• Country
• People's Republic of China

• Manufacturer / Brand
• Hanrongda Electronic Co. Ltd.; Shenzhen

• Year
• 2019 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 349686

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

• Number of Transistors
• 2

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast (BC) and FM or UHF.

• Power type and voltage
• Batteries / addl. power jack / AAA: 2 x 1.5 / DC IN 5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 cm = 1.6 inch

• Power out
• 0.2 W (undistorted)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: FM/AM 2-Band Digital radio HRD-104 - Hanrongda Electronic Co. Ltd.;

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

• Dimensions (WHD)
• 60 x 100 x 15 mm / 2.4 x 3.9 x 0.6 inch

• Notes

• The HanRongDa HRD-104 pocket radio features AM and FM bands, clock, alarm and sleep timer.

  Main features

  • FM: 64 - 108 MHz
    • Sensitivity: 8 uV
  • AM: 522 - 1710 kHz (9 kHz steps), 520 - 1710 kHz (10 kHz steps), selectable
    • Sensitivity: 3mV/m
  • Manual and Automatic tuning
  • 56 Memory pressets
  • USB port for a 5 VDC external power adapter 
  • 3.5 mm jack for stereo earphones (recommended 32 Ohm)

  Brief technical details

  There are at least two chassis versions, featuring two different designs.

  One of them has the PCB with reference "HRD-104B-6958" and uses the AKC6958 DSP chip (IC1)  managed by a MC96F6408AL MCU chip.(IC2).

  The other one covered here has a PCB with reference "HRD-104B 1.0MM-FR4  2022-10-26".

  The design is based around a KT0913L-D4 AM/FM DSP, stereo, with integrated earphones driver, IC (U1). The FM antenna signal is shaped by a RF front-end using a 2SC3356-R25 NPN transistor (Q1). The built-in speaker is driven by a 8002B 2W Class-AB single channel audio amplifier configured in BTL mode, IC (U4).

  The MCU IC (U2) is unmarked.

  The power supply uses a 65Z5 (XC6206P302MR) 3.0V LDO regulator to bring the USB 5V down to acceptable operating levels. A Y2 (SS8550) PNP transistor (Q2) acts as a power switch managed by the MCU. (U2).

   

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

• Other Models

• Here you find 5 models, 5 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hanrongda Electronic Co. Ltd.; Shenzhen