McGreevy_VLF_radio_receiver.pdf

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1、Date: July 29, 2002Sheet 1of 1 Size Document NumberREV B0 RX Frequency Range: 100 Hz - 11 kHz McGreevy VLF Radio Receiver B1 9VS1 POWER +9V +- 2N 3904 +9V +9V R11 10K R7 10K +9V +9V SEC +9V ANTENNA 1-3M WHIP 2N 3819 G DS Q1 Detail R1 1M C1 0.1 C9 100 C10 0.1 Q1 2N3819 C3 0.1 R4 1K 0.0V 3.395V N/CN/C

2、 N/C C5 .0033 .0047 C4 .0033 .0047 C6 0.1 T1 RADIO SHACK 273-1380 Q2 2N3904 R5 33K R6 4.7K C8 0.1 1.13V 5.89V 1.11V 5.81V Q3 2N3904 C10 0.1 R9 33K R10 4.7K J1 Output 0.505V C9 1 uf R12 1.5K C7 1 uf R8 1.5K 0.492V relative to ground. R2 10M R3 220 1.295V Typical ooperating voltages shown, C2 47 pf D1

3、 3.9V D2 3.9V This version sports a 2nd audio amplifier stage at Q3. The output level with this version is sufficient to drive a crystal headphone to a comfortable volume. The crystal headphone is like those used on ye olde crystal radios. A Walkman type headphone is NOT the same thing! Check out Mo

4、user #25CR060. Or use as input to your amplifier. D1/D2 Optional - protects Q1 from nearby lightning T1 is a Radio Shack 1K CT primary to 8 ohm secondary Only 1/2 of primary is used. Secondary is not used. NOTE: Output is microphone level audio. Schematic From: See also: home page See also: www-pw.physics.uiowa.edu/mcgreevy/ C4/C5 values: See text on above web reference Rat Shack part number is 273-1380 Documented by Tom Farrand VLF RECEIVER VLFRX.SCH