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Thank you very much. I appreciate your input. Tom

I cannot find that specification anywhere. All I could find was from http://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/K20P64M72SF1.pdf on page 10 which states: "ID Maximum current single pin limit (applies to all digital pins) –25 25 mA" (min and max) I measured the current draw...

Actually I think I see my folly. I connected the back light pin (BL) to D0 and according to my own comment made above, the back light can draw as much as 50ma. Although the drawing is not updated, supplying VCC on both the TFT and the breakout board with an external 3.3v supply doesn't solve the...

The Teensy was never powered by anything other than the usb port. According to Adafruit "Current draw is based on LED backlight usage: with full backlight draw is ~50mA". The si5351 with 3 outputs enabled is 35ma. This may have been cutting it a little close which is why on the second Teensy 3.1...

That drawing is from before when I was powering the TFT and the si5351 board from the Teensy 3.1. After the first Teensy 3.1 mishap, I supplied them with an external 3.3V. Tom

I'm working on a project that uses a Teensy 3.1, TFT display and an si5351 breakout board. Everything seems to work fine with the encoder changing the frequency and the button(switch) on the encoder changing the tuning steps. Originally, I had the display and the si5351 breakout board powered...