Selasa, 11 Januari 2011

Beranda » SIMPLEST RADIO

SIMPLEST RADIO

Introduction:-

.DONT BE WONDERING HOW COULD I GET SUCH A SIMPLE ONE,JUST OBSERVE THIS CLOSELY THIS IS ENVELOP DETECTOR

The circuit is very simple with only 5 parts, but performs very nicely when used with the right size antenna


Diagram:-

This is the schematic of the Crystal Radio

click on the image for better view...................

Parts:-

Part
Total Qty.
Description
Substitutions
C11Tuning Capacitor (See Notes)
D111N34 Germanium Diode
L11Loopstick Antenna (See Notes)
SPKR11Crystal Earphone
MISC1Wire, Board, Wire For Antenna, Knob For C1


Notes:-

  1. C1 and L1 can be bought, or salvaged from an old AM radio (which is where I got mine). You may need to experiment with the connections on L1 in order to get the best (or any) signal.
  2. You may or may not need the ground connection. I never use it and the radio usually works fine without it.
  3. The bigger the antenna, the more stations you pick up and the louder you hear them. On my radio, I get about 10 stations, 3 of which are very loud in the earphone. Of course, not everyone has room for a 60' antenna...
  4. A 47K resistor in parallel with the earphone will help properly load the detector

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