RS-232 Tx / Rx monitoring LEDs?

Charles Anthony at
Fri Aug 21 10:40:43 CDT 2015

On Fri, Aug 21, 2015 at 8:36 AM, dwight <dkelvey at> wrote:

> I was going to add something but it has already been
> said several times.
> I will add that if using a LED on an AC like signal of high voltage,
> one should use a diode.
> I recommend using a shunt diode rather than a series diode when
> high voltages are being dropped by the resistor. It reduces the need
> for a high voltage diode but makes the resistor hotter.
> Some red LEDs glow orange when not protected from 12VAC.
> You can ask how I know.
> Dwight

You can also turn on all of the pretty blues lights in a UV-erasable PROM
by putting it in the PROM burner the wrong way around.

-- Charles

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