• Country
• Japan

• Manufacturer / Brand
• Sansui Electric Co., Ltd.; Tokyo

• Year
• 2021 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 349529

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast, Short Wave plus FM or UHF.

• Details
• HD or solid state memory

• Power type and voltage
• Batteries / addl. power jack / Li-Ion 3.7 / USB 5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 1.5 inch = 3.8 cm

• Power out
• 3 W (unknown quality)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: SANSUI Multi-band Card Radio F23 - Sansui Electric Co., Ltd.;

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

• Dimensions (WHD)
• 124 x 78 x 34 mm / 4.9 x 3.1 x 1.3 inch

• Notes

• The SANSUI F23 portable radio features FM, MW, and SW bands. Additionally it plays MP3 audio files from external devices connected to USB/TF ports.

  Main features

  • FM: 87 - 108 MHz
  • MW: 522 - 1620KHz
  • SW: 2.3 - 22MHz in two ranges
    • SW1: 2.3 - 10 MHz
    • SW2: 10 - 23 MHz
  • Analog like rotary tuning with a round scale dial
  • Pure manual tuning with no memory presets
  • TF port to insert storage devices with MP3 audio files
  • Removable BL-5C3.7V 800 mAh Li-Ion battery, charged via dedicated USB-C port.
    • An undocumented feature issues an audible voice message, alleged in Chinese, everytime the battery is nearly discharged, and then the radio shuts down by itself. 

  Brief technical details

  The PCB assembly reference is "S23-MB-V1.2   2022-07-19"

  The design is based around an unmarked DSP IC (U3), featuring the typical soft mute when scanning stations. A simple RF front-end uses a J8 transistor (Q2)  and a A7 antenna ESD protection diodes. 

  A LTK5128D audio amplifier IC (U2) drives the built-in speaker.

  A TTJA00878 custom Audio Processor by A3 handles the radio/player functions.

  The power supply uses a few additional active devices, like a LTH7 battery charger IC (U5), a 42 2p LDO regulator, a some transistors for switching.

   

• Author
• Model page created by Jose Mesquita. See "Data change" for further contributors.

• Other Models

• Here you find 423 models, 409 with images and 132 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sansui Electric Co., Ltd.; Tokyo