S
SMS
- Jan 1, 1970
- 0
Several circuits I've seen use an opto-isolator or a transistor between
the 555 output and the triac gate, i.e.
<http://www.circuitstoday.com/wp-content/uploads/2008/03/lamp-flasher12.jpg>
or
<http://www.electro-tech-online.com/images/projects/triac_light_flasher.gif>.
The triac I'm using has a 50mA gate current and the 555 can sink and
source 200mA. The triac will be controlling a non-inductive AC load
where the AC voltage will not exceed 18V (coming from a bicycle dynamo),
so there is no shock hazard here.
Can anyone think of a reason I need that extra component between pin 3
of the 555 and the triac gate? I was just going to put in a current
limiting resistor of 10 ohms or so.
the 555 output and the triac gate, i.e.
<http://www.circuitstoday.com/wp-content/uploads/2008/03/lamp-flasher12.jpg>
or
<http://www.electro-tech-online.com/images/projects/triac_light_flasher.gif>.
The triac I'm using has a 50mA gate current and the 555 can sink and
source 200mA. The triac will be controlling a non-inductive AC load
where the AC voltage will not exceed 18V (coming from a bicycle dynamo),
so there is no shock hazard here.
Can anyone think of a reason I need that extra component between pin 3
of the 555 and the triac gate? I was just going to put in a current
limiting resistor of 10 ohms or so.