<div>Hi All,</div>
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<div>Just came across a whole bunch (like 2000) of a Philips 4N35 optocoupler. I've seen these listed in some Sound Blaster to MIDI schematics, so it looks like they're okay for use in MIDI applications. What I'd like to know is, what is really the determining characteristic for a MIDI optocoupler? Speed? The 4N35 has a switching speed of about 3uS, so (1/.000003)/2 = a maximum switching speed of approx. 167kHz right? (divide by 2 because each cycle is two transitions, and 1/3uS to get frequency... right?) Anyway, if this is correct, then this part should be more than fast enough for MIDI. What about current capability? Any other factors to look at when picking an optocoupler?
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<div>By the way, if these things are good for MIDI, I'll sell 'em real cheap since I have so darn many (something like $2 + shipping for a tube of twenty, I have to see how many are in a tube).<br clear="all"></div>
<div>Tim (right?) Servo<br>-- <br>"Imagination is more important than knowledge." - Albert Einstein </div>