Micro-Spy diagram | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Wed, 31 Dec 2014 10:21:11 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 Micro-Spy diagram | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 FETs based Micro-Spy https://electronicscheme.net/fets-based-micro-spy/?utm_source=rss&utm_medium=rss&utm_campaign=fets-based-micro-spy https://electronicscheme.net/fets-based-micro-spy/#respond Tue, 22 Mar 2011 23:12:10 +0000 http://electronicscheme.net/?p=828 This is Micro-Spy circuit which designed using FET components.. Circuit Notes: The FETs, T1 and T2, are BF245 N-channel FET’s model. It can be replaced […]

The post FETs based Micro-Spy first appeared on Electronic Schematic Diagram.]]> This is Micro-Spy circuit which designed using FET components..

micro-spy circuit based FETs

Circuit Notes:

  • The FETs, T1 and T2, are BF245 N-channel FET’s model. It can be replaced with a NTE133 or ECG312. The BA121 varactor diode can be replaced with a ECG/NTE611. USW stands for ‘Ultra-Short-Wave’.
  • The oscillator has a frequency of approximately 100MHz.
  • L1 = 7 turns of 0.8mm Silverwire on a 5mm round Ferrit-core (adjustable).
  • Feedback via 16pF capacitor. No interference from antenna on resonance-loop.
  • Distance is at *least* 300 meters!

Micro-Spy circuit diagram by Tony Van Roon

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