Use DC power supply can prevent overheating to the cheap radio receiver's transformer easily during long duration of radio listening

At the market, we can purchase cheap radio receivers as cheaper as RM 30 per unit, those cheap radio receivers are mostly made in China.

In Malaysia, most of the brands of cheap radio receivers are Leotec (now it was rebadged as Wirata, but Made In Malaysia), Khes, Nippon, JOC etc.

I was used to own Leotec LT-Q1 radio receiver from December 2011 to August 2018, it priced at RM35 when I purchased at a market in Teluk Intan, Perak.

I listened to radio broadcast by using this radio receiver with three different power supply, the AC 220V, DC 4.5V and two unit of D size battery (3.0V).

When I used LEOTEC LT-Q1 radio receiver for the first time and listened to my favorite radio station, I turned on the radio by using AC 220V power source, but my radio receiver got overheating after listening to the radio for more than 30 minutes. Then, I switched to battery source by installing two units of D size battery, the radio receiver was better after listening for more than 2 hours, but it was not enough because battery can run out power for long term use, unless I used alkaline battery. Hence, I went for universal DC power adapter. My former Leotec LT-Q1 radio receiver could last long when I switched to DC power source by connecting with universal DC power adapter.

Overheating and faulty transformers are usually happened on the cheap radio receivers if we use AC 220V power supply, this is because the cheaper radio transformer cannot hold the operation for long duration, also the other factors such as poor ventilation.

To prevent overheating or damage of the transformer, I strongly suggest to use DC power supply, several cheap radio receivers have DC power supply socket by connecting from universal adapter. Personally, listening to the radio on cheap radio receivers by connecting to DC socket with the universal DC adapter would be more reliable than AC 220V power supply.

In addition, there are some cheap radio receivers have frequency harmonic problem. I was used to check them out, those radio receivers or Bluetooth speakers with FM radio like JOC, Havit etc have frequency harmonic when the frequency reached on FM 96.0MHz. The listeners will hear nothing when they tune FM 96.0MHz on these cheaper radio receivers, regardless FM 96.0MHz has radio transmission in their areas or not.

For better radio listening experience, I strongly suggest to buy better quality radio receivers like Panasonic, Sony, Pensonic, Philips, Retekess, TECSUN, Aiwa etc, but if you're listening to the radio with using cheaper radio receivers like Leotec, Wirata, Khes etc, I strongly recommend to use universal DC adapter. When the radio receiver requires 4.5V DC power supply, please set to 4.5V DC power supply on the adapter, then you can switch on the radio.