I've been thinking about why this is working for me so well (apart from the good sound, *wink*): I've dabbled in electronics. I have used breadboards, cables, LEDs, resistors, soldering irons.. but often lacked the patience for such a methodical approach. I also actually don't really want to spend a lot of time in electronics, but I find it relaxing, entertaining and generally enlightening to watch others problem solve. I think you've hit on a format that's akin to watching others play games. And the fact that it all fits in a square on a desk makes it that much more concentrated. Keep them coming, I'll be watching.
Those 4 gates (2x7408, 7404and 7432) can be replaced with an equivalent circuit made by the 4 gates in an 7400 IC. Try to read about logic minimization. Can save you a lot of ICs and traces on a PCB.
20:51 You observe that the chip is warm. The total chip current (typical) is 65mA. You don't mention the resistor values of your LEDs, but assuming all 8 LEDs are on, I suggest a resistor value of at least 320ohms so as not to stress the chip. That keeps things at about 5mA/LED which should be a safe value and sufficient to light them as well.
I happened to use 1K on each LED for this circuit, so it sounds like this should probably be fine. Maybe these particular chips (or these from this particular manufacturer) just run a bit warm or something?
I've been thinking about why this is working for me so well (apart from the good sound, *wink*): I've dabbled in electronics. I have used breadboards, cables, LEDs, resistors, soldering irons.. but often lacked the patience for such a methodical approach. I also actually don't really want to spend a lot of time in electronics, but I find it relaxing, entertaining and generally enlightening to watch others problem solve. I think you've hit on a format that's akin to watching others play games. And the fact that it all fits in a square on a desk makes it that much more concentrated. Keep them coming, I'll be watching.
Glad you're enjoying them! (Plus, I had a good sound coach! 😉)
Those 4 gates (2x7408, 7404and 7432) can be replaced with an equivalent circuit made by the 4 gates in an 7400 IC. Try to read about logic minimization. Can save you a lot of ICs and traces on a PCB.
This is the way to go. Two and gates feeding an or gate is logically equivalent to 3 nand gates. Only one chip.
@@geeko321 yes, and the last NAND gate used as inverter. There you have an 7400 fully used.
Something so satisfying about that level of efficiency.
I found your ic videos like with the 7 segment and all the ic videos so interesting, keep it up!
Glad you liked them!
20:51 You observe that the chip is warm. The total chip current (typical) is 65mA. You don't mention the resistor values of your LEDs, but assuming all 8 LEDs are on, I suggest a resistor value of at least 320ohms so as not to stress the chip. That keeps things at about 5mA/LED which should be a safe value and sufficient to light them as well.
I happened to use 1K on each LED for this circuit, so it sounds like this should probably be fine. Maybe these particular chips (or these from this particular manufacturer) just run a bit warm or something?
@@bigzaphod Right, 1K should be fine. So yeah, maybe they are knockoffs. Could be depending upon where you purchased them from.
Good stuff. I'm wondering if you skipping some of this made it remove part of the debounce mechanism of this circuit.
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