Crystal Radio Kit

Code: N51FL


1  out of 5 based on 2 reviews
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  • Listen to radio using only the power in the radio waves (batteries not required!)
  • Simple design using a fixed capacitor, ferrite rod antennal and crystal ear piece
  • Supplied with the PCB and components

Product details

Crystal Radio Kit

• Listen to radio using only the power in the radio waves (batteries not required!)
• Simple design using a fixed capacitor, ferrite rod antennal and crystal ear piece
• Supplied with the PCB and components

Reviews

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2 of 2 Reviews

  • I saw the comment by Emyr but thought that this is such a simple kit, I would still give it a try. He was correct! After following the instructions, I got nothing. The coil that is described in the kit did sound a little short being only about 25 turns around the ferrite rod, so I gave it a try with about 70 turns of thinner wire around the ferrite rod. This helped a bit but provided very quiet and distorted audio. This made me think that the detector diode in the kit may have been a silicon diode, so I replaced this with a Germanium OA90 diode from Maplin and this time I got much more clear, undistorted audio and could also select some stations. From this I assume that the number of turns on the coil and also the diode provided are incorrect. If this was adjusted, it would create a kit that had the potential to work first time and would give any kids who attempt it a much greater sense of satisfaction once completed. To make the kit work, wind about 50 to 70 turns of wire on the ferrite rod. I had a reel of thin enamelled copper wire but any thin insulated wire should do (about 4 or 5 meters) Change the diode to an OA90. I used a 1m length of the wire to attach the GND to my cold water tap and the remaining length of wire for the antenna was just streached out. Set it up in a SILENT room and slowly move the ferrite rod in or out of the coil. Doing this should allow you to find a good 3 or 4 stations. Another tip - if it does not work during daylight hours, give it a try once it is dark outside as the radio signal strengths change between day and night. Good Luck.

    Was this review useful?  Yes No  23 1

  • Bought this for my son as his first electronics kit/experience soldering/first radio The kit's instructions were simple and clear, It was easy to build, And my son did a brilliant job, perfect soldering and built with care. After lots of fiddling we didn't get any noise from the radio We tried several earths and took care getting the antennae up cleanly into the air. Nothing, nada. I ran over all the soldering myself later, checked the crystal earpiece (which was fine) and still nothing. A major disappointment.

    Was this review useful?  Yes No  28 1

Questions

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3 of 3 Questions

  • John Kerr said:

    Does the radio receive AM or FM?

    This is just AM.

    Was this answer useful?  Yes No  2 0

  • Alex Welland said:

    Do you need to solder an item on the crystal radio kit?

    Yes, this is a soldering kit.

    Was this answer useful?  Yes No  1 0

  • Blake said:

    How does this kit output sound ? Though an audio jack or is there a speaker connection ?

    The unit includes an earpiece. It has a jack on it which is removed and then the earpiece is soldered directly to the board supplied.

    Was this answer useful?  Yes No  2 0

Bulk Prices

Item code Item name Quantity Price
N51FL Crystal Radio Kit (100+) £7.49
N51FL Crystal Radio Kit (25+) £7.99
N51FL Crystal Radio Kit (10+) £8.49
N51FL Crystal Radio Kit (5+) £8.99
N51FL Crystal Radio Kit (1+) £9.99

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