Questions tagged [opto-isolator]

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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I cannot get opto-coupler H11L1 to work as MIDI Input

I received my H11L1 opto isolators (yeah) to use for my MIDI input(s). However, I cannot receive anything (and tried various circuits). According to the H11L1 (see datasheet) an example circuit is: ...
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2answers
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Opto-coupled PWM output

I have a circuit with two different ground levels. Using a optocoupler, I want to translate a PWM signal to the new ground level. Does there exist a easier method than the following? (Ideally with ...
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2answers
86 views

Zero Crossing Signal Timing

I have a zero crossing circuit for dimming lamps exactly like the below According to my calculations: \$ I_{R7} = \frac {V}{R} = \frac {3.3}{10k} = 0.33~mA\$. Considering TCMT1109 transfer ratio ...
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4answers
5k views

Opto-coupler output

I am using this circuit for mains detection: The output fluctuates a little but capacitor and resistor values ensure that Output is logic HIGH when 220V mains is present. Once mains is not available, ...
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1answer
8k views

How to drive a relay from ESP8266 gpio

I'm trying to connect an ESP8266 gpio to one of the relay modules (please check the image). As I understand with a very basic background, ESP should be able to trigger this relay modules since all ...
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2answers
443 views

(opto)isolated PISO shift register able to “read” at 24V

I'd like to create an input module for arduino, which should read 64 digital inputs using (chained) PISO shift registers. My system voltage is 24V, so the best way will be any PISO shift register (...
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3answers
272 views

How to transfer 0 V - 5 V across galvanic isolation barrier? [duplicate]

Similar to how optocouplers are used to isolated digital signals, how can an analog signal be transmitted across an isolation barrier? I am looking at a signal between 0 V and 5 V. I want to read the ...