Dilshan R Jayakody’s Web Log

This project is about a wireless musical call bell, which I designed to meet some of my friend's requirements. This circuit design uses only the 4000 series CMOS logical ICs, NE555 , UM66 , and TDA7233 audio amplifier IC. For the remote control, we use a 433MHz 4-channel remote control module . This circuit is designed to work continuously with a low-power external 5V power supply. Prototype version of wireless call bell. The PCB in this call bell is designed as a single-sided PCB. The dimension of the PCB is 82mm × 50mm.  All the components in this circuit are commonly available through-hole-type components. The whole assembly process of this musical call bell is shown in the video attached to this document. The RF remote control module we use in this project consists of a remote control decoder and encoding IC. In our version, the transmitter (key fob) has a PT2262 encoder, and the receiver has a PT2272 decoder IC. In the prototype build, the receiver and transmitter are confi...

This DIY project happens because of some request of my family members. The ultimate goal of this project is building analog TV antenna to receive UHF and VHF channels with minimum distortion, noise, materials and time. All the building materials of this antenna are available in general electronic shops and hardware stores. I got excellent results from this antenna in my home town: Maharagama ( Colombo , Sri Lanka) with all the locally available VHF and UHF channels. Technical drawing of this antenna is available to download in here .