• Country
• People's Republic of China

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

• Year
• 2024 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 356406

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
• FM Broadcast Band Only

• Details
• Other Combination - see Notes

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

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

• Power out
• 0.28 W (max.)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Pocket Mini Radio with BT Player HRD-205 - Hanrongda Electronic Co. Ltd.;

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

• Dimensions (WHD)
• 44.7 x 93 x 22.6 mm / 1.8 x 3.7 x 0.9 inch

• Notes

• The HRD-205 pocket FM Stereo radio features two-way BT V5.0, 12/24 clock, sleep timer and alarm.

  Main features

  • FM: 87.5 - 108MHz with 50kHz stepping
  • 30 memory presets
  • Manual or automatic search and store
  • BT V5.0 with two-way communication. Either plays audio from an external device, or transmit audio to an external device like earphones. 
  • 3.5mm earphone jack
  • USB-C port to charge the integrated 500mAh Lithium battery

  Brief technical description

  This tiny radio uses a RDA5807FP DSP FM RDS/RBDS Stereo Tuner with integrated volume control and audio driver for 32 Ohm loads (U3) witha J8/S9018 front-end transistor, and a LTK8002D Class-AB audio power amplifier (U6) driving a 6 Ohm 2 Watt speaker as seen in this analysed unit (declared as 4 Ohm 3 Watt).

  A CHSC14B9U by A3 supports the Bluetooth transmission. A CTXC14B5A by A3 manages  the radio.

  A LTH7B/GC4054B does the battery managent. The power supply uses a LB2K/XC6219B332MR 3.3V LDO regulator, and a few switching control transistors, a P14C13 PNP, a  S1/CJ2301 P-MOSFET, a J3Y/S8050 NPN, a Y2/S8550 PN, and a T3/BAV21WS fast HV diode. An hardwired 1000uF/10V cap was connected in parallel with the battery wires.

   

• Net weight (2.2 lb = 1 kg)
• 0.075 kg / 0 lb 2.6 oz (0.165 lb)

• 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