Your cap values are still way too low. Make them 10uF. You can also eliminate R1, R2 and R18 because the 74LS14 has internal 20k pull-up resistors. You will then have a debounce time-constant of 200ms, resulting in the '14 input being held below the upper Schmitt threshold for ~80ms, considerably greater than likely switch bounce duration.
I've no idea what those voltages relate to, but the Vf of a red LED is typically in the range 1.8V-2V. You still haven't said which LEDs you will be using. White LEDs, for example, have a typical Vf > 3V. For a 12V supply, Vf = 2V and 4 LEDs in series the current through them will be ~33mA, which is excessive if typical red LEDs (rated 30mA max) are going to be used.
To blank a leading zero.
Not understood.
Hi Alec, I made the alterations as you mentioned to the design. I thought I already changed the Cap Values, but I may have loaded a previous version or not have saved it.
I posted the LED's I had in mind in my second to last post. They are found at this address:
https://uk.rs-online.com/web/p/visible-leds/4966156/
The data for them is as follows: Dominant Wavelength: 630 nm, Forward Voltage: 2.6 V, LED Colours: Red, Luminous Intensity: 5500 mcd.
What I meant for the 74LS14N, it is only one Unit I require for the board. They just use different pins?