Shorting 4.1 in midi interface

Hey, I've got a breadboard going for the 4.1 midi interface example, (just RX1/ pin 0 for now)
when I attach the 5vin-->1uF capacitor-->ground, it winds up shutting down. (and doesn't seem to transmit messages without it)
Advice?
Thanks!
Remi
teensy midi interface.png
 
I hope you do have a multimeter. If so, what does it read at the orange line when the error ocuurs?
Is your 0.1uF capacitor indeed a capacitor?
What does "it winds up shutting down" exactly mean? Teensy runs fine but when you connect the capacitor it stops functioning?
About "and doesn't seem to transmit messages without it": I'm not sure what you mean here. Transmitting MIDI is on pin1.
How do you power the Teensy 4.1? By USB?
A photo will definitely help!

Paul
 
sorry, Rx1 for receiving messages, (and it doesn't receive any yet, but the midi setup does see it before attaching the capacitor between ground and 5VIN)

The teensy is powered by usb,

When I attach the ground to the capacitor, my macbook shows this message, and the multi meter shows no power on any pins.
(and the capacitor is showing .1056uF)


here's a photo of the wiring,
 

Attachments

  • Screen Shot 2024-06-22 at 12.15.51 PM.png
    Screen Shot 2024-06-22 at 12.15.51 PM.png
    68.1 KB · Views: 30
  • teensy wiring jun 22.jpg
    teensy wiring jun 22.jpg
    524.4 KB · Views: 35
Last edited:
Woah! Woah! Slow down there. You're shorting Ground to 5v!!! Remember that the numbered rows on a breadboard are electrically connected. No wonder your Mac ain't liking it. Remove that ground wire next to the cap, and just put the capacitor across pin 5 and pin 8 of the 6N138. But I'd double check ALL your wiring before powering it up again.

There's a good example here of this circuit in breadboard.....
 
Woah! Woah! Slow down there. You're shorting Ground to 5v!!! Remember that the numbered rows on a breadboard are electrically connected. No wonder your Mac ain't liking it. Remove that ground wire next to the cap, and just put the capacitor across pin 5 and pin 8 of the 6N138. But I'd double check ALL your wiring before powering it up again.

There's a good example here of this circuit in breadboard.....
WOOPS.
Sorry guys, I thought I was rested enough not to have the saturday stupids yesterday, but apparently it was an uphill battle.
Thanks for the replies, got it fixed up!
 
Back
Top