On 01/03/2012 07:44 PM, Nathan McCorkle wrote:
> ohn this circuit lists a 1.5V trigger, would this be appropriate for
> being driven by a photo-isolated Atmega?
> http://www.discovercircuits.com/PDF-FILES/xenfls1.pdf
The circuit of http://www.discovercircuits.com/PDF-FILES/xenfls1.pdf has a 2.2k resistor
in series with the gate of an SCR. The SCR gate needs some volts, but not too much or it
will be hurt. It does not push back any -- the SCR latches up once it is on until the volts all
go down -- so you can feel your microcontroller GPIO pin is safe. You need to figure the
power dissipation of the pulse going to the SCR gate and keep it in spec for the SCR
so its gate doesn't burn up.
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