Skip to main content

Principle and Working of Opto Coupler


Opto Coupler

Opto coupler is a solid state component in which light emitter the light path and light detector are all enclosed within the component and cannot be altered externally. Usually infrared emitting diode (IRED) can be used as a light emitter. Photo transistor can be used as a light detector.

Principle:

Here is one way transistor of electrical signal from LED (IRED) to photo transistor without any electrical connection between the input and output circuitry.
The degree foe solation between input and output depends on the kind of material used in the light path and on the distance between the light emitter and signal light detector. If the distance between emitter and detector is greater, then the isolation is better but current transfer ratio of detector to emitter current is lower.

Working:

The fig shows the symbol of Opto coupler. The coupler may be operated as a switch in which cause both the LED and photo transistor are normally OFF. A pulse of current through the LED (IRED) causes the transistor to be switched ON for the duration of the pulse. Operation as a linear coupler is also possible by setting up a bias current in the LED. The signal is then capacitively coupled to the LED and causes it’s to increase or decrease. Thus the photo transistor receives a light signal which increases and decreases, linearly around the constant bias level.

                                                                                               Opto Coupler
Parts:
1.       Anode
2.       Cathode
3.       Collector

4.       emitter

Comments

Popular posts from this blog

NE566 Function Generator Circuit Diagram

The NE566 Function Generator is a Voltage-Controlled Oscillator of exceptional linearity with buf fered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The Oscillator CAN be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity.  FMAX = 1 MHz     WIDE 1000:1 Continuous Sweep Possible  NE566 Function Generator Circuit Diagram Pdf Datasheet  Sourced by : Circuitsstream

TDA2030 complete tone control

At this time I present a series of amplifiers that use IC TDA2030, but this series is equipped with a tone control. Tone controls include Bass, Treebel, and Volume. Power amplifier and tone control has been put together in a single PCB. As well as its power supply circuit was also used as one with the power amp, and tone control. Making it easier in the installation and will look neat. Schematics Layout PCB PCB design This amplifier is a mono amplifier type, can be modif for guitar amplifiers. If not coupled amplifier (mic preamp) then you must deactivated potensio treble and bass, why? because if not using a mic preamp and still maintain potensio treble and bass sound input (input) from the guitar will not or the maximum discharge is not tight on the speakers. So you must deactivated a way to decide which directly connected capacitor with the tone control circuit, and capacitor were connected directly to potensio volume and input jack.

Simple Preamplifier and High to Low impedance Converter Circuit Diagram

This is the Simple Preamplifier and High to Low impedance Converter Circuit Diagram. This circuit matches the very high impedance of ceramic cartridges, unity gain, and low impedance output.  Simple Preamplifier and High to Low impedance Converter Circuit Diagram By `loading` the cartridge with a 2M2 input resistance, the cartridge characteristics are such as to quite closely compensate for the RIAA recording curve. The output from this preamp may be fed to a level pot for mixing. Sourced By: Circuitsproject