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UM66 Melody Generator – First Step for Electronics Hobbyists
UM66 UM66 is a melody generating IC commonly used in calling bell, phone, toys, musical bell in doors, home security alarm systems, burglar alarms etc. It is a three pin IC looks like a transistor. Its first pin is ground, second is VCC and the third is the melody output. Supply voltage that can be given to the IC is in the range of 1.5V- 4.5V. These are CMOS ICs and have very small power consumption. Melody generator will reset when...
Condenser Microphone
Condenser Mic You might know that Condenser means Capacitor, the electronic component which stores electrical energy in the form of electrostatic field. As the name indicates the condenser microphone uses a capacitor to convert sound (pressure variations) to electrical signals. Hence it is also called Electrostatic Microphone. We all know that a capacitance will be created when two parallel plate conductors are separated by a distance. The created capacitance will be directly proportional to the area of the plates and...
Wireless Transmitter and Receiver using ASK RF Module
A wireless radio frequency (RF) transmitter and receiver can be easily made using HT12D Decoder, HT12E Encoder and ASK RF Module. Wireless transmission can be done by using 433Mhz or 315MHz ASK RF Transmitter and Receiver modules. In these modules digital data is represented by different amplitudes of the carrier wave, hence this modulation is known as Amplitude Shift Keying (ASK). Radio Frequency (RF) transmission is more strong and reliable than Infrared (IR) transmission due to following reasons : Radio...
HT12D Decoder IC for Remote Control Systems
HT12D is a 212 series decoder IC (Integrated Circuit) for remote control applications manufactured by Holtek. It is commonly used for radio frequency (RF) wireless applications. By using the paired HT12E encoder and HT12D decoder we can transmit 12 bits of parallel data serially. HT12D simply converts serial data to its input (may be received through RF receiver) to 12 bit parallel data. These 12 bit parallel data is divided in to 8 address bits and 4 data bits. Using...
HT12E Encoder IC for Remote Control Systems
HT12E is a 212 series encoder IC (Integrated Circuit) for remote control applications. It is commonly used for radio frequency (RF) applications. By using the paired HT12E encoder and HT12D decoder we can easily transmit and receive 12 bits of parallel data serially. HT12E simply converts 12 bit parallel data in to serial output which can be transmitted through a RF transmitter. These 12 bit parallel data is divided in to 8 address bits and 4 data bits. By using...
IR Remote Control for Home Appliances
IR Remote Control for controlling home appliances can be easily made using Decade Counter CD4017, 555 Timer and TSOP1738 infrared receiver. By using this circuit you can easily control your home appliances using your TV, DVD Player remote control or using a remote control circuit described here.
Remote Control Receiver Circuit Diagram
IR Remote Control for Home Appliances 2nd and 1st pins of TSOP1738 are used to give power, Vcc and Gnd respectively. 100Ω resistor and 33μF capacitor is to suppress power...
IR Transmitter and Receiver using 555 Timer and TSOP1738
IR Transmitter and Receiver pair can be easily made using 555 Timer, IR LED and TSOP1738 IR Receiver. This can be used for remote controls, burglar alarms etc. TSOP1738 is a very commonly used IR receiver for PCM remote control systems. It has only 3 pins, Vcc, GND and Output. It can be powered using a 5V power supply and its active low output can be directly connected to a microcontroller or microprocessor. It has high immunity against ambient light...