Re: What's the best timer chip to pulse multiple pen laser like this http://www.onewithall.net/laser_pulse.gif TIA sal
- From: "Dave" <cheapscatedave@xxxxxxxxx>
- Date: 30 Apr 2005 09:47:54 -0700
Are you using the batteries in the pen or do you want
the power
supplied from another source? To supply external
power this is what I
do:
I usually take these pens apart(they only cost 1$)
and power the pen
from a 5 volt power supply that also powers the timer
and counter.
For the timer I use a 555 and feed it into a counter
and drive a npn
transistor base with a 1K resistor. The emitter is
connected to logic
ground or - and the collector is connected to the -
terminal of the
laser pen. I then use a diode from the +5volts to case
of the laser
pen(caution case of pen is now at +5 volts). 5 volts
will damage the
laser pen therefore 5volts minus the voltage drop from the diode and
the NPN will be the
about same as the 3 batteries.
From the picture in the link you provided it looks a
4017 5 stage 5
STAGE JOHNSON COUNTER will pulse in this sequence.
>Is it possible just to use one IC chip? If so anyone
>have an example
I don't know of a 1 IC solution.
Dave
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