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1

At 3 MHz rise times should be easy to maintain with the distances involved. In my experience most digital lines need a driver if the fanout is more than 5 or 6, and definitely more than 10. To determine fanout, one needs to know the source current of the driver pin and the sink currents of the receiving pins. The capacitance of the sinks also needs to be ...


0

This is an issue that lies entirely within the Reaper software itself. Its "BPM estimator" algorithm has limited resolution, mainly due to the fact that it makes its estimate over a time interval that is much shorter than 10 minutes(!). It then tries to round its result to a "reasonable" number, such as an integer number of BPM. But as peufeu says, it's ...


2

Sequencer and soundcard clocks come from crystal oscillators. 8.4ms/min is a 140ppm difference in frequency, which is a bit high but not impossible, for example if both use 100ppm accuracy crystals and you get a bit unlucky. It probably depends on temperature too, so if the temperatures of the sequencer and the USB soundcard inside the mixer vary, your "...


5

The only simple way you can detect if a clock is running is if you have a clock to test with. Typically this would take the form of some free-running clock that should always be present. Most FPGAs have an internal oscillator or external clock source used for configuration logic, without which they cannot configure (and so are blank slates). It is typically ...


0

Find a CMOS manual for what you need to learn and avoid. Look for rules on Switch pull-up debounce, Decoupling cap, Shoot-thru and ESD awareness. It won't work without Pullup R's on the Switches. 10K or 100k or so. BCD THumbwheel switches are handier than toggle switches or DIP switches.


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In the end. I needed to tie the equal too pin high on the first comparator in order for any of the comparators to work. Reading through the data sheet, I am not sure how I would have found that information. (Thank you Chris Stratton for suggesting to start small.) As for the ghost pico volts, I am still unsure. I originally used two pole switches so that I ...


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Unless you use absurdly long wires (as in feet or yards of the stuff) to connect up the circuit, no, inductive effects should not be a problem. You're probably thinking of relays, which need an inductance (the relay coil) in order to work. Nixie tubes aren't appreciably inductive. All gas discharge tubes, when they are on, are basically constant-voltage ...


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