21 Aug
2015
21 Aug
'15
8:40 a.m.
On Fri, Aug 21, 2015 at 8:36 AM, dwight <dkelvey at hotmail.com> 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