The MCT2E opto coupler is basically a communication protection scheme. The opto coupler provides the galvanic isolation between the sending and the receiving side.
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http://www1.jaycar.com.au/images_uploaded/optocoup.pdf
its a opto coupler. And generaly used for high speed switching.
Purpose: An optocoupler (or optical isolator) uses optics to isolate one circuit from another. The diode in the optical isolator is similar to an LED. The light from this LED controls the gate or base of a transistor. A diode has two terminals, an optocouple will have at least 4. A diode is used to control current flow direction; an optocoupler main purpose is to isolate one circuit from another. etc. etc.
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MCT2E (Monocarboxylate Transporter 2E) and HCN-R200 (a specific type of hyperpolarization-activated cyclic nucleotide-gated channel) serve different functions in cellular physiology. MCT2E is primarily involved in the transport of monocarboxylates like lactate and pyruvate across cell membranes, playing a crucial role in metabolic processes. In contrast, HCN-R200 is a channel that facilitates ion flow, particularly sodium and potassium, contributing to the regulation of neuronal excitability and heart rhythm. Thus, their primary difference lies in their roles: one is a transporter involved in metabolism, while the other is an ion channel influencing electrical signaling.
You can use the 4N25 or the PC817 as a suitable replacement for the 4N27 optocoupler. Both options offer similar electrical characteristics, including isolation voltage and current transfer ratio, making them compatible for most applications. However, it's essential to verify specific parameters such as input/output voltage and current ratings to ensure they meet your circuit's requirements.
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The main purpose of an Opto-isolator is "to prevent high voltages or rapidly changing voltages on one side of the circuit from damaging components or distorting transmissions on the other side.
Look here: http://www.philrees.co.uk/midiplug.htm and, in addition: /\ /\ /\ / ################# \ /\ 1 -|- | | ################# | | ----- 1 | | | ################# | | | 2 -|-----/ ################# \--|------ 2 | | ################# | | 3 -|- | ################# | ----- 3 | | ################# | | 4 -|----------#################---|------ 4 | | ################# | | 5 -|----------#################---|----- 5 | | ################# | | \/ ################# \/ \_ SHIELD _/ Metal shell of DIN Connector MIDI IN : 1- n.c. 4- anode of optocoupler 2- n.c. <<<--- !!!! Different for MIDI OUT 5- cathode of optocoupler 3- n.c. MIDI OUT/THRU: 1- n.c. 4- +5v thru resistor 2- local ground 5- TTL open collector ouput 3- n.c.
An optocoupler provides galvanic isolation between the sending and the receiving side of an information stream. The signal crosses the galvanic isolation by being transmitted by a light emitting diode (or a similar mechanism), and is received by a light-sensitive device such as a photo diode or resistor. Common uses of opto couplers include the trigger system of triacs and thyristors, electronic devices dealing with high voltage and current. In those systems, the opto coupler protects the sensitive control logic and equipment that manages the trigger signals from the high power load path. Other common uses of opto couplers are in computing, where devices need connecting to enable exchange of data and where galvanic isolation is desired to keep both sides decoupled. Fibre optic data cables are also very similar to an opto coupler. A typical opto coupler has a thin galvanic isolation barrier (a think layer of glass or similar plastic material) between the light transmitting and light receiving sides. A fibre optics "cable" works much in the same way, except the isolating (but light-conducting) barrier is a very long fibre of glass (or a similar material).