Trying to make a switch for 9v that is activated by only 1.5v

[LMCI]

Trying to make a switch for 9v that is activated by only 1.5v. I've tried a few transistors that don't work. Is 1.5 volts not enough to activate them? Where can I find one that can?

 

[10kangstroms]

Transistor Question

Are you trying to use a MOSFET? You can do it easily with a BJT. What is the source of your 1.5V, and how much current does the load draw?

 

[LMCI]

Re: Transistor Question

I've got 1.35 volts coming from a cellular phone vibrating motor that needs to switch a 9 volt accessory on when activated. I'm having trouble finding something that will switch at such a low voltage. I appreciate the help.

 

[jwfan]

Transistor Question

Maybe you need a bootstrap circuit to boost up the drive voltage

 

[10kangstroms]

Re: Transistor Question

I've got 1.35 volts coming from a cellular phone vibrating motor that needs to switch a 9 volt accessory on when activated. I'm having trouble finding something that will switch at such a low voltage. I appreciate the help.

I guess I'm paranoid, but I won't tell anyone how to activate something when a cell phone rings.

 

[LMCI]

Re: Transistor Question

Trust me I'm not building an IED. My Dad who is almost deaf can't here his cell phone ring, and I'm trying to make it louder. The phone has such low voltage it can't operate a transistor.

 

[10kangstroms]

Re: Transistor Question

Trust me I'm not building an IED. My Dad who is almost deaf can't here his cell phone ring, and I'm trying to make it louder. The phone has such low voltage it can't operate a transistor.

OK, I'll suspend my paranoia.
What transistors have you tried, and how much current does your load draw? Also - where will the 9V come from?

 

[LMCI]

Re: Transistor Question

I got it. Just needed a smaller transistor. No wonder why the terrorists are having such an easy time with it.

 

[10kangstroms]

Re: Transistor Question

I got it. Just needed a smaller transistor. No wonder why the terrorists are having such an easy time with it.

Please post your Dad's phone number so we can detonate your IED while you are delivering it.

 

[LMCI]

Re: Transistor Question

Its amazing how easy that was. I was in Bali in 2002 and it is incredible the destruction you can do with one of these. Wait till the terrorists in Iraq start spreading their skills through out the world. We are going to see a lot more of these in the future!