1. Whistler Receiver

Dual FET Whistler Receiver II (schematic)

The original inspiration for this receiver was a design by G.W. Forgey. The current design incorporates a number of improvements over the first version I built.

• minimize front end overload for lower distortion by using:
  • simple RC RF filter before any active components
  • 60 Hz trap before any active components (very helpful in urban settings!)
• dual FET front end with high gain provides:
  • high input impedance
  • voltage gain of about 100
• low battery drain achieved by using:
  • single, 9-volt battery supply
  • separate power switch for headphone amp (LM386)
  • passive filters (switchable)
• record-out independent of headphone volume
• attention to layout and shielding to minimize feedback problems
• case has integrated camera-tripod mount

Outboard Hum Blanker

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