SV Modular's NOT gate - the output levels seem odd to me.

Plugins & Modules
#1

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.

#2

Submarine has a ton of logic modules, and their stuff is top notch.

2 Likes
#3

Count Modula: VC Inverter or Lunetta Modula: Hex Inverter will also do what you’re after.

image

1 Like
#4

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. :+1:

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). :heart_eyes: 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.

1 Like
#5

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.