I was looking for a simple NOT gate the other day. Something that when a +10 V signal is applied to the i/p, sends 0 V to the output. A 0 V input should return a +10V output, much like in a 7400-series TTL device.
This is the truth table I get from the SV Modular NOT:
CV/V/OCT Up Up Down Down
IN +10V 0V +10V 0V
-----------------------------------
OUT 0V +1.7V -10V -0V
(The “-0V” is how ML Module’s “Volt Meter” reports it.)
I could not use it (without additional modules) because there was no mode where the output switches between +10 and 0 volts. In CV mode the o/p never goes greater than 0V.
The +10 to -10 V is merely changing the polarity (which looks the same on some meters), and (not complaining, just curious by now) what is +1.7 V for? It seems like an arbitrary value, unless there is some other module that expects it that I’m not familiar with. That +1.7 V on the input also appears to be the threshold for switching the output.
Unexpected behaviour makes me nervous, so in the end Stalys’ “8 Not operator” module served my purpose.
I had the VC module, but the INVERT input just complicated planning for me. It sorta turns it into an AND gate?
I just subscribed to Lunetta Modula to try out the CD-4049, and it’s exactly what I was looking for. I probably didn’t find it earlier because I was searching for a “NOT” gate. So many modules assume ambiguous notions of what “invert” means and they dilute the search results.
The CD-4049 even has the Schmitt trigger/hysteresis behaviour of a “real” CMOS hex inverter.
Oddly enough, just last night I was wondering if anybody had created a bunch of modules based on the 7400- or 4000-series logic devices. Your CD-40xx series are just the ticket.
Ooh! “BUTTONS” that latch (or don’t). Yay!
Now that a bit of celebration is over, I’m still wondering (because FOMO) what an output of exactly +1.7V from the SV Modular module is intended for.
As a “high” output it is still too low have any effect on, say, a CD-4049 input.
With nothing connected to the “Invert input”, VC Inverter should just function as a standard logic inverter in that a high at the In should result in a low at the Out and vice-versa.