• 7-segment LED and resistors. For some reason the resistor end needs to be grounded and the common end needs to go to Vcc.
  • MC14543B. There is an enable-like pin (7) which needed to be grounded, and a "phase" pin(6) which needed to go to Vcc, this one seems to invert all the logic.
  • Buttons that go to Vcc when enabled.
  • pull-down resistors, the source of my frustration.
  • Wall wart.

BCD to 7-Segment - Details

Newer Older

This is the only picture that came in focus, but its hard to see that zero is lit up so I kept the other.

7-Segment LED at the left, I was able to figure out the pins on that without too much trouble (couldn't get the comma or top dot to light up though).

The chip in the center is a MC14543B "BCD-to-Seven Segment Latch/Decoder/Driver for Liquid Crystals". All those slashes go a long way towards explaining why this was so difficult for me to setup.

Buttons on the right so that I could test the whole affair. My biggest problem was that these needed a pull-down resistor.

keyboard shortcuts: previous photo next photo L view in light box F favorite < scroll film strip left > scroll film strip right ? show all shortcuts