Yes.I purchased the .22uf cap. I'm about to solder it to the circuit. Just want to make sure I get this correct. Power wire stays as is to the LM340 input; add the .22uf to LM340 input;and connect the ground to both the .22uf cap and GRD Term of the LM340?
If the capacitor is polarized, make sure that you install it correctly.
Tantalum capacitors have the + lead indicated.
Aluminum electrolytics have the - lead indicated.
Then apply power, and measure the output voltage of the LM340. If it's still around 3v, you'll need another regulator.