• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Shack (Tandy, Realistic, Micronta); USA

• Year
• 1970 ?

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 336047

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 1

• Semiconductors
• 2SB54

• Main principle
• Crystal or Solid State Detector with Amplifer; 1 AF stage(s)

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Solar- and/or muscle driven, also addl. power jack possible / AA: 1 x 1.5 Volt

• Loudspeaker
• - Is a Headphone or Earphone

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Science Fair Solar Operated Radio in a P-box 28-129 - Radio Shack Tandy, Realistic,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 3.5 x 1.75 x 4.5 inch / 89 x 44 x 114 mm

• Notes

• The Science Fair 28-129 solar operated radio can be powered by sunlight or by strong artificial light.  It can also be operated by a 1.5 volt "AA" cell.  It came complete with a selenium photo cell and earphone.  The radio is a simple crystal detector using a germanium transistor to amplify the audio for the earphone.

  The 28-129 was one of a number of Radio Shack "P-box" kits using a perforated plastic chassis that could withstand direct soldering.

   

• Net weight (2.2 lb = 1 kg)
• 1 lb (1 lb 0 oz) / 0.454 kg

• Price in first year of sale
• 4.95 US$

• Mentioned in
• Radio Shack catalog ad 1970

• Literature/Schematics (1)
• Schematic is included on the instruction sheets

• Author
• Model page created by Rich Post. See "Data change" for further contributors.

• Other Models

• Here you find 1299 models, 1181 with images and 117 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Shack (Tandy, Realistic, Micronta); USA