Trying to find right transistors to use for a project...sal2

Thu May 26, 2005 10:12 pm   

Trying to find right transistors to use for a project...sal2

Greetings, All

I would like to switch on and off 4 of my 4mW pen lasers on and off (in various ways)
using my usb 6008 DAQ device
however I don't have enough current/voltage to power my 4mW pen lasers from my
usb-6008 DAQ device. Here are some Specs that I've measured from my device.
The digital outputs on the DAQ device produce:
5V, and 1mA (they have a 4.7k ohm resistor I can't get to inside)

What I would like to do is connect my 4 digital outputs from my DAQ device to
4 transistors that would switch the power on and off from a 5V dc Power supply.

I'm having issues trying to figure out which Transistors I need. Can anyone give
a little assistance.

Also if you have any other suggestions I'm open to that also. I'm allways
willing to learn something new.


Note:(DAQ) is short for Data Aquisition)

Thanks
sal2

Fri May 27, 2005 12:55 am   

Do a Google search on MC1413. This 16 pin dip should provide you with
everything you need. 5Volts is too high for Laser pens- 3 1.5 volt
batteries=4.5 volts. Use a diode in series in the circuit.

+5V----Diode.....+laser------transistor----common.
This is what I use to drive laser pointers.

Dave

sal_at_spp.net wrote: