My parts for my clock finally arrived on Monday, so I have been quite busy prototyping my base-15 design. From this, I have learnt/remembered a few things, and I would like to share them here:
1. TTL 555 timers' rise and fall times sometimes aren't fast enough for 74LS393s. It is best to put the output through a Schmitt Trigger (74LS14) first, so to clean up the edges.
2. 74LS393's reset is high when inactive. You need to ground this pin if you are planning on letting the counter reset itself
3. Some ICs don't like clamping circuits
4. RGB LEDs need to be diffused if you want to use a mixture of colours.
5. Staring directly at non-diffused LEDs hurts the eyes.
No doubt I will learn/remember more things as I go along, but this is just what I learnt in the past two days. Hopefully they'll be no more annoyances.
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