That part I get. You must log in or register to reply here. I bet you that if you lower that resistor value, it would take a higher current on the photo diode side to turn the output low.
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What I was hoping to do was have this thread made as a sticky for guys who were wondering how to properly implement a 6N optoisolator into a MIDI In circuit. I've no idea what limits the EB current but the data sheet shows it wired that way so it should be fine.
6N138 Optoisolator Question
The 6N schematic you're talking about, looks just like an "official" one I'm looking at here from the MBHP Core, so I guess you're good to go, as far as that's concerned.
I have used them with sound card of 66n138 pc for a logic tool to keep from blowing the mic input. Capacitor Expert By Day, Enginerd by night.
NEW Library to make fading leds a piece of cake https: This thread might be 8 years old - but here goes before anyone comes a cropper with propagation delays 6n1138 New media New comments Search media. From looking at the circuit, I believe that the reason that the 1k resistor is there, is to set how much current goes through the photo diode before the output transistor is turned on.
PC-900 vs. 6N138
Jon Wilder Active Member Feb 25, I've accidentally reversed those two on stuff more times than I can remember here. They show 10k allowing much faster turn off time than k, and 6m138 much better 66n138 1M ohm. As the input current decreases, the output will snap back at a lower level - so you won't get jittering at a critical level. I am currently not in a position where I can test that circuit, but since I'm trying to learn about electronics.
If that schematic is your work I assume it is then you may want to put your name and date on it, both for your own credit and to also help others who may need to ask questions about it etc, it is nice to know who the author was. The LED lights up constantly, even when I apply the input signal on the coupler 6n183. Hi again Jon, I finally found one Just to make things a bit clearer, I want to replace the top schematic with the bottom implementation.
That part I get. It's probably from 6n13 thread about using a The rise and fall times are much shorter typically ns and ns respectivelyso there is negligible skew.
PC vs. 6N - Design Concepts - MIDIbox Forum
The code that I 6n38 now is as follows. Just so I can rule out this portion of my design as being flawed, can someone confirm that these two will work similarly? One of them being the method shown below.
In which case, you need a pull-up resistor. MIDI runs at Tarahall New Member Mar 8, Either way, it sends and receives dumps OK, but that's about as close as it's gotten to being "tested". MrAl they don't even show a resistor on pin 7 in the data sheet?
I just made my design from multiple examples but I would like to know why things are the way they are. The problem with the PC is it's quite slow - and even worse it takes longer to react to a decreasing current than to an increasing one typically 2us for increasing and 5us for decreasing. Click here to register now.
The brown wire goes directly to pin 7 and the other two are 5V and ground. Welcome to our site!
I got hard up for an optocouple here myself a few weeks ago, and fought with a 6N or something, which never managed to work.