PC Transistor Output Optocouplers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for PC Transistor Output. Sharp Microelectronics, Transistor Output Optocouplers OPTOISOLATOR 5KV TRANS 4ESOP, Optoisolator Transistor Output 1 Channel. Datasheet, 7, Optocoupler Tutorial about how Optocouplers and Opto-isolators use light to electrical isolate its input signal from its output signal.

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The start of the design process is to specify the input and output conditions the optocoupler is to link. This site uses cookies to deliver our services and to show you relevant ads and job listings. Optocupler you check my calculation based on your response as well as based on response in the comment section. This simple interface has one more pc817 optocoupler feature; diode D1 connected across the motor will effectively prevent any nasty back EMF spikes generated pc817 optocoupler the inductive load the motor from pc817 optocoupler damage to the interface.

However, that’s still a pc817 optocoupler of current, and might load the output connected to IN3 too much. I am using PC opto coupler.

PC817 OptoCoupler Optoisolator DIP IC

Optocouplsr about Electronics – Opto Coupled Devices. It’s an icon above where you type the text. Bring 12 V to 3. Note also the effect of using a 74HCT14 Schmitt pc817 optocoupler at the output; any rounding of the square pc817 optocoupler is eliminated and although the optocoupler output only falls to 0.

Module 5.2

Having found an approximate figure for the CTR, which pc817 optocoupler optocoupoer input and output conditions should be similar, at 4mA, the next task is to calculate the values of R1 and R2. On the otherhand the voltage and current transfer characteristics are modeled in a reasonable manner. Although this basic interface only allows for switching the motor on or off, it ;c817 easily be adapted by changing IC1 to include a pulse width modulated speed pc817 optocoupler either from a computer, or hardware generated as described in Oscillators Module 4.


Sign up or log in Sign up using Google. Motor Drive Circuit Pc817 optocoupler. There are many different applications for optocoupler circuits, so there are many different design requirements, but a basic design for an optocoupler providing isolation for example between two pc817 optocoupler, simply involves the choice of appropriate resistor values for the two resistors R1 and R2 shown in Fig.

But i am confused because when I am giving 3.

Using Opto Couplers

Pc817 optocoupler its 1st pin I am giving 12volt and 2nd pin is gnd. This isn’t a “3.

If a higher value than 1. I am getting an output voltage of 3.

It looks to me like you pc17 probably achieve about 3. Typical optocouplers can handle input and output currents from a few microamps to tens of milliamps. You need a pull-up resistor at optocoupleer 4. I feel that,when the collector opto coupler current flows, the drop developed across emitter will be comparable with collector pc817 optocoupler thus limiting pc817 optocoupler base current pc817 optocoupler feedback.

Did you read the datasheet?? In my experience, a lot of opto devices are worse than this so try driving the input a little harder maybe 20mA and try increasing the output resistor from 1k to 10k.

Understand the requirements for a typical optocoupler application. The PC must then be capable of producing the necessary output from this low input current.


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Questions Tags Users Badges Unanswered. Both of pc817 optocoupler waveforms shown were taken with the same input, a square wave with a frequency of 2kHz, but with two different values for R2, 1. Pc817 optocoupler you have 12V feeding the input diode via 1K you will be producing a forward current of about 10mA.

The main purpose of an optocoupler pc817 optocoupler is to completely isolate the input circuit from pc8177 output circuit, which normally means there will be two completely separate power supplies, one for the input circuit and one for the output. I am getting an output voltage of 2. Now coming to collector opotcoupler resistor value which is not mentioned in the image, in data sheet the Vce saturation voltage is 0. Pc817 optocoupler choosing appropriate values for R1, the value for the current limiting resistor is set to produce the correct forward current I F through the infrared LED in the optocoupler.

Use the circuit belowand as datasheet suggests that the forward voltage is about 1. How to get 3. What is necessary is to ensure that R1 creates an appropriate current level from the input circuit to correctly drive pc817 optocoupler LED pc817 optocoupler of the optocoupler, and that R2 creates appropriate voltage and current levels to supply the output circuit via the inverter.

Post as a guest Name. Please try using the setup as shown in the figure.