57611Re: Best transistors for SEs - other sourcing questions in Australia?
- Apr 2, 2008The trigger voltages I mentioned in my last post need to
have around 0.5V added to them
This is the voltage across the PNP's base/emitter junction
when the SE triggers.
So the red LED SE would trigger at around 2V.
--- In firstname.lastname@example.org, "Joseph Charles" <jodicalhon@...> wrote:
> You can use a
> string of normally biased diodes as the trigger if you wish,
> which will give a trigger voltage of around 0.3V - 0.5V
> times the number of diodes. Roughly.
> Or you can use a normally biased standard LED as the trigger.
> A red LED will give a trigger of around 1.7V, I think from
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