The failure mode on your RTTY terminal is similar to that of applying a signal in the threshold region?
to a logic gate:
> Some extremely high powered logic parts (74ASxxx family parts, I'm looking at you) can overheat
> and/or oscillate when an input signal is in the transition region between logic 1 and logic 0.? This is
> why it is good practice to tie unused logic inputs to a solid logic 1 or 0 (typically to ground).
> Many parts have some hysteresis designed into the input buffers, mostly avoiding this issue.
Typically an issue only on really high power parts,
careful design can usually avoid this.
Jerry, KE7ER
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On Thu, May 6, 2021 at 09:31 AM, jerry@... wrote:
IF OTOH you turned the transistor on just a little bit - say because of too low base voltage/current - that poor little transistor would let out its smoke with dispatch.
