I am trying to use a particular tilt switch which only has 1ma out to control an LED. How would you use a 2N7000 transistor or other gate component to allow the real current 20ma to pass to the LED and not cook the tilt switch? Here is the dsheet:
http://www.components.omron.com/components/web/PDFLIB.nsf/0/F8EBDDB7A51A229C8625730D0076401A/$file/D6BN_0307.pdf.

Battery is 3.7v Also, no matter what solution is found it needs to be very small.

 

The link gives me an error. The question is why a switch can only output 1 mill? Switches usually have contacts capable of more current than that. I suppose this is some kind on contained device? Even without that limitation, you will need to be able to place 10 volts on the 2N7000's gate to switch it.

 

I am trying to use a particular tilt switch which only has 1ma out to control an LED. How would you use a 2N7000 transistor or other gate component to allow the real current 20ma to pass to the LED and not cook the tilt switch? Here is the dsheet:
http://www.components.omron.com/components/web/PDFLIB.nsf/0/F8EBDDB7A51A229C8625730D0076401A/$file/D6BN_0307.pdf.

Battery is 3.7v Also, no matter what solution is found it needs to be very small.

Use a BC108 transistor to drive your led.

 

Beenthere,
Problem with the link is the period at the end.
This worked for me:
http://www.components.omron.com/components/web/PDFLIB.nsf/0/F8EBDDB7A51A229C8625730D0076401A/$file/D6BN_0307.pdf

Use a BC108 transistor to drive your led.

mik3,
That's it?

Mshadow,
The switch is not only limited in current, it's limited in voltage as well. If you get it much over 3.5v @1mA, you'll fry it.

You'll need to limit the voltage across it, as well as the current through it. Not something I can answer in 5 minutes, which is all the time I can spend on it at the moment.

 

mik3,
That's it?

I thought this is obvious from the datasheet.

But Mshadow, you can use a 3.3 Volts voltage regulator like the LM2937 or one you can find easily to drive your switch.Also you can use the same regulator to power your led.

 

Mik3 et al,

Sorry for the pathetically basic question here. Thank you for all of the responses, especially Mik3 and the voltage regulator solution.

Mshadow