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Micr-Spy with FETs

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  • Nicolae Sfetcu
    o 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
    Message 1 of 1 , Jun 28, 2001
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      Micro-Spy with FETS

      o 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'.
      o L1 = 7 turns of 0.8mm Silverwire on a 5mm round Ferrit-core (adjustable).
      o This very stable oscillator has a frequency of approximately 100 Megaherz.
      o Feedback via 16pF capacitor. No interference from antenna on resonance-loop.
      o Distance is at *least* 300 meters!
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