Here is another great solution to controlling the 5 volts maximum power your ATtiny85 can handle. Servos need 5 volts themselves and this is a great solution. Yes, you can buy a converter such as snapVCC for $13 or wire it up just as shown using a 5 volt regulator and two ceramic capacitors Jameco #334 0.33uF and a Jameco #104 0.1uF for only $1.77? More importantly now you know how it works and you can use this same 9 volt to 5 volt set up for other projects! We are planning on making these to use as test boards when programming ATtiny85/84's or larger microprocessors to test LED patterns. Plus we can set this same board up to test servo angle patterns. We will use this board over and over again. Amazon and Jameco carry these. See my earlier post "What is a Capacitor for?" for more information on how capacitors and here to how 5 volt regulators work.