Jon Wilder
Active Member
Hey guys. I've seen 6N138s hooked up two different ways in a MIDI In circuit -
Method 1 -
**broken link removed**
Method 2 -
**broken link removed**
Is one way better/more desirable than the other?
Also in method 2, I notice that while the 1K limits the emitter base current of the first transistor, there's nothing there to limit the base current of the 2nd one. Is this acceptable due to the fact that the 2nd transistor is only sinking current during the pulse period?
Method 1 -
**broken link removed**
Method 2 -
**broken link removed**
Is one way better/more desirable than the other?
Also in method 2, I notice that while the 1K limits the emitter base current of the first transistor, there's nothing there to limit the base current of the 2nd one. Is this acceptable due to the fact that the 2nd transistor is only sinking current during the pulse period?
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