Engineering Projects

A single IC as illustrated in the figure, consist of almost all the active components that an AM receiver constitutes in general cases. However the resonant networks required for the circuit operation, needed to be supplied externally. RF converter, IF amplifier, detector and AGC circuit, a built-in regulator zener diode, and the audio preamplifier stage are the crucial portion of the IC. We can also see in particular AM receiver system ICs, the RF amplifier is included and the tuning meter/ pre-amplifier is omitted completely from the system. Few parameters…

Alarm has today been established as a medium to alert people about the unusual happenings around the territory it is fixed at. This is a common circuit which makes uses of low power components and easily available electronic machinery to serve our purpose. To add more, because of the simplicity of this project, it can be implemented at places we sense the necessity. This IC benefits an individual with the possible list of options to select how s/he wants the alarm circuit to function, which includes necessary set-up for burglar…

Generally, appliance timers offer a wide range of applications with a greater range of flexibility. But here we have presented a typical type of IC as shown in the figure, which can be used with 50/60 Hz power lines and can operate on both 12- or 24-hour basis. A 50 Hz power line requires an external clock input for operation. This clock turns the timer on/off and along with this also sets the minutes and hours limits of the timer. Additional features like ‘reset’ and ‘repeat’ control are added, which…

The IC described here is particularly designed for single audio channels, so as to offer Dolby B-type noise-reduction features. Along with the internal power supply regulator, the circuit of dolby noise reduction processor IC requires a series of amplifiers. In addition to this, some external RC networks are also required for the system. These networks serve a special purpose in the system. A single network comprising five capacitors and three resistors is connected to four external leads. The other network which constitutes of three resistors and three capacitors forms a…

Generally, audio power amplifier  are low frequency (typically 40 Hz to 20,000 Hz) power amplifiers. Internally, they are designed as class B power amplifiers and offer reasonable power gain (5 to 10 watts typically, as well as low distortion figures. To handle the power dissipation required, most chips have several large, flat pins that are tied to ground and act as heat sinks. Chips such as these provide additional features as well, such as thermal shutdown protection, overvoltage protection, and frequency compensation. The output is designed to drive a low…