amplify current output?

[jeremyR123]

Hi,
Does anyone have advice for how I can amplify a current output for low cost.
Here are the details:
I'd like to use a pulse generator to actuate a solenoid valve. The pulse generator has a variable voltage output (0-20V), and a current output of 0.2 - 0.22 A.
The solenoid valve requires at least 12 V, and at least 0.32 A.

I first thought I might simply be able to use a transistor, but I'm having a difficult time finding the right one.
Does anyone know if this approach might work (and maybe able to recommend a transistor)?
Or have a suggestion for a better approach?

Thanks very much,
Jeremy

[waht]

If the solenoid requires 0.3 amps, you might consider using a small signal transistor like the PN2222A which is rated to handle 0.6 amps.

Here is a possible schematic. The diode will protect the transistor from high voltage spikes coming from the solenoid when it is switched on/off.

http://www.vlearnvshare.com/home/images/articles/NPN-DRIVER1.GIF

[jeremyR123]

Thanks very much! I'll give it a try.