Showing posts with label difference. Show all posts
Showing posts with label difference. Show all posts
Wednesday, October 15, 2014
Simple Stereo Indicator Detects L R Signal Difference
This true stereo indicator is different from what we usually find on FM radio receiver, which is usually a pilot tone detector. A stereo broadcast from FM radio station contain pilot tone, but a presence of pilot tone doesn’t necessarily a stereo broadcast signal since a mono FM transmitter ca broadcast pilot tone as well. Since this circuit detect the difference between left and right channel, this circuit can detect a real stereophonic programs.
When there is no difference between R and L input signals, the output A1 and output A2 is at the same potential. That will make a a virtual ground rail at half the supply voltage. Here is the schematic diagram of the circuit. The A1 will supply a negative or positive voltage when A1 detects a difference between R and L input signals with respect to the virtual ground rail.
The C4 will be charged via D2 an C3 via D1. The LED is turned on by the comparator A3/A4 via OR circuit D3/D4. The input signal level should be greater than 100mV to compensate for the drop across D2 or D1. P1 is used to adjust the sensitivity of stereo indicator.
Stereo Indicator Detects L-R Signal Difference Circuit Diagram
Monday, September 8, 2014
Difference between LCD and LED
Difference between LCD and LED :-
LCD is a liquid crystal display and LED is light emitting diode, both LCD and LED TVs or any other Lcds are Liquid crystal display.The basic technology in both of them is same as both type consist of two layers of polarized glass through which liquid crystal allows and blocks light, LED is basically a subset of LCD TVs.
LED Lcds differ from the LCDs in such a way that in LCD fluorescent lights are used while in LEDs light emitting diodes are used, another thing is placement of light on Lcd, fluorescent lights in LCD are always behind the Lcd while light emitting diodes on LEDs are placed either on behind or on corners of the Lcd thats the reason LEDs TV are slimmer than the LCD TVs.
LED TVs provide better and clear picture because of two reasons first LED TVs work with wheel or distint RGB- colors to produce share colors and second, Light emitting diodes can be dimmer which helps in maintaining the colors and sharpness on picture.
LCD is a liquid crystal display and LED is light emitting diode, both LCD and LED TVs or any other Lcds are Liquid crystal display.The basic technology in both of them is same as both type consist of two layers of polarized glass through which liquid crystal allows and blocks light, LED is basically a subset of LCD TVs.
LED Lcds differ from the LCDs in such a way that in LCD fluorescent lights are used while in LEDs light emitting diodes are used, another thing is placement of light on Lcd, fluorescent lights in LCD are always behind the Lcd while light emitting diodes on LEDs are placed either on behind or on corners of the Lcd thats the reason LEDs TV are slimmer than the LCD TVs.
LED TVs provide better and clear picture because of two reasons first LED TVs work with wheel or distint RGB- colors to produce share colors and second, Light emitting diodes can be dimmer which helps in maintaining the colors and sharpness on picture.
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