• Country
• People's Republic of China

• Manufacturer / Brand
• Shenzen Kingstar Electronics Co., Ltd. (KNSTAR); Shenzhen

• Year
• 2024 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 356421

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.

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / Li-Ion 3.7 / USB 5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5.5 cm = 2.2 inch

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: JOC 3 BAND RADIO FM/AM/SW TG-66 - Shenzen Kingstar Electronics

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

• Dimensions (WHD)
• 68 x 115 x 28 mm / 2.7 x 4.5 x 1.1 inch

• Notes

• The KNSTAR JOC TG-66 pocket radio is offered in two colors, Gold and Black. The identical TG-77 model share the same chassis and it differs only the the case style at the dial area.

  Main features

  • FM: 87 - 108 MHz (Mono audio)
  • AM: 522 - 1620 kHz
  • SW: 5.9 - 18.0 MHz
  • 3.5mm stereo earphone jack (wired as mono)
  • 4 Ohm 3 Watt spekaer
  • 3.7V 500mAh removable Lithium battery, type 14500 (AA size)
  • USB-C 5V charging port

  Brief technical details

  PCB assembly reference: TGK-66 94HB T=1.5mm

  The radio is based on a unmarked DSP tuner chip. Likely it is the same as a Si4825-A10 DSP mono audio tuner (U2), as it uses identical pinout as seen on the PCB circuit. A J8/S9018 NPN transistor is used in the front-end BPF for SW band. AM(MW) band connects directly to the DSP AM input pins. FM BPF connects to the DSP FM input pin.

  A MIX8002D audio ower amplifier (U1) drives the 4 Ohm speaker thru the earphones jack. When inserting stereo earphones, as the jack GND is not connected, the two earphones drivers are driven in series thru a 220R resistor to the output of the audio power amp IC.

  A AXS4054 battery charger (U3) uses the USB-C port to charge the battery.

   

   

   

   

   

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

• Other Models

• Here you find 4 models, 3 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Shenzen Kingstar Electronics Co., Ltd. (KNSTAR); Shenzhen