I built a single display counter (from CircuitDigest.com) using an IC 555 & IC 4026 along with a few resistors, capacitors, etc. Using a 9VDC supply it works perfectly. I used a small (.56" character height, Vf=1.8) display and I would like to substitute it with a much larger display. I chose one with a character height of 2.25" and a Vf of 6.8. But, of course, it won't work. I need help in determining what changes in the circuit design are necessary so I can use the new 7 segment, common cathode display. (The original circuit can be viewed at: Circuitdigest.com/electronics-circuits/555-timer-seven-segment-counter-circuit) Thanks to anyone who can help me on this home project.
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