Sabtu, 17 November 2012

Active antenna 1 to 20dB, 1-30 MHz range.


Parts List and other components:
 
Semiconductors:
      Q1 = MPF102, JFET. (2N4416, NTE451, ECG451, etc.)
Q2,Q3,Q4 = 2N3904, NPN transistor

Resistors:
All Resistors are 5%, 1/4-watt
    R1 = 1 MegOhm           R5 = 10K
R2,R10 = 22 ohm          R6,R9 = 1K
R3,R11 = 2K2                R7 = 3K3
    R4 = 22K                R8 = 470 ohm

Capacitors (rated at least 16V for a 9V supply):
   C1,C3 = 470pF
C2,C5,C6 = 0.01uF  (10nF/103)
      C4 = 0.001uF (1nF/104)
   C7,C9 = 0.1uF   (100nF/102)
      C8 = 22uF/16V, electrolytic
   
Miscellaneous Parts & Materials:  
  B1 = 9-volt Alkaline battery
  S1 = SPST on-off switch
  J1 = Jack to match (your) receiver cable
ANT1 = Telescoping whip antenna (screw mount), wire, brass rod (about 12")
MISC = PCB materials, enclosure, battery holder, 9V battery snap, etc.

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