Where could I purchase a 12 volt DC 150ma transformer would prefer in line type as opposed to plug in type thanks
I think what you are after is a 'power supply'. A transformer will change an AC input voltage to different AC output voltage. eg 240 Vac input --> 12Vac output. To get the 12V DC a rectifier needs to be added to the output. You could try Maplins, RS components and others.