Working of Light Dependent Resistor (LDR)
LDR (Light Dependent Resistor) is one of the most cheapest light sensor and most commonly used in light sensor circuits in open area (e.g. auto switching street lamps). It is made of semiconductor materials and the semiconductor used in this systems are cadmium sulphide, lead sulphide, germanium, silicon and gallium arsenide. The main role of LDR is, when the light increases resistance decreases and when the light decreases resistance...
Breadboard and it’s Uses
Breadboard is mainly used to develop temporary electronic circuits for trial and testing purposes. One of its greatest advantage is that it doesn’t require soldering for connecting the electronic components. All you have to do is to just push the leads of the electronic components straight into the holes. Breadboard has many tiny holes separated by 0.1”. At the top of the breadboard you can find two row’s, each row is...
How IC HT12D works?
ASK RF Receiver receives the data transmitted from ASK RF Transmitter. The input code set to address pins A0-A7 at HT12E should match with the address pins of HT12D. If it is valid, the LED connected to the below circuit (fig 2) will glow and then transmission of data get starts. The positive and negative of the power supply is fed into HT12D via VDD and VSS respectively. Fig. 1 HT12D is a 212 series decoder, most commonly used in...
How IC HT12E Works?
HT12E is a 212 series encoder most commonly used in remote control applications. It contains totally 12 input pins in which 4 pins are used for data/address bits (AD8-AD11) and 8 pins for address bits (A0-A7) for safe transmission of data for security purposes. The unique function of HT12E is to convert 12 bit parallel data inputs into serial data output (pin17) and then it is modulated and transmitted using the RF transmitter module....
How IC CM8870 works as DTMF Receiver?
CM8870 can also be termed as DTMF receiver and it is integrated with both band split filter and decoder function into a single IC 18-pin. The power consumption of the IC is 35mW maximum. BANDSPLIT FILTER – as we have already seen that a single tone is superimposed with two frequencies, one is low and the other is high frequency, to split this two frequency into high group frequency and low group frequency and then it is decoded....
