380
Item nr.


Watssound 9300 Box radio

Rectangular desk set.


Data for Watssound 9300
ProductionChina, 2008.
BandsMW (530-1600kHz), FM (88-108MHz).
Semi-
conductors
IC HWCAT CSC2003M (Tuner), 3 transistors, IC TDA2822M (audio), 4 diodes (rectifier).
CabinetPlastic. Size 9.5x16x9.5cm. Weight 630gr.
PowerAC 230V/4W or Batt 6xAA.

The Design

The box is relatively easy to open and has several sections inside. The power transformer is locked in a separate part for safety, opened in the picture here. Behind the knobs you find the RF chassis with tuner IC and three transistors. Behind it is a small power PCB with the power supply and output amplifier. To open the radio you don't need to pull the knobs because the tuner PCB remains connected to the front.

Obtained6/2014 from Activiteitenmarkt; sn=080513.
Condition7.
DisposedScrapped 5/2021.
Sound samplePLAY SOUND   Once you succeed to tune an FM station, you'll enjoy a good sound (and Raymond van 't Groenewoud's opinion on Girls).

This Object

The radio was rather dirty, even sticky. More problematic, the AM does not work properly and I have traced this problem down to the power switch. It has two contacts that are connected in FM mode, but not in AM mode. Putting a screw driver over the contacts brings AM to life, so I'm quite sure there should be a connection. Now I'm afraid that to repair this, it would be needed to unsolder the switch from the PCB and open it.

These pictures show the power chassis (left) and the tuner chassis (right).

Transformers are rather expensive to use for supplying transistor radio's, because of the idle draw. The Watssound consumes 2.5W when in use, but 1.0W when switched off. This means that plugging, but not using this radio costs you about 2 euro's per year. I made an experiment to replace the transformer by a small switched mode power supply, which reduced the consumption to 0.1 (off) 0.7W (in FM).


Part of Gerard's Radio Corner.
Generated by SiteBuilder on 13/3/2024 by Gerard (g.tel@uu.nl)