Re: info on optocouplers needed
- From: James Arthur <bogusabdsqy@xxxxxxxxxxx>
- Date: Sun, 01 Feb 2009 03:53:12 GMT
whit3rd wrote:
On Jan 30, 3:15 pm, James Arthur <bogusabd...@xxxxxxxxxxx> wrote:
> i use a diode in shunt with the led Or the reverse breakdown
> voltage is related to current also so with 6mA we are ok?
Either in shunt or series, but yes, the protection diode is
needed. 12v reverse will kill the LEDs. Unacceptable.
A resistor-zener-resistor TEE would both reverse protect
and remove the sensitivity to drive voltage. Many very
inexpensive transistors have base-emitter breakdown
that can be useful here (because zeners are more
costly).
Nice idea.
Cheers,
James Arthur
.
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