greets
I'm trying to use a 6N135 opto for a midi input module.
Can you guys take a look at the data sheet and tell me if an input current of 16mA is the minimum current needed to switch transistor on?
http://www.fairchildsemi.com/ds/6N/6N136.pdf
I've used the following schematic but with a 6N135 instead of a 6N138.
I did some testing by connecting a LED between pin 6 and ground. It's on while the input LED is off.
The only way I can get it to go off is if I pulse the input LED (pins 2&3) with a battery pack (ca. 3.5V). If I however I hook it up to a midi output of a midi interface and play some midi files, nothing happens, the test LED stays on.
I've tried many different resistor value but it did not help. I don't know if the 6N135 was a bad choice for this or if I'm overlooking something.
Your help is appreciated
thanks
I'm trying to use a 6N135 opto for a midi input module.
Can you guys take a look at the data sheet and tell me if an input current of 16mA is the minimum current needed to switch transistor on?
http://www.fairchildsemi.com/ds/6N/6N136.pdf
I've used the following schematic but with a 6N135 instead of a 6N138.
I did some testing by connecting a LED between pin 6 and ground. It's on while the input LED is off.
The only way I can get it to go off is if I pulse the input LED (pins 2&3) with a battery pack (ca. 3.5V). If I however I hook it up to a midi output of a midi interface and play some midi files, nothing happens, the test LED stays on.
I've tried many different resistor value but it did not help. I don't know if the 6N135 was a bad choice for this or if I'm overlooking something.
Your help is appreciated
thanks