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The 39 ohms Resistor and the 0.01uF capacitors forma an optional Snubber circuit. When the internal TRIAC is turned on it switches the external TRIAC which in turn controls the AC load. So one input pin of NAND gate will be connected to ground while the other is connected to the PWM signal.īased on the PWM signal the LED will be turned on at particular interval for which the internal TRIAC will also be turned on. The NAND gate connects the Cathode pin of the LED to ground based on a PWM signal from the microcontroller. The voltage source Vcc should be able to provide 15mA through resistor Rin to the Anode pin of the LED. The internal IR LED is connected between pin 1 and pin 2. A typical application circuit diagram to control an ACload using a Microcontroller is shown below MOC3041 is commonly used in AC motor speed control, Light dimmers or other home automation application where AC load is involed. This way the LOAD will not be subjected to peak voltage when switching. A Zero cross detector will monitor for the 0V in output sine wave and turn on the internal TRIAC only during 0V. Since the MOC3041 has built-in Zero crossing detector it is mostly used in switching AC loads. CNY7 Optocoupler, Phototransistor FEATURES Isolation test voltage 5 V RMS A. The TRIAC by itself should not be used to switch loads without an external switch. It contains a light emitting diode optically coupled to a photo-transistor. VEX parts: various for building the grinder including a baseplate, motor &. The TRIAC present inside the MOC3041 can provide upto 1A peak current which is high enough to trigger an external switch. Breadboard/wire/4N25 Optical Isolator and 100 ohm & 4.7K ohm resistors.
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Note: More details can be found at the MOC3041 datasheet which is available for download at the end of this page.Įquivalent for MOC3041: MOC3021 (pin to pin compatible)Īlternatives Opto-couplers: MCT2E (non-Zero transistor), FOD3180 (High-Speed MOSFET), 6N137(Highg-Sped NAND), 4N25Īn opto-isolator like MOC3041 is normally used to control another external switching device like a TRIAC, MOSFET or SCR which in turn will control an AC or DC load.
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Other end of the Triac which is present inside the IC
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One end of the Triac which is present inside the IC When the LED is triggered the TRIAC is also turned on.Īnode pin of the IR LED. Meaning it has a Infra-red Light Emitting Diode (LED) inside it coupled with a TRIAC. The MOC3021 is a Zero-Crossing TRIAC driven Optocoupler.
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