET's and can be replaced with a NTE133. The ECG312 could likely be used also. The varactor diode BA121 can be replaced with a ECG/NTE611. USW stands for 'Ultra-Short-Wave'. L1 = 7 turns of 0.8mm Silver wire on a 5mm round Ferrit-core (adjustable). This very stable oscillator has a frequency of approximately 100 Mega herz.o Feedback via 16pF capacitor. No interference from antenna on resonance-loop. Distance is at *least* 300 meters!

 

 

 

 

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