An optoelectronic device which combines an optical transmitter and receiver in a single package; commonly used in galvanic-isolated control applications such as power supplies.

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219 views

Driving a 24V isolated load from a 3.3V MCU

I am looking to drive a 12-24V purely resistive load from a 3.3V MCU. I would like to use an opto-isolator to separate the circuits electrically. I've drawn up the following circuit, but I'm not ...
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1answer
151 views

Optocoupler drives a transistor - optocoupler doesn't turn off

This is the circuit which comes from Microchip DALI example app note http://ww1.microchip.com/downloads/en/AppNotes/01465A.pdf Here's the deal. Everything works as expected, if this circuit is ...
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0answers
687 views

Using optoisolator and triac with mcu to switch light on/off--need low power alternative

I'm using the schematic below to control a lamp (light bulb) with a microcontroller and I'm running the mcu (and moc3010) off of AA batteries. I just realized the moc3010 has an LED in it that needs ...
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0answers
39 views

Adding resistor in parallel to digipot

I'm trying to control a device using a digital potentiometer (AD5245S). In my application I can't tie the low-ref of the potentiometer and ground, so I'm using an I2C optical isolator (ISO1541) to ...
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0answers
88 views

Voltage drop problem?

I made a circuit using PC817 optocoupler. On its 1st pin, i gave 3.3v, 2nd pin was ground. 3rd pin was 12v and on 4th pin i used a pull down resistor with resistor ...
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0answers
56 views

How do i write if-else control statements in ngspice? the syntax does not seem to the same as that of pspice

I downloaded a pspice module from the CEL website which includes the command: ...
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0answers
103 views

Optocoupler high side vs low side switch

I have a NPN Darlington Optocoupler that I have been using for low side switching. I was wondering if it would be okay to also use as a high side switch? Optocoupler Datasheet simulate this ...
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0answers
50 views

Driving an optoisolator with a 2N2222?

I'm driving an opto-isolated MOSFET gate driver with a 2n2222 transistor from a 3.3V microcontroller (TI Tiva C, 2-8mA max per pin). The IX3108G that I selected needs 10-16mA to be driven ON. This ...
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186 views

Using an optocoupler to put an AC signal on a DC bias

Expanding from this question Can an opto-isolated input be analog?: Can you use an optocoupler to take an AC signal and attach it to a DC bias? More specifically, can you take something like a 1V ...
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0answers
779 views

Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
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37 views

what is the best way to protect sinking inputs

I have a controller with sinking inputs ( should be grounded to activate) , I will use the system in a noisy environment, I want to protect these inputs from EMI and voltage spikes, what is the best ...
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50 views

220V AC Light Dimming(triac H11AA1, MOC3052-M)?

Could I use triac H11AA1 and MOC3052-M to control 220VAC with arduino? I am new to electronics and I am not sure if that components can handle the voltage... Also could you show me some circuit with ...
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0answers
59 views

How to control AC high voltage with Arduino?

I found this great post: http://majsterkowo.pl/en/how-to-control-any-home-appliance-using-a-tv-remote-and-an-arduino/ and this scheme: ...
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0answers
73 views

How to isolate Data / GND between WS2811 LED IC and MCU

How do you isolate the Data and GND lines between an MCU and a WS2811 LED Driver IC? The W2811 is another system that I will be interfacing and need to maximise protection to this. Bandwidth is not ...
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0answers
39 views

Calculating the resistances of an optoisolator

How to calculate the resistance values of an optocoupler?? The optocoupler used is SFH6156-3. The output collector is being connectd to a 5V supply.A pulldown resistor is also connected to the ...
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0answers
98 views

Converting a Low Side Driver to a High Side Driver

I've run into an issue with a product integration we are performing in which we are taking a device whose I/O is meant to accept high side digital inputs (+24VDC) but needs to be driven by another ...
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0answers
105 views

Driving the floating power MOSFETs

In a battery balancing system, I have four transistors and some of them are floating as you can see in this circuit: There are four battery packs each made of two batteries (Li-Ion) and charged via ...
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0answers
40 views

220v buzzer causing pic to reset

i'm using this circuit to drive an AC 220v buzzer which cause my pic microcontroller to reset (which does not happen using a lamp), i currently use the following set up which helped me with the ...
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0answers
39 views

why is there a dc shift in the output of the opto-isolater?

I have pc817 ...input is 0 to 5 v and the output is 0 to 5v with dc shift. pin 1 and 2 is connected to an arduino with a resister on pin 1 150ohm pin 3 ground and pin 4 resister 150ohm + Vcc 5v.. so ...