F
Fred Bloggs
- Jan 1, 1970
- 0
Terry said:Here's my successful result with the 'standard' circuit. I've only
simulated, not breadboarded it, so do you reckon that 'spike' in the
diode variation is real or an artifact of my simulation?
http://www.terrypin.dial.pipex.com/Misc/4013mono1.gif
Fred: I also tried your version, but the simulation failed with error
"Float invalid operation exception". What's the suggested value of the
lower R please? (I arbitrarily tried 1k, 10k and 100k, with same error
message.)
With your timing, a 1M resistor in series with RESET is more than
adequate. Win Hill's claim of that race/noise-prone minimalist circuit
is overstated. It is NOT a 'standard' circuit and my library of
historical logic design goes back further than his. He is basing his
opinion on some non-critical application in a cheap mass-produced gizmo
he reverse engineered. I advise against using that 'thing' of his in any
application that can be disrupted by "runt pulse" behavior. The circuit
is just plain anti-digital, and a little wisp of a few uA of clamp diode
current for any MSI IC is a non-event.