As far as constructing a board that's a great idea - one small board per segment. A number of individual segments could be made on a 12" x 12", then chopped up ready for the leds.A compromise would be to make an identical PCB for each segment with mounting holes, then mount them to a cheap board. This would save time and money and allow you to pick the LEDs you want.
Bill, got the PCB working. Advancing digits due to an LED it fed off the "count" inputs. A a "future fault find", I placed an LED on the input that fed directly to the base of a BC547 that gave a pulse to pin 1 of the 4511 to count. What I didn't realize is how sensative the transistor was (showing my lack of knowledge here). I therefore connected the LED pin 1 directly (which is how my breadboard was connected).As a clue, do you have any symptoms? When you say floats, what are you trying to describe?
Yes.Are you using a mock up display to test it out?
So do I use a circuit similar to:You feed the light level you want to change at into either circuit, and adjust the voltage output with the pot to be ½ Vcc.
by Jake Hertz
by Duane Benson
by Duane Benson
by Duane Benson